Structural Characterization of the CGL/CTL Interface in a Layered Organic Photoreceptor

Abstract

We have investigated the CGL (carrier generation layer)/CTL (carrier transport layer) interface, where photocarriers are extrinsically produced, from a microscopic viewpoint. From cross-sectional TEM (transmissiom electron microscope) micrographs of layered photoreceptors, the photocarrier generation site is revealed to be formed as a result of CTM (carrier transport material) penetration from CTL during the wet-coatings. This phenomenon was interpreted based on diffusion. From the measurement of CGM (carrier generation meterial) photoluminescence quenching by the CTM, only the CTMs that make contact with CGM particles are known to promote the photocarriers. The electron-transfer reaction for photocarrier generation is proven to occur adiabatically.