WO2013021971A1 - 有機光電変換素子、およびそれを用いた有機太陽電池 - Google Patents
有機光電変換素子、およびそれを用いた有機太陽電池 Download PDFInfo
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- C07D295/08—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly bound oxygen or sulfur atoms
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Definitions
- the present invention is an organic photoelectric conversion element having a transparent first electrode, a power generation layer containing a p-type organic semiconductor material and an n-type organic semiconductor material, and a second electrode on a transparent substrate
- the power generation layer is a bulk heterojunction type power generation layer containing a p-type organic semiconductor material and an n-type organic semiconductor material, and further a compound represented by the above general formula (I) or (II) (hereinafter referred to as an antioxidant)
- Organic photoelectric conversion that is characterized by containing the above-mentioned compounds in the power generation layer, improving the conversion efficiency by improving the morphology, and at the same time suppressing the short-circuit current (Jsc) attenuation during light irradiation
- Jsc short-circuit current
- the organic photoelectric conversion element 10 has a transparent first electrode 12 on a transparent substrate 11, a power generation layer 14 on the first electrode 12, and a second electrode on the power generation layer 14. 13
- the transparent substrate 11 and the first electrode 12 are transparent, and light used for photoelectric conversion enters from the transparent substrate 11 and the first electrode 12 in FIG. 1 and reaches the power generation layer 14.
- the power generation layer 14 is a layer that converts light energy into electrical energy, and contains a p-type organic semiconductor material and an n-type organic semiconductor material.
- the p-type organic semiconductor material functions relatively as an electron donor (donor), and the n-type organic semiconductor material functions relatively as an electron acceptor.
- the electron donor and the electron acceptor are “an electron donor in which, when light is absorbed, electrons move from the electron donor to the electron acceptor to form a hole-electron pair (charge separation state)”.
- an electron acceptor which does not simply donate or accept electrons like an electrode, but donates or accepts electrons by a photoreaction.
- the generated electric charge is generated between the electron acceptors due to the internal electric field, for example, when the work functions of the first electrode 12 and the second electrode 13 are different, due to the potential difference between the first electrode 12 and the second electrode 13. And the holes pass between the electron donors and are carried to different electrodes, and a photocurrent is detected.
- Figure 2 shows an example of another configuration.
- the first electrode 12 and the first power generation layer 14 ′ are stacked on the substrate 11, the charge recombination layer 15 is stacked, the second power generation layer 16, and then the second electrode 13.
- the tandem configuration can be obtained.
- the second power generation layer 16 may be a layer that absorbs the same spectrum as the absorption spectrum of the first power generation layer 14 ′ or a layer that absorbs a different spectrum, but is preferably a layer that absorbs a different spectrum.
- R 1 represents a substituted or unsubstituted aryl group
- Z 1 and Z 2 each represent a substituted or unsubstituted alkylene group having 1 to 3 carbon atoms.
- the total number of carbon atoms of the alkylene group represented by Z 1 and Z 2 is 3-6.
- A represents an oxygen atom
- NZ 3 represents an oxygen atom
- S (O) n5 represents an alkyl group or an aryl group.
- n5 represents an integer of 0-2.
- Examples of the aryl group represented by R 1 include a phenyl group, a 1-naphthyl group, and a pyridinyl group, and these aryl groups may have a substituent.
- Examples of the substituent include alkyl groups having 1 to 20 carbon atoms (for example, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group, octyl group, dodecyl group, tridecyl group, tetradecyl group).
- acyl having a carbon number of 2 ⁇ 20 (-COR b) group e.g., acetyl group, ethylcarbonyl group, propyl group, pentyl group, a cyclohexyl group, Chi ylcarbonyl group, 2-ethylhexyl group, a dodecyl group, a phenyl group, naphthyl group, pyridyl group, etc.
- acyloxy carbon atoms 2 ⁇ 20 (-OCOR b) group alkylcarbonyloxy group
- alkylcarbonyloxy group e.g., An acetyloxy group, an ethylcarbonyloxy group, a butylcarbonyloxy group, an octylcarbonyloxy group, a dodecylcarbonyloxy group, a tridecylcarbonyloxy group, a phenylcarbonyloxy group
- an amide
- substituents may be further substituted with a substituted or unsubstituted alkyl group or alkoxy group having 1 to 20 carbon atoms, or a substituted or unsubstituted aryl group or aryloxy group having 6 to 20 carbon atoms.
- the substituent is an alkyl group having 1 to 20 carbon atoms.
- a halogen atom an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, a hydroxyalkyl group having 1 to 20 carbon atoms, or an amino group having 0 to 20 carbon atoms is preferable. More preferably, it is an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, or an amino group having 0 to 20 carbon atoms.
