Abstract
A thin C60 or bathocuproine (BCP) layer of 5 nm thickness is inserted to the Au/Zn-phthalocyanine (ZnPc) interface of a Au/ZnPc/In/Al Schottky-junction cell, and the effect of the insertion on the dark current is investigated. The forward dark current density is increased from 0.5mA∕cm2 to 9.7 and 9.2mA∕cm2 by the insertions of the C60 and BCP layers, respectively. The increase is not attributed to a change in the barrier height for the hole injection, but to a decrease of the concentration of trapped negative charges on the ZnPc surface.
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