A large interconnecting network within hybrid MEH-PPV/TiO_2 nanorod photovoltaic devices

摘要

This is a study of hybrid photovoltaic devices based on TiO_2 nanorods and poly[2-methoxy-5-(2'-ethyl-hexyloxy)-l,4-phenylene vinylene] (MEH-PPV). We use TiO_2 nanorods as the electron acceptors and conduction pathways. Here we describe how to develop a large interconnecting network within the photovoltaic device fabricated by inserting a layer of HO_2 nanorods between the MEH-PPV:TiO_2 nanorod hybrid active layer and the aluminium electrode. The formation of a large interconnecting network provides better connectivity to the electrode, leading to a 2.5-fold improvement in external quantum efficiency as compared to the reference device without the TiO_2 nanorod layer. A power conversion efficiency of 2.2 percent under illumination at 565 nm and a maximum external quantum efficiency of 24 percent at 430 nm are achieved. A power conversion efficiency of 0.49 percent is obtained under Air Mass 1.5 illumination.