Inverted organic photovoltaic cells with solution-processed zinc oxide as electron collecting layer

Abstract

In this work, inverted polymerfullerene organic photovoltaic (OPV) cells with solution-processed zinc oxide (ZnO) as the electron collecting layer are investigated. ZnO films are prepared simply by the spin-casting of a zinc acetate dehydrate precursor solution, followed by sintering under ambient conditions. The performance of the fabricated inverted OPV cells shows a clear dependence on precursor concentration and sintering conditions. With the ZnO film derived from a sol-gel concentration of 0.1 M and sintered at 350°C for 10min, the inverted OPV cell shows optimum performance. © 2011 The Japan Society of Applied Physics.