JPH0534945A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To provide an org. electrophotographic sensitive body having high sensitivity and excellent mechanical strength, usable as a sensitive body for a negative electrification system in which the sensitive body is first electrified with negative charges and then partially irradiated with visible light so as to vanish the negative charges in the irradiated region and as a sensitive body for a positive electrification system in which the sensitive body is first electrified with positive charges, ensuring high potential by electrification and not accumulating residual potential even after repeated electrification and exposure. CONSTITUTION:A single layer type photosensitive body 2 contg. polysilane and 0.01-0.8wt.% carrier generating agent basing on the amt. of the polysilane is formed on an electric conductive substrate 1 to obtain an electrophotographic sensitive body.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an electrophotographic photoreceptor. In particular, even for a negative charging method of initially charging with a negative charge and partially irradiating visible light to eliminate the charge in the region where this visible light is partially irradiated, a positive polarity having the opposite polarity is also used. The present invention relates to an electrophotographic photosensitive member that can also be used for a charging system.

[0002]

2. Description of the Related Art Electrophotographic photoreceptors are widely used as means for extracting images, forming latent images, and adhering toner to copiers and printers, and historically, inorganic light such as selenium, zinc oxide, and cadmium sulfide was used. An inorganic electrophotographic photosensitive member including a photosensitive layer containing a conductive material as a main component has been used. But,
Inorganic electrophotographic photoconductors are not always satisfactory in properties such as sensitivity, thermal stability, moisture resistance, and printing durability, and have a problem of toxicity. The body was developed.

This organic electrophotographic photosensitive member is an organic carrier which is an organic substance having a charge transfer ability on a carrier generating layer containing a carrier generating agent which generates a charge by being polarized when a voltage is applied. A multi-layered photoconductor in which a carrier-transporting layer containing a transporting agent is laminated. This multi-layer organic electrophotographic photoconductor is superior in that it is less toxic than an inorganic electrophotographic photoconductor and can be manufactured at low cost. And is widely used mainly in small copying machines. In contrast, the inorganic electrophotographic photoconductor is basically used in the positive charging system, whereas the organic electrophotographic photoconductor does not have good performance in the positive charging system and is used exclusively in the negative charging system. The reason is,
Among the carrier transport agents used for multilayer organic electrophotographic photoreceptors, organic hole transport agents with large hole mobility and excellent sensitivity have been developed, but organic electron transport agents are safe and stable. However, a multi-layer organic electrophotographic photoreceptor having a layer structure in which an organic carrier transporting layer is laminated on an organic carrier generating layer operates only in a negative charging system. is there.

[0004]

However, the negative charging type photoconductor has the following drawbacks. (1) In order to uniformly attach negative charges to the surface of the electrophotographic photosensitive member, it is common to use corona discharge generated in the air, but it is unavoidable when a unit amount of negative charges is attached. It is said that the amount of ozone that is generated as much as 10 times that in the case of attaching an equivalent amount of positive charge, and the presence of this large amount of ozone accelerates the deterioration of the material of the surface of the electrophotographic photosensitive member. When it is repeatedly used, the initial charging potential becomes insufficient, which causes the charging device to become dirty and cause irregular charging (uneven charging).

(2) To develop the latent image of the negative charging photosensitive member so that it can be visually observed, a positive polarity toner is required. The positive polarity toner is triboelectrically charged to ferromagnetic carrier particles. Due to the large coefficient, it is not easy to manufacture.

Therefore, there is a demand for the development of an organic electrophotographic photosensitive member which can be used in a positive charging system in which a positive charge is attached to an organic photosensitive member and the latent image is partially eliminated to form a latent image. Efforts are being made to develop positively charged organic electrophotographic photoreceptors. As a successful example, for example, Japanese Patent Laid-Open No.
There is an electrophotographic photosensitive member disclosed in Japanese Laid-Open Patent Publication No. 1-170747, which is a layered positive charging photosensitive member in which polysilane is used as a carrier transporting layer and a carrier generating layer is laminated thereon, but is a surface layer. Since the carrier generation layer is very thin, brittle and easily deteriorates, printing durability and durability are poor,
Not practical.

