Electrophotographic photoreceptor and image forming apparatus and image forming method using the same

An electrophotographic photoreceptor comprising at least a photosensitive layer and a protective layer sequentially layered on a conductive support, wherein

• the protective layer contains a cured product of a curable composition containing p-type semiconductor fine particles, an n-type organic semiconductor, and a polymerizable compound,
• the p-type semiconductor fine particles are formed from at least one compound selected from the group consisting of compounds represented by chemical formulas (6) to (8):
• M1Cu2O2 (6)
• CuM2O2 (7)
• CuM3O (8)
• wherein M1 represents an element in group 2, M2 represents an element in group 13, and M3 represents an element in group 5, and
• the n-type organic semiconductor contains at least one compound selected from the group consisting of ETM01, ETM02, ETM03, ETM04, ETM05, ETM06, ETM201, ETM202, ETM203, ETM301, ETM302, ETM303, 2,5-di-tert-butyl-p-quinone, 2,6-di-tert-butyl-p-quinone, 2,3,5,6-tetra-tert-butyl-p-quinone, naphthoquinone, anthraquinone, 3,3′,5,5′-tetra-tert-butyl-4,4′-diphenoquinone, 3,3′,5,5′-tetramethyl-4,4′-diphenoquinone, 3,3′,5,5′-tetraethyl-4,4′-diphenoquinone, 3,3′,5,5′-tetra-n-butyl-4,4′-diphenoquinone, 3,3′-di-tert-butyl-5,5′-dimethyl-4,4′-diphenoquinone, bianthrone, ETM314, ETM401, and ETM501,
• wherein the ETM01, ETM02, ETM03, ETM04, ETM05, ETM06, ETM201, ETM202, ETM203, ETM301, ETM302, ETM303, ETM314, ETM401, and ETM501 are as follows: