Abstract

Polymer solar cells (PSCs) have been one of the most promising replacement energy to fossil fuels. In recent years, since inverted PSCs with perfect stability have been reported, how to improve efficiency becomes the key issue of PSCs technology commercialization. Nowadays, many low-bandgap polymers were synthesized and applied to PSCs in order to enhance the harvest of infrared solar radiation. However, since the short carrier diffusion length, the absorption is hard to further increase by simply changing the active ink recipe and the layer thickness without sacrificing carrier transport efficiency. In addition, carriers generated from photovoltaic effect are hard to collect.

© 2013 Japan Society of Applied Physics, Optical Society of America