- an alkyl group having 1 to 20 carbon atoms for example, methyl group, ethyl group, propyl group, isopropyl group, tert-butyl group, pentyl group, hexyl group, octyl group, dodecyl group, tridecyl group, Tetradecyl group, pentadecyl group, etc.
- cycloalkyl group having 4 to 20 carbon atoms eg, cyclopentyl group, cyclohexyl group, etc.
- alkenyl group having 2 to 20 carbon atoms eg, vinyl group, allyl group, etc.
- carbon number 2 Alkoxy groups such as -20 alkynyl groups (eg, ethynyl group, propargyl group, etc.), aryl groups having 6-20 carbon atoms (eg, phenyl group, 4-dodecyloxyphenyl group, 4- (2-ethylhex
- A represents an oxygen atom, NZ 3 , or S (O) n5 , preferably S (O) n5 .
- the alkyl group represented by Z 3 represents, for example, a linear or branched alkyl group having 1 to 24 carbon atoms
- the aryl group represents, for example, a phenyl group. It may have a substituent.
- the substituent is preferably an alkyl group having 1 to 20 carbon atoms or an alkoxy group.
- n5 represents an integer of 0 to 2, and is preferably 2.
- substituents may be further substituted with a substituted or unsubstituted alkyl group or alkoxy group having 1 to 20 carbon atoms, or a substituted or unsubstituted aryl group or aryloxy group having 6 to 20 carbon atoms.
- the substituent is an alkyl group having 1 to 20 carbon atoms.
- R 2 and R 3 each represents an alkyl group, an alkoxy group, an amino group, a thioether group, an ester group or an alkylcarbonyloxy group. Further, an alkoxy group having 1 to 20 carbon atoms is more preferable.
- M5 and l5 represent an integer of 0 to 4, preferably an integer of 0 to 2, m5 is more preferably 0, and l5 is more preferably 1.
- R 4 represents a hydrogen atom, a substituted or unsubstituted alkyl group or a trialkylsilyl group.
- examples of R 4 include a hydrogen atom, a carbon number of 1 Or an alkyl group having ⁇ 20 (for example, methyl, ethyl, octyl, lauryl, etc.) or a trialkylsilyl group having 1 to 20 carbon atoms (for example, a trimethylsilyl group, dimethylpropylsilyl group, triethylsilyl group, etc.).
- examples of R 5 , R 6 , R 7 , R 8 and R 9 include a hydrogen atom and an alkyl group having 1 to 20 carbon atoms (for example, methyl, ethyl, octyl, lauryl, etc.) ), An alkoxy group having 1 to 20 carbon atoms (for example, methoxy, ethoxy, butyloxy, octyloxy, etc.), an aryl group (for example, phenyl, naphthyl, etc.), an aryloxy group having 6 to 20 carbon atoms (for example, phenoxy, naphthoxy, etc.) Etc.), an alkenyl group having 2 to 20 carbon atoms (for example, octenyl), an alkenyloxy group having 2 to 20 carbon atoms (for example, octenyloxy etc.), an acylamino group having 2 to 20 carbon atoms (for example, acetylamino
- two groups of R 4 to R 9 may be linked to form a substituted or unsubstituted 5- to 6-membered ring (eg, indane, spiroindane, chroman, spirochroman ring, etc.).
- two groups of R 4 to R 9 are linked to form a heterocyclic ring such as oxolane (tetrahydrofuran) or oxane (tetrahydropyran), and the phenyl ring represented by the general formula (II) And condensed form.
- the 5- to 6-membered ring (heterocycle) may further have a substituent.
- substituents examples include an alkyl group having 1 to 20 carbon atoms, an alkoxy group, an aryl group having 6 to 20 carbon atoms, Or they may further form a ring.
- the concept of a substituent that a 5- to 6-membered ring (heterocycle) has is a spiro atom in which the carbon constituting the 5- to 6-membered ring (heterocycle) further forms a ring by sharing the carbon with other rings. Other rings are also included.
- substituent when the 5- to 6-membered ring (heterocycle) has a spiro atom include tetrahydropyran and chroman. Some of these substituents are shared with a 5- to 6-membered ring (heterocycle). Preferred forms of these forms are shown in the following formula (II-1), (II-2) or (II-3).
- R 6 and R 8 are preferably not alkoxy groups.
- the concept of a substituent that a 5- to 6-membered ring has is a ring in which the carbon constituting the 5- to 6-membered ring is a spiro atom that forms a ring by sharing carbon with another ring.
- Examples of the substituent when the 5- to 6-membered ring has a spiro atom include tetrahydropyran, chroman and the like.
- Preferred forms when R 11 and R 13 are linked include the forms of formulas (II-1) to (II-3) of the above general formula (II).
