Abstract: An electrophotographic photoreceptor includes a conductive substrate, a photosensitive layer provided on or above the conductive substrate and containing inorganic oxide particles, and an inorganic protective layer provided on the photosensitive layer. In a particle size distribution of the inorganic oxide particles obtained through cross-sectional observation of the photosensitive layer, the highest peak for small-diameter particles A is present in the range of 20 nm to 50 nm, and the highest peak for large-diameter particles ? is present in the range of 80 nm to 400 nm, with the threshold particle diameter for the small-diameter particles A and the large-diameter particles ? being 60 nm, and the relationship between the particle diameter dA at the highest peak for the small-diameter particles A and the particle diameter dB at the highest peak for the large-diameter particles ? satisfies formula (A1) below: dB / dA ? 4. .

Abstract: An electrophotographic photoreceptor includes a conductive substrate, a charge generation layer disposed on the conductive substrate, a charge transport layer disposed on the charge generation layer, and an inorganic surface layer disposed on the charge transport layer, in which a capacitance of the charge transport layer per unit area is 1.5×10?9 F/m2 or greater and 3.8×10?9 F/m2 or less.

Abstract: An electrophotographic photoconductor includes a conductive substrate, and a photoconductive layer, in which an outermost surface layer contains a binder resin, a charge transporting material, fluorine-containing resin particles, and an acidic compound, the number of carboxyl groups in the fluorine-containing resin particles is 0 or more and 30 or less per 106 carbon atoms of the fluorine-containing resin particles, and in a case where charging and exposure of the electrophotographic photoconductor are repeated 10,000 times under conditions of a charging potential of ?700 V and an exposure intensity of 5 mJ/m2, an absolute value |RP1?RP10000| of a difference between a residual potential RP1 after charging and exposure once and a residual potential RP10000 after charging and exposure 10,000 times is 25 V or less.

Abstract: An electrophotographic photoreceptor includes a conductive substrate, an organic photosensitive layer, and an inorganic protection layer arranged in this order, the inorganic protection layer containing a metal oxide that contains oxygen atoms, gallium atoms, and aluminum atoms.

Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer on the conductive substrate, a charge generation layer on the undercoat layer, a charge transport layer on the charge generation layer, and an inorganic protection layer on the charge transport layer, in which the charge transport layer contains a binder resin and a charge transport material, and, when impedance of the charge transport layer is measured, a ratio (C1Hz/C10Hz) of an electrostatic capacitance C1Hz at 1 Hz to an electrostatic capacitance C10Hz at 10 Hz is 1.1 or less.

Abstract: An electrophotographic photoreceptor includes a conductive substrate, an undercoat layer on the conductive substrate, a charge generation layer on the undercoat layer, a charge transport layer on the charge generation layer, and an inorganic protection layer on the charge transport layer, in which the charge transport layer contains a binder resin and a charge transport material, and, when impedance of the charge transport layer is measured, a ratio (C1 Hz/C10 Hz) of an electrostatic capacitance C1 Hz at 1 Hz to an electrostatic capacitance C10 Hz at 10 Hz is 1.1 or less.

Abstract: An electrophotographic photoconductor includes a conductive substrate, and a photoconductive layer, in which an outermost surface layer contains a binder resin, a charge transporting material, fluorine-containing resin particles, and an acidic compound, the number of carboxyl groups in the fluorine-containing resin particles is 0 or more and 30 or less per 106 carbon atoms of the fluorine-containing resin particles, and in a case where charging and exposure of the electrophotographic photoconductor are repeated 10,000 times under conditions of a charging potential of ?700 V and an exposure intensity of 5 mJ/m2, an absolute value |RP1?RP10000| of a difference between a residual potential RP1 after charging and exposure once and a residual potential RP10000 after charging and exposure 10,000 times is 25 V or less.

Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed so as to overlie the conductive substrate and containing a first charge-transporting material having two triphenylamine skeletons and a charge mobility of approximately 4×10?6 cm2/Vs or more and at least one second charge-transporting material selected from the group consisting of a charge-transporting material having one triphenylamine skeleton and a charge mobility of approximately 5×10?5 cm2/Vs or more, a charge-transporting material having two triphenylamine skeletons and being different from the first charge-transporting material, and a charge-transporting material having three triphenylamine skeletons, wherein the second charge-transporting material content is approximately from 0.2 weight % to 1.0 weight % relative to the total charge-transporting material content.

Abstract: An electrophotographic photoreceptor includes a conductive substrate and a photosensitive layer disposed so as to overlie the conductive substrate and containing a first charge-transporting material having two triphenylamine skeletons and a charge mobility of approximately 4×10?6 cm2/Vs or more and at least one second charge-transporting material selected from the group consisting of a charge-transporting material having one triphenylamine skeleton and a charge mobility of approximately 5×10?5 cm2/Vs or more, a charge-transporting material having two triphenylamine skeletons and being different from the first charge-transporting material, and a charge-transporting material having three triphenylamine skeletons, wherein the second charge-transporting material content is approximately from 0.2 weight % to 1.0 weight % relative to the total charge-transporting material content.

Abstract: An electrophotographic photoreceptor includes: a conductive substrate; a charge generation layer that is disposed on the conductive substrate and contains a resin, a phthalocyanine pigment, and a compound represented by the following Formula (BP); and a charge transport layer that is disposed on the charge generation layer and contains a charge transport material, wherein RB1, RB2 and RB3 each independently represent a hydrogen atom, a halogen atom, a hydroxyl group, an alkyl group having from 1 to 10 carbon atoms, an alkoxy group having from 1 to 10 carbon atoms, or an aryl group having from 6 to 10 carbon atoms.