Although the above is a two-layer type, by simplifying this, a single-layer type positive charging type photoconductor in which a hole (positive charge) transfer agent and a carrier generating agent are uniformly dispersed in a binder resin is also developed. However, the carrier generator is usually used in an amount of 1 wt% or more, and in some cases, 30 to 50 wt.
% Also needs to be included, and as will be described later in Comparative Example 3,
There are drawbacks that the initial charging potential does not rise sufficiently and the residual potential after light irradiation does not drop sufficiently, which is not satisfactory in practice.

The present invention has been made under such an environment and can be used as a negative charging type or a positive charging type, a high charging potential can be obtained, and repeated charging exposure can be performed. An object of the present invention is to provide an organic electrophotographic photosensitive member which does not accumulate residual potential, has high sensitivity, is excellent in mechanical strength, and has a simple manufacturing process.

[0009]

The above object is to provide polysilane and 0.01% of this polysilane on a conductor substrate (1).
This is achieved by an electrophotographic photoreceptor in which a single-layer photoreceptor (2) containing .about.0.8 wt% carrier generator is formed.

Among the above components, the conductive substrate is a conductive substrate made of copper, aluminum, or other alloy,
On a support such as glass, ceramics, paper or plastic film, a conductive substrate coated with metal, conductive metal oxide, carbon or the like, or on a support such as glass, ceramics, paper or plastic film, metal, A conductive substrate coated with a resin in which a conductive metal oxide, carbon or the like is dispersed can be used.

The conductive substrate may have a sheet shape, a drum shape, or another shape. Next, among the above-mentioned constituents, polysilane generally includes a polymer, particularly a polymer, a copolymer, or a terpolymer having the following structural formula, and methylphenylpolysilane is preferable.

The polysilane, which is one of the components of the composition constituting the carrier transport layer 1 constituting the electrophotographic photoreceptor according to the present invention, is generally a polymer, particularly a homopolymer, a copolymer or a terpolymer represented by the following formula. Including polymers.

[0013] However, in the formula, R ₁ , R ₂ , R ₃ , R ₄ , R ₅ , and
R ₆ is selected from the group consisting of an alkyl group, an aryl group, a substituted alkyl group, a substituted aryl group, and an alkoxy group, and m, n, and p are the proportions of the above monomer units in the total polymer composition. The total number of m + n + p is equal to 100%, and each of m, n, or p may be 0 to 100%. All of the above polysilane monomer units are randomly distributed throughout the polymer or are block-shaped. The number average molecular weight of this polysilane is preferably 1,000 to 2,000,000, more preferably 5,000 to 600,000, and particularly preferably 10,000 to 30,000. 2,000,0
If it exceeds 00, the solution viscosity may be too high and the coatability may be deteriorated. If it is less than 1,000, practical film strength may not be obtained.

Further, examples of the alkyl group in the substituent represented by R in the above general formula include 1 carbon atom to about 2 carbon atoms.
A straight chain or branched alkyl group having 4 carbon atoms, preferably 1 to 8 carbon atoms, for example a methyl group,
Unsaturated alkyl groups including ethyl, propyl, butyl, amyl, hexyl, octyl, nonyl, decyl, pentadecyl, stearyl, or allyl, and other similar substituted alkyls. There is a basis. Particularly preferred alkyl groups are methyl group, ethyl group,
A propyl group and a butyl group. Aryl substituents have 6 to about 24 carbon atoms and include phenyl, naphthyl, and anthryl groups. These alkyl and aryl groups can be substituted with alkyl groups, aryl groups, halogen groups, nitro groups, amino groups, alkoxy groups, cyano groups, and other related substituents.

Examples of alkoxy groups are those having 1 to about 10 carbon atoms such as methoxy, ethoxy, propoxy, butoxy, and other like substituents. Specific examples of the polysilane included in the above general formula include poly (methylphenyl) silane, poly (methylphenylsilylene-co-dimethyl) silane, poly (phenylethyl) silane, poly (p-tolylmethyl) silane, Polysilane having phenyl group such as poly (diphenylsilylene-co-phenylmethyl) silane, poly (cyclohexylmethyl) silane, poly (tertiary-butylmethyl) silane, poly (n-propylmethyl) silane, poly (cyclotrimethylene) silane , Poly (cyclotetramethylene) silane, poly (cyclopentamethylene) silane, poly (di-t-butylsilylene-co-dimethyl) silane, poly (cyanoethylmethyl) silane, poly (2-
Examples thereof include acetoxyethylmethyl) silane and poly (2-carbomethoxyethylmethyl) silane. Polysilanes having a phenyl group are particularly preferable, and poly (methylphenyl) silane is most preferable.

These polysilanes can be synthesized by a known method (for example, RC West, Comprehensive).
Organic Chemistry, Vol.2, Chapter 9.4, P.365 ~ 387
(1982), edited by G. Wilkinson et al., Pergamon Pr
ess, New York).

Thirdly, among the above constituents, the carrier generator must be a substance having a property of absorbing visible light to generate an electric charge (carrier). For example, a metal phthalocyanine dye, a perylene pigment, etc. The following organic materials can be used, but typical examples thereof are listed below. 1. Phthalocyanine dyes such as metal phthalocyanine and metal-free phthalocyanine 1. Monoazo dye, polyazo dye, metal complex salt azo dye,
Azo dyes such as pyrazoline azo dyes, stilbene azo dyes and thiazole azo dyes. 3. Perylene-based pigments such as perylene anhydride and perylene imide 4. Anthraquinone derivative, Antoanthrone derivative,
4. Anthraquinone-based or polycyclic quinone-based dyes such as dibenzpyrenequinone derivatives, pyrantrone derivatives, violanthrone derivatives and isobiolanthrone derivatives 5. 5. Indigoid-based pigments such as indigo derivatives and thioindigo derivatives 6. Diphenylmethane dye, triphenylmethane dye,
Carbonium dyes such as xanthene dyes and acridine dyes 7. 7. Quinoneimine dyes such as azine dye, oxazine dye and thiazine dye 7. Methine dyes such as cyanine dyes and azomethine dyes Quinoline dye 10. Nitro dye 11. Nitroso dye 12. Benzoquinone and naphthoquinone dyes 13. Naphthalimide dye 14. Perinone dyes such as bisbenzimidazole derivatives 15. Quinacridone dye More preferably, 1. Phthalocyanine dyes such as metal phthalocyanine and metal-free phthalocyanine, for example, titanyl phthalocyanine 2. Monoazo dye, polyazo dye, metal complex salt azo dye,
Azo dyes such as pyrazoline azo dyes, stilbene azo dyes and thiazole azo dyes.

In the photoreceptor according to the present invention, the content of the carrier generator is 0.01 wt% based on polysilane.
% -0.8 wt%, preferably 0.05 wt% -0.
5 wt%, and more preferably 0.1 to 0.3 wt%. According to the result of the experiment, below 0.01 wt%,
The generation of electric charges (carriers) from the carrier generating agent is not sufficient, and the sensitivity of the photoconductor decreases, and when it exceeds 0.8 wt%, the light absorption near the surface of the photoconductor becomes large, and the photoconductive layer where the light cannot reach It has been confirmed that the carrier generating agent in the deep portion acts as a trap for electric charges (carriers), lowers the charging potential, interferes with the lowering of the residual potential after light irradiation, and deteriorates the contrast.

To form a single-layer type photoreceptor, polysilane and a carrier generator are mixed and dissolved in an organic solvent such as toluene, tetrahydrofuran, cyclohexanone, diethylbenzene, etc., and dip coating method, spin coating method, Alternatively, it may be formed by coating the conductive substrate using a spray coating method.

At this time, if necessary, a binder resin may be mixed with the photoreceptor, but the content thereof is preferably 0 wt% to 50 wt% based on polysilane. Polysilane itself does not necessarily require a binder resin because it has practically sufficient mechanical strength. Therefore, the binder may be added only when high mechanical strength is required, but in that case as well, if the mixture exceeds 50 wt%, the conductivity may be increased between the polysilane molecules that transport charges (carriers) based on the hopping conduction function. Since there is no binder resin, the smooth carrier transport is hindered, photoconductivity is impaired, and sensitivity is lowered.
Do not mix more than 0 wt%.

