Abstract
The effects of a CGM on the photoinjection efficiency (PIE) in the layered organic photoconductor with a-phenylstilbene based-CTL which has a high hole drift mobility have been studied for the first time.
PIE measured shows different features due to the different CGMs, and the rate-determining processes estimated have been classified into two groups of a carrier generation process and a hole injection process.
From oxidation potential measurement, it has proved that a carrier generation process was observed as a rate-determining process when the oxidation potential difference between CGM and CTM was comparatively large, and that a hole injection process was observed when the potential difference was small.
It is considered from these results that the potential difference had driven the hole injection from CGL to CTL quantitatively in the former process and had not in the latter process.
Moreover, the relationship between (i) oxidation potential of azo pigment (CGM) which is the controling factor of hole injection and (ii) its chemical structure has been investigated. It is found that the oxidation potential of azo pigments in this experiment originates in the oxidation potential of diazo component.
