Wet-Chemically Prepared MO Layers as Hole Transport Layer in the Inverted Organic Solar Cell

摘要

One of the clean alternative energy sources attracting particular attention is solar cells, which can convert the solar light directly to electricity. Diverse solar cells have been developed so far, and particularly, organic solar cells (OSCs) have been attracting much attention due to their low cost as well as potential applications in flexible energy conversion devices. OSCs with power conversion efficiency (PCE) of 5-6% have been recently developed by several research groups. One of well-known disadvantages of OSCs is its very low stability under atmospheric pressure conditions: the performance of the OSCs can stand only for several days. In order to improve the stability of OSCs, inverted structures of OSCs have been developed. In contrast to the conventional structure, in which holes are injected into the transparent conducting electrode (TCE), electrons are directed towards TCE. Inorganic semiconducting materials such as TiO2 or ZnO deposited on the Indium Tin Oxide (ITO) electrode can be used as buffer layer for accepting electrons, which can also significantly increase the stability of inverted OSCs (IOSCs).