- R 10 to R 13 each independently represents an alkyl group, or R 10 represents an alkyl group, and R 11 and R 13 are linked to form 5 to A six-membered form of the formula (II-1), (II-2), and (II-3).
- R 10 to R 13 examples include alkyl groups having 1 to 20 carbon atoms (eg, methyl, ethyl, octyl, lauryl, etc.).
- the antioxidant by containing the antioxidant having the above structure in the power generation layer, it functions as an oxygen scavenger in which singlet oxygen is quenched, and as a result, durability during light irradiation is excellent.
- the mechanism is unknown, the structure of the cyclic tertiary amine in the general formula (I) and the structure of the cyclic ether in the general formula (II) of the antioxidant efficiently transfers energy from singlet oxygen. It is presumed that the antioxidant consumes energy by fluorescence emission or thermal non-radiation deactivation. Note that the present invention is not limited to this mechanism.
- the solubility parameter can be calculated using the method introduced in Hansen Solubility Parameters A User's Handbook, 2nd Ed (CRC Press).
- solubility parameters of organic compounds can be estimated from their molecular structures. It can be calculated using simulation software that calculates solubility parameters from the SMILE equation, for example, HSPiP (http://www.hansen-solubility.com).
- the solubility parameter used in the present invention can be determined from the so-called Hansen solubility parameter, which is decomposed into a dispersion component ⁇ D, a polarization component ⁇ P, and a hydrogen bond component ⁇ H, using the following equation (1). .
- Hansen solubility parameter which is decomposed into a dispersion component ⁇ D, a polarization component ⁇ P, and a hydrogen bond component ⁇ H, using the following equation (1). .
- Hansen solubility parameter are as follows: HANSEN SOLUBILITY PARAMETERS A User's Handbook Second Edition, Charles M. Demanded based on the theory described in Hansen.
- the antioxidant added to the p-type organic semiconductor material and the n-type organic semiconductor material can be added without significantly impairing the power generation efficiency by selecting the solubility parameter from the preferred range shown above. Particularly in the preferred range of the present invention, it is considered that the addition of the p-type organic semiconductor material can be effectively performed without affecting the crystallinity of the p-type organic semiconductor material because it is more compatible with the n-type organic semiconductor material. . Although the mechanism is unknown, it is speculated that the solubility parameter of the antioxidant exists in the domain of the organic semiconductor closer to the solubility parameter, thereby inhibiting the conversion efficiency even when the antioxidant is added. Is considered to be suppressed.
- Examples of the p-type organic semiconductor material used for the power generation layer (bulk heterojunction layer) of the present invention include various condensed polycyclic aromatic low molecular compounds and conjugated polymers.
- condensed polycyclic aromatic low-molecular compound examples include anthracene, tetracene, pentacene, hexacene, heptacene, chrysene, picene, fluorene, pyrene, peropyrene, perylene, terylene, quaterylene, coronene, ovalene, circumanthracene, bisanthene, zeslen, Compounds such as heptazeslen, pyranthrene, violanthene, isoviolanthene, cacobiphenyl, anthradithiophene, porphyrin, copper phthalocyanine, tetrathiafulvalene (TTF) -tetracyanoquinodimethane (TCNQ) complex, bisethylenetetrathiafulvalene (BEDTTTTF ) -Perchloric acid complexes, and derivatives and precursors thereof.
- TTF tetra
- Examples of the derivative having the above condensed polycycle include WO 03/16599 pamphlet, WO 03/28125 pamphlet, US Pat. No. 6,690,029, JP 2004-107216 A.
- conjugated polymer for example, a polythiophene such as poly-3-hexylthiophene (P3HT) and an oligomer thereof, or a technical group described in Technical Digest of the International PVSEC-17, Fukuoka, Japan, 2007, p1225. Polythiophene, Nature Material, (2006) vol. 5, p328, polythiophene-thienothiophene copolymer, WO200808000664 polythiophene-diketopyrrolopyrrole copolymer, Adv Mater, polythiophene-thiazolothiazole copolymer described in 2007p4160, APPLIED PHYSICS LETTERS vol. 92, p033307 (2008). Amer.
- P3HT poly-3-hexylthiophene
- the present invention is a low band gap polymer having absorption up to a wavelength longer than 650 nm, Adv. Mater. , Vol. 19 (2007) p2295, polythiophene-carbazole-benzothiadiazole copolymer (PCDTBT), Nature Mat. vol. 6 (2007), p497, a polythiophene copolymer such as PCPDTBT is preferable.
- PCDTBT polythiophene-carbazole-benzothiadiazole copolymer
- PCPDTBT polythiophene copolymer
- the n-type organic semiconductor material used for the bulk heterojunction layer of the present invention is not particularly limited.
- fullerenes, octaazaporphyrins, and other p-type organic semiconductor perfluoro compounds perfluoropentacene, perfluorophthalocyanine, etc.
