WO1994015370A1 - Structure de diode metal-isolant-metal et son procede de fabrication - Google Patents
Structure de diode metal-isolant-metal et son procede de fabrication Download PDFInfo
- Publication number
- WO1994015370A1 WO1994015370A1 PCT/KR1993/000117 KR9300117W WO9415370A1 WO 1994015370 A1 WO1994015370 A1 WO 1994015370A1 KR 9300117 W KR9300117 W KR 9300117W WO 9415370 A1 WO9415370 A1 WO 9415370A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- electrode
- metal layer
- metal
- mim
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1365—Active matrix addressed cells in which the switching element is a two-electrode device
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/441—Interconnections, e.g. scanning lines
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N70/00—Solid-state devices having no potential barriers, and specially adapted for rectifying, amplifying, oscillating or switching
Definitions
- This invention relates to a liquid crystal display device of an active matrix type, particularly a structure of a metal-insulator-metal (MIM) diode used as a switching element of the liquid crystal display device. And its manufacturing method.
- MIM metal-insulator-metal
- Liquid crystal display devices that use liquid crystal materials whose light transmittance or refractive index changes due to changes in the electric field, magnetic field, or temperature can be driven not only small and light, but also at low voltage, and have low power consumption. Various.
- a typical liquid crystal display is configured in a matrix system.
- X electrode and scanning electrode (Y electrode) are cross-arranged and a voltage is applied between the two electrodes.
- Liquid crystal molecules are selected and driven in a time-sharing manner.
- such a simple matrix method is a so-called crosstalk in which a voltage is applied even at non-selected intersections as the number of scanning electrodes increases.
- an active matrix type liquid crystal display device in which switching elements for switching liquid crystal molecules are arranged in a matrix form has been developed.
- the active matrix method is roughly divided into a method using thin film transistors and a method using a diode.
- the MIM diode structure is widely used in the diode method.
- MIM Daio - de structure thin film formed on the oxide tantalum TA20 5 current is very non-linear - using points having conductive Rin characteristics or, as shown in ⁇ 1, MIM Daio -.
- De D is The element is switched by the signal electrode X and the scanning electrode Y, and switching is performed so that the liquid crystal molecules of the element are excited only when a predetermined critical voltage or more is applied.
- the liquid crystal plays the role of a capacitor and has a memory capacity to store an S image until the application of the second driving force.
- FIG. 2 An active matrix type liquid crystal display device using a general MIM diode structure is shown in Fig. 2. As shown in Fig. 2, indium tin oxide (Indium oxide) for forming a window element is used.
- the transparent electrode 7 composed of Tin Oxide (IT0) is applied to the lead-in electrode 3 of the data bus (DB) through the diode D.
- an insulating film 5 made of tantalum oxide is formed on the upper part of the drawing electrode 3. Is formed, and a contact electrode 8 using chromium Cr is formed on the upper part of the whole structure, thereby forming a MIM diode.
- an object of the present invention is to provide a diode structure capable of reducing the parasitic capacitance and capable of forming a large uniform film, and a method of manufacturing the same.
- the structure of the MIM diode of the present invention is characterized in that a porous aluminum oxide layer is formed between the insulating layer and the metal layer for the contact electrode. .
- the manufacturing method of the MIM diode of this invention is to form a puffer layer on a substrate. Stacking a first metal layer and a second metal layer on the buffer layer and etching them in the form of a data path and a drawing electrode to form a pattern. gold ⁇ by oxidizing pattern - forming an emission reduction expired was first gold ⁇ double insulation ⁇ top to Ta 2 0 5 layer and ⁇ - ⁇ 1 2 0 3 layer, IT0 layer on the Ze' layer Forming a transparent electrode by depositing and etching a third metal layer on the double insulating layer and the transparent electrode, and patterning into a contact electrode form by etching. It is characterized by becoming.
- Figure 1 shows an equivalent circuit for an active matrix liquid crystal display.
- Fig. 2 shows a flat field of a liquid crystal display using a general MIM diode structure.
- Figure 3 shows a section of the MIM diode following the X-X line in Figure 2.
- Fields 4A through 4J are cross-sections to illustrate an embodiment of this invention.
- Fields 5A and 5B are cross-sections to illustrate other embodiments of the invention.
- Fields 4A to 4J are cross-sections for clarifying the method of manufacturing the MIM diode according to this invention.
- ⁇ 4A is using the oxide tantalum Ta 2 0 5 on the substrate 1 ivy buffer ⁇ 2 thermal
- the cross section of the state formed by the growth process is shown in FIG. 4B.
- the first metal scrap 3 for the drawing electrode using tantalum Ta is formed on the upper part of the above-mentioned buffer 2 with a thickness of, for example, 20 nm. It is a cut of the state that was done.
- the 4C is a cross section of a state where the first metal layer 3 is patterned by a masking process and an etching process.
- the etching process is a dry etching process such as a plasma etching or an electron beam etching. A method is preferred, but a wet etching method can also be used.
