Layered electrophotographic photoreceptor

Charge generating and transporting behavior of irradiated m.etallotetrapyr-role layers is exploited in the function of colour copiers [281-284]. Suited and practically used electrophotographic photoreceptors in the copiers comprise TiPc, TiOPc, VOPc, MnPc as parts of the layers. 

In numerous patents the synthesis of suitable furo-, thieno-, and pyrrolo-tropylium salts is described, for example, that of squarylium dyes like 623 and 624 (Scheme 169 85JAP60/262163 86JAP61/185487 88JAP63/41858, 88JAP63/102990). These substances serve as components of photoconduc-tive thin layers for electrophotographic photoreceptors. The materials are claimed to exhibit increased sensitivity, stability on storage, and durability to laser-beam reading. 

JP 05197182 (Japanese) 1993 Electrophotographic Photoreceptor with Amorphous Silicon Pho-toconductive Layer Fuji Xerox Co. Ltd., Japan S Yagi et al. Copolymer useful for surface protective coating photoreceptor shows stability and gives sharp images Maleimide-terminated siloxane-imides crosslinked coatings were used to protect photoreceptors. 

CVD of boron nitride films on silicon or germanium or on printed circuit boards is now a common practice in the electronic industry [154 to 162]. The high thermal conductivity combined with the excellent electrical insulation properties are most valuable for these applications [163] see additional references in Section 4.1.1.10.8, p. 129. The use of a-BN layers is of particular importance in the manufacture of electrophotographic photoreceptors (such as solar cells) and of X-ray lithographic masks (see Section 4.1.1.10.8, p. 129). In the last mentioned application, structural aspects of the deposited films are of importance. In films still containing hydrogen, (N)H moieties are depleted by annealing at about 600°C, while (B)H moieties are depleted above 1000°C [164]. Also, elastic stiffness and thermal expansion of boron nitride films have to be viewed in connection with the temperature-dependent stress of CVD-deposited boron nitride films [165]. Reviews of properties and electronic applications of boron nitride layers have appeared in Polish [166] and Japanese [167]. 

Another field of application for boron nitride is its use as blocking layer and/or surface layer in electrophotographic photoreceptors [69 to 96,380]. Again, these layers are produced by the CVD methods described in Section 4.1.1.10.2, p. 62. Depending on the deposition method or specific conditions, the boron nitride layers in the electrophotographic receptors may also consist of or contain p-BN [97 to 100]. 

Photoreceptors for electrophotography have interlayers containing alkylated PTs like 3-methyPT between an electrically conductive substrate and a light-sensitive layer [138-140]. Also other substituted thiophenes can be used for the electropolymerization of electrophotographic photoreceptors [141-143]. 

Enokida, T. and Hirohashi, R. (1992). Electrophotographic dual-layered photoreceptors incorporating copper phthalocyanines. / Imag. Sci. TechnoL, 36, 135 1. [207]... 

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