- aromatic carboxylic acid anhydrides such as naphthalenetetracarboxylic acid anhydride, naphthalenetetracarboxylic acid diimide, perylenetetracarboxylic acid anhydride, and perylenetetracarboxylic acid diimide, and polymer compounds containing an imidized product thereof as a skeleton. .
- Fullerene derivatives include fullerene C60, fullerene C70, fullerene C76, fullerene C78, fullerene C84, fullerene C240, fullerene C540, mixed fullerene, fullerene nanotubes, multi-walled nanotubes, single-walled nanotubes, nanohorns (conical), etc.
- PCBM PC 60 BM
- PCBnB phenyl C61-butyric acid-n-butyl ester
- PCBiB -Phenyl C61-butyric acid-isobutyl ester
- PCBH Adv. Mater. , Vol.
- fullerene derivative having a substituent and having improved solubility such as fullerene having an ether group.
- the organic photoelectric conversion element according to the present invention has at least a transparent first electrode (hereinafter also referred to as a transparent electrode) and a second electrode (hereinafter also referred to as a counter electrode). Further, when a tandem configuration is adopted, the tandem configuration can be achieved by using an intermediate electrode.
- a transparent first electrode hereinafter also referred to as a transparent electrode
- a second electrode hereinafter also referred to as a counter electrode
- the hole transport layer is formed between the first electrode and the power generation layer as described above because of the configuration in which holes are mainly extracted from the carriers composed of holes and electrons. It is preferable to have.
- the second electrode is a cathode, it is preferable to have an electron transport layer between the second electrode and the power generation layer because of the configuration in which electrons are mainly extracted.
- Transparent electrode As the transparent electrode in the organic photoelectric conversion element, a material using an electrode substance of a metal, an alloy, an electrically conductive compound and a mixture thereof is preferably used.
- transparent means that the transmittance is 80% or more for visible light having a wavelength of 550 nm.
- compositions with shallow work function include sodium, sodium-potassium alloy, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, aluminum / aluminum oxide (Al 2 O 3 ) mixture , Indium, lithium / aluminum mixture, rare-earth metal, etc.
- an ultra-thin film such as gold, silver, or platinum, or a nanoparticle / nanowire layer thereof, a conductive metal oxide material such as indium tin oxide (ITO), SnO 2 , or ZnO, And conductive polymers.
- a material such as IDIXO (In 2 O 3 —ZnO) that can form an amorphous light-transmitting conductive film may be used.
- the auxiliary electrode is preferably a metal from the viewpoint of good conductivity, and examples of the metal material include gold, silver, copper, iron, nickel, and chromium.
- the metal of the conductive part may be an alloy, and the metal layer may be a single layer or multiple layers.
- the shape of the auxiliary electrode is not particularly limited, but, for example, the conductive portion has a stripe shape, a mesh shape, or a random mesh shape.
- a metal layer can be formed on the entire surface of the substrate and can be formed by a known photolithography method.
- a conductor layer is formed on the entire surface of the substrate using one or more physical or chemical forming methods such as vapor deposition, sputtering, plating, etc., or a metal foil is applied to the substrate with an adhesive. After laminating, it can be processed into a desired stripe shape or mesh shape by etching using a known photolithography method.
- a method of printing an ink containing metal fine particles in a desired shape by various printing methods such as screen printing, flexographic printing, gravure printing, or an ink jet method, and a variety of similar catalytic inks that can be plated are used.
- a method of applying a silver halide photographic technique can be used as a method of applying a desired shape by a printing method and then plating, and as another method.
- the method of printing ink containing metal fine particles in a desired shape by various printing methods can be manufactured in a simple process, so that it is possible to reduce the entrainment of foreign matters that may cause leakage at the time of manufacture. Since ink is used only at the location, there is little liquid loss, and since no special chemical is required, there is no concern about contamination of chemicals that cannot be removed, so this is the most preferred embodiment in the present invention. .
- the sheet resistance of the transparent electrode is preferably several hundred ⁇ / ⁇ or less, more preferably 50 ⁇ / ⁇ , and further preferably 15 ⁇ / ⁇ or less. Further, although the film thickness depends on the material, it is usually selected from the viewpoint of transmittance / resistance in the range of 10 to 1000 nm, preferably 100 to 200 nm.
- an auxiliary electrode when provided, it is preferably 10 ⁇ / ⁇ or less, more preferably 0.01 to 8 ⁇ / ⁇ .
- the sheet resistance is determined by the shape (line width, height, pitch, shape) of the auxiliary electrode, and in the case of a material having a higher resistance than the auxiliary electrode, the resistance of the window portion is hardly affected.
- Counter electrode a metal, an alloy, an electrically conductive compound and a mixture thereof are preferably used.
- metals and the like do not need to be thin films, and there are no particular limitations on the film thickness and composition as long as desired electrical conductivity can be obtained. Further, it is preferable to select a material having an optimum work function according to the charge transport layer in contact therewith. As a specific material, the same material as the example mentioned in the above-mentioned transparent electrode can be used.
- a material having a shallower work function is selected from the above-described materials so that electrons can be efficiently extracted.
- Charge transport layer hole transport layer, electron transport layer>
- the original function of the charge transport layer is to serve as a blocking layer that transports only holes or electrons generated in the power generation layer to the electrode and prevents transport of the opposite carrier.
- the hole transport layer can be referred to as an electron blocking layer, and the electron transport layer as a hole blocking layer.
- the electron blocking layer has a function of a hole transport layer in a broad sense. More specifically, the electron blocking layer is made of a material that has a function of transporting holes and has an extremely small ability to transport electrons, and transports holes. However, the probability of recombination of electrons and holes can be improved by blocking electrons. Moreover, the structure of the positive hole transport layer mentioned later can be used as an electron blocking layer as needed.
- the dry film thickness of the charge transport layer of the present invention is preferably 5 to 2000 nm.
- the charge transport layer (for example, 18 in FIG. 1) on the electrode formation side later preferably has a thickness of 50 nm or more from the viewpoint of suppressing damage during electrode formation, and is 100 nm or more from the viewpoint of further improving the leak prevention effect.
- the film thickness is Moreover, it is more preferable that it is a film thickness of 1000 nm or less from a viewpoint of maintaining high transmittance
- the charge transport layer on the substrate side (for example, 12 in FIG. 1) preferably has a thickness of 200 nm or less, more preferably 3 to 100 nm, and further preferably 5 to 100 nm from the viewpoint of film resistance and light transmittance. Is most preferred.
- the hole transport layer contains a hole transport material having a function of transporting holes, and in a broad sense, a hole injection layer and an electron blocking layer are also included in the hole transport layer.
- the hole transport layer can be provided as a single layer or a plurality of layers.
- the hole transport material has either hole injection or transport or electron barrier properties, and may be either organic or inorganic.
- triazole derivatives oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives and pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives, Stilbene derivatives, silazane derivatives, aniline copolymers, conductive polymer oligomers, especially thiophene oligomers such as poly (3,4-ethylenedioxythiophene (PEDOT), poly (4-styrenesulfonic acid) (PSS), etc. Styrene oligomers, or mixtures thereof.
- the above-mentioned materials can be used as the hole transport material, but it is preferable to use a porphyrin compound, an aromatic tertiary amine compound and a styrylamine compound, particularly an aromatic tertiary amine compound.
- JP-A-11-251067 J. Org. Huang et. al. A so-called p-type hole transport material described in a book (Applied Physics Letters 80 (2002), p. 139) can also be used.
- metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum (Alq 3 ), tris (5,7-dichloro-8-quinolinol) aluminum, tris (5,7-dibromo-8-quinolinol) Aluminum, tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum, bis (8-quinolinol) zinc (Znq), etc.
- Mg Metal complexes replaced with Cu, Ca, Sn, Ga, or Pb can also be used as electron transport materials.
- metal-free or metal phthalocyanine or those having terminal ends substituted with an alkyl group or a sulfonic acid group can be preferably used as the electron transporting material.
- inorganic semiconductors such as n-type-Si and n-type-SiC can also be used as the electron transport material.
- an electron transport layer having a high n property doped with impurities examples thereof include JP-A-4-297076, JP-A-10-270172, JP-A-2000-196140, 2001-102175, J.A. Appl. Phys. 95, 5773 (2004), and the like.
- n-type conductive inorganic oxides titanium oxide, zinc oxide, etc.
- titanium oxide titanium oxide, zinc oxide, etc.
- the intermediate electrode material required in the case of the tandem structure is preferably a layer using a compound having both transparency and conductivity, and the materials (ITO, AZO, FTO, etc.) used in the transparent electrode , Transparent metal oxides such as titanium oxide, very thin metal layers such as Ag, Al, Au, or layers containing nanoparticles / nanowires, conductive polymer materials such as PEDOT: PSS, polyaniline, etc.) Can do.
- Transparent metal oxides such as titanium oxide, very thin metal layers such as Ag, Al, Au, or layers containing nanoparticles / nanowires, conductive polymer materials such as PEDOT: PSS, polyaniline, etc.
- the condensing layer for example, it is processed so as to provide a structure on the microlens array on the sunlight receiving side of the support substrate, or the amount of light received from a specific direction is increased by combining with a so-called condensing sheet. Conversely, the incident angle dependency of sunlight can be reduced.