The binder resin may be any resin having high mechanical strength, such as polycarbonate, polyethylene, polypropylene, butyral resin, phenol resin, oxygenated polysilanes, organopolysiloxanes, etc. Resins composed of compounds containing silicon and oxygen, such as oxygenated polysilanes and organopolysiloxanes, are used because of their compatibility with polysilanes and the fact that polysilanes do not lose photoconductivity even when mixed in a relatively high concentration. Particularly preferred.

The layer thickness of the single-layer type photoconductor formed on the conductive substrate is preferably 2 μm to 50 μm. If it is less than 2 μm, it is not possible to obtain a sufficient charging potential for practical use.
This is because if the thickness exceeds μm, the electric field applied to the electric charges (carriers) becomes small, which may cause a decrease in sensitivity and an obstacle to a decrease in residual potential after light irradiation.

The object of the present invention is an electrophotographic photosensitive member in which a single-layer type photosensitive member is formed on a conductive substrate, and an amorphous silicon layer, between the conductive substrate and the single-layer type photosensitive member, Aluminum oxide, indium oxide, tin oxide, polypropylene resin, acrylic resin, methacrylic resin, polyvinyl chloride resin, epoxy resin, polyester resin, alkyd resin, polyurethane resin, polyimide resin, etc.,
It is particularly preferable to interpose an amorphous silicon layer. This is because dark decay is prevented and adhesion is improved.

The electrophotographic photosensitive member according to the present invention is suitable for use in, for example, a laser beam printer, and a semiconductor laser or an LED is suitable as a light source.

[0025]

EXAMPLES The present invention will be described more specifically below with reference to Examples and Comparative Examples. Example 1 0.6 parts by weight of α-type titanyl phthalocyanine (0.3 wt% based on polysilane) and tetrahydrofuran 10
0 part by weight was placed in a ball mill using stainless beads as a dispersion aid, and dispersed and stirred for 24 hours.

To this, 200 parts by weight of methylphenylpolysilane (number average molecular weight 16,000) was added, 700 parts by weight of toluene was added as a solvent, and the mixture was further stirred for 3 hours. See FIG. 1. This dispersion liquid was applied onto an aluminum plate 1 using a bar coating method and dried to form a single layer type photoreceptor 2 having a thickness of 20 μm.

Using an electrostatic copying paper tester (EPA-8100 manufactured by Kawaguchi Denki Seisakusho Co., Ltd.), the initial charging potential of the above-mentioned photoconductor, the charge holding power at the time of non-irradiation of light, and the half exposure amount, The residual potential after light irradiation was measured.

Comparative Example 1 (Layered Electrophotographic Photosensitive Member for Negative Charging System) 1 part by weight of α-type titanyl phthalocyanine, 80 parts by weight of tetrahydrofuran and 20 parts by weight of cyclohexane were placed in a ball mill using stainless beads as a dispersion aid, and 24
After stirring for 1 hour by dispersion, 1 part by weight of butyral resin was added as a binder, and the mixture was further stirred for 3 hours and applied on an aluminum substrate (not shown) using a bar coating method to generate a carrier of 0.3 μm. A layer (not shown) was formed.

A solution of 200 parts by weight of methylphenylpolysilane and 700 parts by weight of toluene as a solvent, which was the same as in Example 1, was further applied onto the above-mentioned carrier generating layer using a bar coating method, and the solution was applied at 60 ° C. Dry for 2 hours at 20
A μm carrier transport layer (not shown) was formed.

The laminated electrophotographic photosensitive member manufactured as described above was subjected to an initial charging potential and an electric charge when not irradiated with light by using an electrostatic copying paper test apparatus (EPA-8100 manufactured by Kawaguchi Electric Co., Ltd.). The holding power, the half-exposure amount (sensitivity), and the residual potential after light irradiation were measured.

Comparative Example 2 (Layered Electrophotographic Photosensitive Member for Positive Charging System) A solution prepared by adding 500 parts by weight of tetrahydrofuran and 200 parts by weight of diethylbenzene as a solvent to 200 parts by weight of the same methylphenylpolysilane as in Example 1, It was coated on an aluminum substrate (not shown) using a bar coating method and dried at 60 ° C. for 2 hours to form a 20 μm carrier transport layer (not shown).

On top of that, α-type titanyl phthalocyanine 1
Parts by weight, 80 parts by weight of tetrahydrofuran and 20 parts by weight of cyclohexane were placed in a ball mill using stainless beads as a dispersion aid, dispersed and stirred for 24 hours, then 1 part by weight of butyral resin was added as a binder, and further dispersed and stirred for 3 hours. Is applied using the bar coat method, and 60
It was dried at 0 ° C. for 30 minutes to form a 0.3 μm carrier generation layer (not shown).

The electrophotographic photoconductors of Example 1, Comparative Example 1 and Comparative Example 2 manufactured as described above were subjected to an electrostatic copying paper test apparatus (EPA-8100 manufactured by Kawaguchi Electric Co., Ltd.). The initial charge potential, the charge retention power when not irradiated with light, the half-exposure amount, and the residual potential after light irradiation were measured.

Table 1 shows the results of experiments on the above-mentioned Example 1 and Comparative Examples 1 and 2. Table 1 (a) positively charged electrophotographic characteristics test E _1/2 Item _{V 0 (V) V 1 (} V) (μJ / cm 2) V RZ (V) Example 1 Tasu567 Tasu536 1.2 +78 Comparative Example 1 Tasu784 +784 No attenuation +778 Comparative example 2 +410 +339 1.1 +70 (b) Negative charging electrophotographic characteristic test E _1/2 item V ₀ (V) V ₁ (V) (μJ / cm ² ) V _RZ (V) Implementation Example 1 -800 -730 1.2 -47 Comparative Example 1 -401 -326 1.2 -56 Comparative Example 2 -799 -796 Not attenuated -782 However, the electrostatic copying paper test apparatus is EPA-8100 (trade name). : Kawaguchi Electric Co., Ltd., static measurement method,
Applied voltage: ± 6.4 kv), V ₀ is the surface potential immediately after the charge is attached (the initial charging potential), V ₁ is the surface potential after 2 seconds (the charge retention force when not irradiated with light), E _1/2 is the exposure amount (half exposure amount) required for the surface potential to decay to 0.5 V ₁ , and V _RZ is the surface potential (residual potential) 5 seconds after the exposure.

In comparison with Comparative Example 1, which is a representative of the negative charging type laminated electrophotographic photosensitive member, in this Example, as is clear from the table, the initial charging potential is about twice as large as that of Comparative Example, which is sufficiently large. On the other hand, the potential decay rate by light irradiation is 87% in the comparative example, and 95% in the example, which is also sufficiently large.

Further, in comparison with Comparative Example 2 which represents a positive charging type laminated electrophotographic photosensitive member, in this Example, as is apparent from the table, the initial charging potential is increased by about 40% as compared with the Comparative Example. Therefore, they are fully satisfied. On the other hand, the potential attenuation rate due to light irradiation is 82% in the comparative example and 87% in the example, which is not much different.

Example 2 Refer to FIG. 1 0.2 parts by weight of α-type titanyl phthalocyanine (0.1 wt% based on polysilane) and tetrahydrofuran 10
0 part by weight was added, and the mixture was dispersed for 24 hours with a ball mill containing stainless beads as a dispersion aid.

To this was added 200 parts by weight of methylphenylpolysilane similar to that used in Example 1, and toluene 70 was used as a solvent.
0 part by weight was added, and the mixture was further dispersed and stirred for 3 hours using a ball mill.

This dispersion is applied onto an aluminum plate 1 by a bar coating method and dried to obtain a 20 μm single layer type photoreceptor 2.
Formed. Comparative Example 3 (Example in which the elements constituting the photoconductor are the same, but the composition ratio of the carrier generator is large) α-type titanyl phthalocyanine 5 wt% based on polysilane
A single-layer type photoconductor (not shown) of 20 μm was formed on a substrate (not shown) in the same manner as in Example 2 except that the content was changed to%.

The electrophotographic photoconductors of Example 2 and Comparative Example 3 produced as described above were each subjected to an initial test using an electrostatic copying paper tester (EPA-8100 manufactured by Kawaguchi Electric Co., Ltd.). The charging potential, the charge retention force when not irradiated with light, the half-exposure amount, and the residual potential after irradiation with light were measured. The results are shown in Table 2.

