Benzophosphole oxide and sulfide for thermally stable cathode buffer layers in organic thin-film photovoltaic devices

Abstract

Don't touch! Benzophosphole derrivatives, which have a high glass transition temperature and resistance to crystallization, are shown to be useful as cathode buffer materials for OPV devices. The benzophosphole-based devices showed an improvement in power conversion efficiency by annealing, which can be ascribed to the decrease in the contact resistance between the buffer layer and the adjoining layers. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.