- an element is formed on a pair of comb-shaped electrodes instead of the sandwiched structure between the first electrode and the second electrode as shown in FIG.
- the back contact type organic photoelectric conversion element can also be configured.
- the entire device may be sealed with two substrates with a barrier, and preferably a moisture getter, oxygen getter, etc. are enclosed. Is more preferred in the present invention.
- PCDTBT polythiophene-carbazole-benzothiadiazole copolymer
- Example 1 [Production of Organic Photoelectric Conversion Device SC-101] Glass substrate ⁇ BR> SOPNO, indium tin oxide (ITO) transparent conductive film deposited 150nm thick (sheet resistance 10 ⁇ / ⁇ ) is patterned to 20mm width using normal photolithography technology and wet etching A first electrode was formed. The patterned first electrode was washed in the order of ultrasonic cleaning with a surfactant and ultrapure water, followed by ultrasonic cleaning with ultrapure water, dried with nitrogen blow, and finally subjected to ultraviolet ozone cleaning.
- ITO indium tin oxide
- a liquid containing 1 part of PEDOT-PSS (Clevios P 4083, HC Starck Co., Ltd.) composed of a conductive polymer and a polyanion, and 2 parts of isomalogen (0.1% by mass) made by Kao Chemical Co., Ltd. and isopropanol was applied and dried so as to have a dry film thickness of about 100 nm, followed by heat treatment at 120 ° C. for 10 minutes to form a hole transport layer. .
- the substrate on which the series of functional layers has been formed is moved into a vacuum deposition apparatus chamber, the inside of the vacuum deposition apparatus is depressurized to 1 ⁇ 10 ⁇ 4 Pa or less, and then the deposition rate is 1.0 nm / second.
- a second electrode was formed by laminating 200 nm of Ag metal.
- the obtained organic photoelectric conversion element SC-101 is moved to a nitrogen chamber and sealed with a sealing cavity glass and a UV curable resin, and the light receiving part has an organic photoelectric conversion element SC- of about 5 ⁇ 20 mm size. 101 was produced.
- the organic photoelectric conversion element SC was manufactured in the same manner as in the preparation of SC-101 except that 0.3% by mass of the compound represented by Compound E was added as an antioxidant in the formation of the power generation layer of the organic photoelectric conversion element SC-101. -102 was produced.
- Table 1 shows the calculated solubility parameters of each antioxidant.
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Abstract
Description
図1は、本発明の有機光電変換素子の構成の例を示す概略断面図である。