- 4D shows a state in which a second metal slug 4 using aluminum A1 is formed to a thickness of, for example, 400 nm on the exposed buffer layer 2 and the patterned first metal layer 3. It is a cross section.
- An orchard 4E is a cut-off field in which the second metal layer 4 is patterned by a masking step and an etching step, and a field 4F is the first and second metal layers 3 which have been patterned. and 4 is oxidized pattern - emissions reduction has been the first ⁇ the top to the oxidation of the gold exhibition layer 3 tantalum Ta 2 0 5 layer and the oxidation of the porous Aruminiumu p-A1 2 0 3 layer 5 and 6 is made form It is a cross section.
- the oxidation step A method of putting the 4 phosphate solution is applied to Denrin to the first gold ⁇ 3 is desired, it can also be used ⁇ acid aqueous solution.
- the formed by the oxidation process the [rho-[alpha] 1 2
- the thickness of the third layer 6 is preferably, for example, 500 nm, and the thickness of the layer & 20 layer 5 formed by oxidizing from the surface of the patterned first metal layer 3 is ⁇ - [alpha] 1 2 0 is about 1/10 of the three layers 6, for example, 50 nm is desirable.
- ⁇ 4G is the exposed upper portion of the buffer layer 2 and the ⁇ - ⁇ 1 2 0 3 layer 6 This is a cross section of the state where the ITO layer 7 was formed.
- # 4 is a cross section of the state where the IT0 layer 7 was patterned by a masking process and an etching process.
- the exposed puffer layer 2 pattern - third gold ⁇ 8 for contact slow electrostatic ffi such as emission reduction has been IT0 layer 7 and the .rho. [alpha] 1 2 0 3 layer 6 upper chromium Cr in Is a cut-off field in which the was formed.
- 5A and 5B are cross-sectional plots for explaining another embodiment of the present invention.
- 5A shows a buffer layer 2, a first gold layer 3 and a third metal layer 4 on a substrate 1.
- 5B is a cross-sectional view of a state in which the first and second metal slaughters 3 and 4 have formed a predetermined pattern by a masking process and an etching process. ⁇ After the patterning process shown in 5B, the oxidation process shown in 4F proceeds.
- the two layers can be simultaneously etched to form an insulating layer.
- parasitic capacitance: 1 is slightly increased compared to the solid 4A to ⁇ 4J embodiments, but the top surface with a large contact area is dielectric. since the rate is Ze' small P- A1 2 0 3 carcass 6 Metsujiru this addition, the parasitic capacitance as compared to obey ⁇ surgery Akira al.
- the parasitic capacitance of the diode structure is significantly reduced, and the response speed of Huawei is fast, preventing the sudden change of power.
- the structure of the diode of this invention is A liquid crystal display device with niche quality and high information density can be configured.
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP94903110A EP0629008A4 (en) | 1992-12-28 | 1993-12-28 | STRUCTURE OF A MIM DIODE AND METHOD FOR THEIR PRODUCTION. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1992/25683 | 1992-12-28 | ||
| KR1019920025683A KR950011960B1 (ko) | 1992-12-28 | 1992-12-28 | 엠아이엠(mim) 다이오드 구조 및 그 제조방법 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1994015370A1 true WO1994015370A1 (fr) | 1994-07-07 |
Family
ID=19346817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR1993/000117 Ceased WO1994015370A1 (fr) | 1992-12-28 | 1993-12-28 | Structure de diode metal-isolant-metal et son procede de fabrication |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0629008A4 (ja) |
| KR (1) | KR950011960B1 (ja) |
| WO (1) | WO1994015370A1 (ja) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0345932A (ja) * | 1989-07-13 | 1991-02-27 | Citizen Watch Co Ltd | アクティブマトリクス液晶表示パネルの製造方法 |
| JPH04223335A (ja) * | 1990-12-26 | 1992-08-13 | Matsushita Electric Ind Co Ltd | 誘電体薄膜の製造方法 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE633414A (ja) * | 1962-06-18 | 1900-01-01 | ||
| FI91575C (fi) * | 1986-12-08 | 1994-07-11 | Rca Corp | Diodi, jossa on sekaoksidieristin |
-
1992
- 1992-12-28 KR KR1019920025683A patent/KR950011960B1/ko not_active Expired - Fee Related
-
1993
- 1993-12-28 WO PCT/KR1993/000117 patent/WO1994015370A1/ja not_active Ceased
- 1993-12-28 EP EP94903110A patent/EP0629008A4/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0345932A (ja) * | 1989-07-13 | 1991-02-27 | Citizen Watch Co Ltd | アクティブマトリクス液晶表示パネルの製造方法 |
| JPH04223335A (ja) * | 1990-12-26 | 1992-08-13 | Matsushita Electric Ind Co Ltd | 誘電体薄膜の製造方法 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP0629008A4 * |
Also Published As
| Publication number | Publication date |
|---|---|
| KR950011960B1 (ko) | 1995-10-12 |
| EP0629008A4 (en) | 1996-12-27 |
| EP0629008A1 (en) | 1994-12-14 |
| KR940015622A (ko) | 1994-07-21 |
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