Current-Voltage Characteristics of Porphyrin/C₆₀ Multi-Layered Organic Photovoltaic Device with and without Hole Collection Oxide Films

Abstract

We investigated the photovoltaic properties of multi-layered devices consisting of ITO/oxide/Tetraphenyl porphyrin (H₂TPP)/Fullerene (C₆₀)/Bathocuproine (BCP)/Al structures. The V_OC markedly increases with the insertion of NiO and MoO₃ hole collection layers. However, the “kink” behaviors and temperature dependent properties are observed for the devices with and without MoO₃ especially for the thick H₂TPP film. We demonstrated the analysis of the photovoltaic properties using the Poole-Frenkel and Schottky models based on the dielectric behaviors of porphyrin and MoO₃ layers.