本発明は、発電層が、p型有機半導体材料とn型有機半導体材料とを含有するバルクヘテロジャンクション型の発電層であり、更には上記一般式(I)または(II)で表わされる化合物(以下、酸化防止剤とも呼ぶ)を含有することを特徴とする。本発明で好ましく用いることができる酸化防止剤の具体例を例示するが、同様な効果が得られる化合物であればこれらに限定されない。本発明では、発電層が、酸化防止剤として、一般式(I)または(II)で表される化合物を含むことで、一重項酸素が消光される酸素スカベンジャ―としての機能を発揮する。
上記のR1で表されるアリール基の置換基と同様のものが採用されうる。
本発明で好ましく用いることが出来る酸化防止剤は、19~23の範囲である溶解性パラメータ(SP値)を有することが好ましい。なお、本願において、「溶解度パラメータ値(SP)値」とは、Hansenによって提唱された理論であり、2成分以上の成分の相溶性の目安となるものであり、そのもののパラメータ値は分子間力を表す尺度として示される。従って、SP値の高いものは水などの極性化合物が挙げられ、SP値が低いものは疎水性化合物が挙げられる。
本発明の発電層(バルクヘテロジャンクション層)に用いられるp型有機半導体材料としては、種々の縮合多環芳香族低分子化合物や共役系ポリマーが挙げられる。
本発明のバルクヘテロジャンクション層に用いられるn型有機半導体材料としては、特に限定されないが、例えば、フラーレン、オクタアザポルフィリン等、p型有機半導体のパーフルオロ体(パーフルオロペンタセンやパーフルオロフタロシアニン等)、ナフタレンテトラカルボン酸無水物、ナフタレンテトラカルボン酸ジイミド、ペリレンテトラカルボン酸無水物、ペリレンテトラカルボン酸ジイミド等の芳香族カルボン酸無水物やそのイミド化物を骨格として含む高分子化合物等を挙げることができる。
本発明に関わる有機光電変換素子においては、少なくとも透明な第一の電極(以下、透明電極ともいう)と第二の電極(以下、対電極ともいう)とを有する。また、タンデム構成をとる場合には中間電極を用いることでタンデム構成を達成することができる。以下に好ましい透明電極、及び対電極の構成について述べる。
有機光電変換素子における透明電極としては、金属、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが好ましく用いられる。ここで「透明」とは、波長550nmの可視光線に対して80%以上の透過率を示すことを意味する。
一方、対電極も同様に、金属、合金、電気伝導性化合物及びこれらの混合物を電極物質とするものが好ましく用いられる。但し、金属類などは薄膜である必要はなく、所望の電気伝導度が得られれば特に膜厚や組成に制限はない。また、接する電荷輸送層に応じて最適な仕事関数の材料を選択することが好ましい。具体的な材料としては、上述の透明電極で挙げた例と同様な材料を用いることができる。
電荷輸送層の本来の機能として、発電層で発生した正孔または電子のみを電極まで輸送し、反対のキャリアの輸送を阻止する阻止層としての役割がある。この場合、正孔輸送層を電子阻止層、電子輸送層を正孔阻止層と言い換えることができる。
正孔輸送層とは正孔を輸送する機能を有する正孔輸送材料を含有し、広い意味で正孔注入層、電子阻止層も正孔輸送層に含まれる。正孔輸送層は単層または複数層設けることができる。
電子輸送層とは電子を輸送する機能を有する材料を含有し、広い意味で電子注入層、正孔阻止層も電子輸送層に含まれる。電子輸送層は単層または複数層設けることができる。
また、タンデム構成の場合に必要となる中間電極の材料としては、透明性と導電性を併せ持つ化合物を用いた層であることが好ましく、前記透明電極で用いたような材料(ITO、AZO、FTO、酸化チタン等の透明金属酸化物、Ag、Al、Au等の非常に薄い金属層またはナノ粒子・ナノワイヤーを含有する層、PEDOT:PSS、ポリアニリン等の導電性高分子材料等)を用いることができる。
本発明における透明基板はこの光電変換される光を透過させることが可能な、即ちこの光電変換すべき光の波長に対して透明な部材である。ここで透明とは、波長550nmの可視光線に対して80%以上の透過率を示すことを意味する。
本発明の有機光電変換素子は、太陽光のより効率的な受光を目的として、各種の光学機能層を有していて良い。光学機能層としては、たとえば、反射防止膜、マイクロレンズアレイ等の集光層、陰極で反射した光を散乱させて再度発電層に入射させることができるような光拡散層などを設けても良い。
電子受容体と電子供与体とが混合された発電層、および輸送層・電極の形成方法としては、蒸着法、塗布法(キャスト法、スピンコート法を含む)等を例示することができる。このうち、発電層の形成方法としては、蒸着法、塗布法(キャスト法、スピンコート法を含む)等を例示することができる。このうち、前述の正孔と電子が電荷分離する界面の面積を増大させ、高い光電変換効率を有する素子を作製するためには、塗布法が好ましい。
また塗布法は、製造速度にも優れている。
太陽光利用率(光電変換効率)の向上を目的として、図1に示されるような第1の電極および第2の電極間でサンドイッチした構造に替わり、一対の櫛歯状電極上に素子を形成させたバックコンタクト型の有機光電変換素子が構成とすることもできる。
本発明に係る電極、発電層、正孔輸送層、電子輸送層、ブロック層等をパターニングする方法やプロセスには特に制限はなく、公知の手法を適宜適用することができる。
作製した有機光電変換素子が大気中の酸素、水分等で劣化しないために、公知の手法によって封止することが好ましい。例えば、アルミまたはガラスでできたキャップを接着剤によって接着することによって封止する手法、アルミニウム、酸化ケイ素、酸化アルミニウム等のガスバリア層が形成されたプラスチックフィルムと有機光電変換素子上を接着剤で貼合する手法、ガスバリア性の高い有機高分子材料(ポリビニルアルコール等)をコートする方法、ガスバリア性の高い無機薄膜(酸化ケイ素、酸化アルミニウム等)または有機膜(パリレン等)を真空下で堆積する方法、及びこれらを複合的に積層する方法等を挙げることができる。
