Postfabrication annealing of pentacene-based photovoltaic cells

Abstract

We studied the effects of postfabrication annealing on heterojunction photovoltaic cells made from vacuum deposited pentacene and C60. The maximum power conversion efficiency under 115mW∕cm2 illumination increases from 0.45% to 1.07% after annealing the cells at 200°C. The increased performance is a result of better molecular ordering, which leads to an increased shunt resistance and built-in potential.