[0041] Table 2 (a) positively charged electrophotographic characteristics test E _1/2 Item _{V 0 (V) V 1 (} V) (μJ / cm 2) V RZ (V) Example 2 Tasu571 Tasu536 1.2 +41 Comparison example 3 +310 +256 8.4 +63 (b) negatively charged electrophotographic characteristics test E _1/2 item _{V 0 (V) V 1 (} V) (μJ / cm 2) V RZ (V) example 2 -630 -582 1.2-54 Comparative Example 3 -216 -162 2.8 -42 However, the electrostatic copying paper test apparatus is EPA-8100 (trade name: manufactured by Kawaguchi Electric Co., Ltd., static measurement method,
Applied voltage: ± 6.4 kv), V ₀ is the surface potential immediately after the charge is attached (the initial charging potential), V ₁ is the surface potential after 2 seconds (the charge retention force when not irradiated with light), E _1/2 is the exposure amount (half exposure amount) required for the surface potential to decay to 0.5 V ₁ , and V _RZ is the surface potential (residual potential) 5 seconds after the exposure.

As compared with Comparative Example 3 in which the composition of the photoconductor is the same but the composition ratio of the carrier generator is large, the initial charging potential in this example is as shown in the table.
In both the positive charging method and the negative charging method, the increase rate is 84% and 92%, respectively, while the potential decay rate is 80% in the positive charging method and 81% in the negative charging method in the comparative example. In contrast, in this embodiment, 93% in the positive charging system and 91% in the negative charging system.
%, Which is a considerable improvement.

[0043]

As described above, the electrophotographic photosensitive member according to the present invention is a single layer containing polysilane and 0.01 to 0.8 wt% of the carrier generating agent of polysilane on the conductive substrate. Type photoconductor is formed. Since it has a single layer structure, it can be used for both positive charging method and negative charging method. Further, the composition ratio of the carrier generator and the polysilane is 0.01 to 0.8 wt%, and the content of the carrier generator is 0.0 based on the polysilane.
1 wt% to 0.8 wt%, preferably 0.05 wt%
~ 0.5 wt%, more preferably 0.1-0.3 w
t%. According to the result of the experiment, if the amount is less than 0.01 wt%, the carrier is not sufficiently generated from the carrier generating agent and the sensitivity of the photoconductor is lowered. It has been confirmed that the absorption becomes large, the carrier generator in the deep part of the photosensitive layer where light does not reach moves as a trap of carriers, lowers the charging potential, interferes with the reduction of the residual potential after light irradiation, and deteriorates the contrast. There is. Therefore, the electrophotographic photosensitive member according to the present invention has a high initial charging potential and a sufficiently small residual potential after light irradiation. This fact has been confirmed by the above experiment, but its theoretical inference is sufficiently possible as described above.

[Brief description of drawings]

FIG. 1 is a layer configuration diagram of an electrophotographic photosensitive member according to first and second embodiments of the present invention.

[Explanation of symbols]

 1 Conductor Substrate 2 Single Layer Type Photoreceptor

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[Procedure amendment]

[Submission date] October 26, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

[0025]

EXAMPLES The present invention will be described more specifically below with reference to Examples and Comparative Examples. Example 1 α-type titanyl phthalocyanine 2 parts by weight (0. 1 wt%, based on the polysilane) in tetrahydrofuran 10
0 part by weight was placed in a ball mill using stainless beads as a dispersion aid, and dispersed and stirred for 24 hours.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

Example 2 Refer to FIG. 1 again. Α-type titanyl phthalocyanine 0. 6 parts by weight (0. 3 wt%, based on the polysilane) and tetrahydrofuran 10
0 part by weight was added, and the mixture was dispersed for 24 hours with a ball mill containing stainless beads as a dispersion aid.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Nobu Sato 1 No. 1 Funami-cho, Minato-ku, Nagoya-shi, Aichi Toagosei Synthetic Chemical Industry Co., Ltd. Nagoya Research Institute (72) Inventor Katsuka Harada Nagoya-shi, Aichi 1 Touna Synthetic Chemical Industry Co., Ltd. Nagoya Research Institute, 1 Funa-cho, Minato-ku

Claims (1)

Claim: What is claimed is: 1. A single-layer type photoconductor (2) comprising polysilane and a carrier generator in an amount of 0.01 to 0.8 wt% of the polysilane on a conductive substrate (1). ) Is formed, the electrophotographic photoreceptor.