p型有機半導体材料として、ポリチオフェン-カルバゾール-ベンゾチアジアゾール共重合体(PCDTBT)を、Adv.Mater.,vol.19(2007)p2295に従いモノマー合成および重合した。ソックスレー抽出により精製し、数平均分子量Mnが35,000、PDIが2.0のp型有機半導体材料PCDTBTを得た。当該PCDTBTの溶解性パラメータは18.5であった。
〔有機光電変換素子SC-101の作製〕
ガラス基板・BR>繧ノ、インジウム・スズ酸化物(ITO)透明導電膜を150nm堆積したもの(シート抵抗10Ω/□)を、通常のフォトリソグラフィ技術と湿式エッチングとを用いて20mm幅にパターニングし第1の電極を形成した。パターン形成した第1の電極を、界面活性剤と超純水による超音波洗浄、超純水による超音波洗浄の順で洗浄後、窒素ブローで乾燥させ、最後に紫外線オゾン洗浄を行った。
前記有機光電変換素子SC-101の発電層の製膜において、酸化防止剤として化合物Eで表わされる化合物を0.3質量%添加した以外はSC-101の作製と同様にして有機光電変換素子SC-102を作製した。
前記有機光電変換素子SC-101の発電層の製膜において、酸化防止剤として化合物Eに代わり、表1に示す酸化防止剤種を0.3質量%添加した以外はSC-101の作製と同様にして有機光電変換素子SC-103~SC-119を作製した。
上記作製した光電変換素子について、ソーラーシミュレーター(AM1.5Gフィルタ)の100mW/cm2の強度の光を照射し、有効面積を1cm2にしたマスクを受光部に重ね、I-V特性を評価することで、短絡電流密度Jsc(mA/cm2)、開放電圧Voc(V)及びフィルファクターFFを求めた。また、光電変換効率ηを式2より求め、結果を表2に示した。
《素子寿命の評価》
上記作製した光電変換素子について、85℃ホットプレート上において、2波長タイプの白色LED(東芝製小型SMD)を光源に用い、上記素子性能の評価で測定した短絡電流密度Jscとほぼ同値(約1Sun)になるようLEDの光量を調整し、1000時間光照射後の短絡電流密度Jscを上記素子性能の評価に従って測定し、初期Jscに対する劣化後のJsc比を求め同じく表2に示した。
11 透明基板
12 透明な第一の電極
13 第二の電極
14 発電層
14’ 第一の発電層
15 電荷再結合層
16 第二の発電層
17 正孔輸送層
18 電子輸送層
Claims (4)
- 透明基板上に、透明な第一の電極、p型有機半導体材料とn型有機半導体材料とを含有する発電層、および第二の電極を有する有機光電変換素子であって、該発電層が、p型有機半導体材料とn型有機半導体材料とを含有するバルクヘテロジャンクション型の発電層であり、更には下記一般式(I)または(II)で表される化合物を含有する、有機光電変換素子。
〔式中、R1は、置換または非置換のアリール基を表し、Z1及びZ2は、それぞれ、置換または非置換の炭素数1~3のアルキレン基を表す。但し、Z1及びZ2で表されるアルキレン基の炭素数の総和は3~6である。Aは、酸素原子、N-Z3、S(O)n5を表し、Z3はアルキル基またはアリール基を表す。n5は0~2の整数を表す。〕
〔式中、R4は水素原子、または置換もしくは非置換のアルキル基もしくはトリアルキルシリル基を表し、R5、R6、R7、R8及びR9は、それぞれ、水素原子、または、置換もしくは非置換の、アルキル基、アルコキシ基、アリール基、アリールオキシ基、アルケニル基、アルケニルオキシ基、アシルアミノ基、ハロゲン原子、アルキルチオ基、アリールチオ基、アルコキシカルボニル基、アシルオキシ基、アシル基、スルホンアミド基、トリアルキルシリル基、複素環、縮合環もしくはこれらの組み合わせを表す。R4~R9のうちの二つの基が連結して、置換または非置換の5~6員環を形成しても良い。〕 - 前記一般式(I)が下記一般式(I-A)~(I-E)のいずれか1つで表される、請求項1に記載の有機光電変換素子。
(式中、R2及びR3は、ハロゲン原子、または置換もしくは非置換のアルキル基(-Ra)、ヒドロキシアルキル基(-Ra(OH))、アルコキシ基(-ORa)、アリールオキシ基(-SRa)、アミノ基(-NH2、-NHRa、-N(Ra)2)、チオエーテル(-SRa)基、エステル基、-CORa、-COORa、-NHCORa、-NHCOORa、-NHSO2Raもしくはアルキルカルボニルオキシ(-OCORa)基を表し、この際、Raは、置換または非置換の炭素数1~20のアルキル基または炭素数6~20のアリール基であり、m5及びl5は0~4の整数を表す。) - 請求項1~3のいずれか1項に記載の一般式で示される化合物の溶解性パラメータ(SP値)が19~23である請求項1~3のいずれか1項に記載の有機光電変換素子を有する、有機太陽電池。
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| US14/237,850 US9871216B2 (en) | 2011-08-09 | 2012-08-06 | Organic photoelectric conversion element and organic solar cell using the same |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2744005A1 (en) | 2014-06-18 |
| JP5928469B2 (ja) | 2016-06-01 |
| EP2744005B1 (en) | 2016-07-13 |
| JPWO2013021971A1 (ja) | 2015-03-05 |
| EP2744005A4 (en) | 2015-04-15 |
| US9871216B2 (en) | 2018-01-16 |
| US20140190566A1 (en) | 2014-07-10 |
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