Photocurrent kinetics and processes of polarization in vanadyl phthalocyanine

R.I.Bunyo, G.I.Grigorovich, Ya.I.Vertsimakha*

Drohobych State Pedagogical Institute, 24 I.Franko St., 293720 Drohobych, Lviv region, Ukraine
*Institute of Physics, National Academy of Sciences of Ukraine,  46 Nauki Ave., 252028 Kyiv, Ukraine

The photocurrent kinetics of sandwich structures based on vanadyl phthalocyanine films with different types of semitransparent top electrode (CuJ, Ni, Al) and transparent bottom SnO2 electrode and the effect of applied voltage value and direction and also charge carriers injection on this kinetics have been investigated.
The decrease of photovoltaic short-circuit photocurrent (Isc) is observed under light pulse action onto blocking Al electrode. This decrease can be fitted by two exponents with different relaxation times and is due to capturing of nonequilibrium carriers on two centers localized in AlOx layer and depolarization current arising. The hypothesis is confirmed by depolarization current arising after the light action is over and by the similarity of dark current kinetics for the charge carriers injection from electrode in electric field.

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