Good vibrations in molecuiarly doped polymers: combining impedance and Raman spectroscopy to elucidate intermolecular interactions

摘要

Organic semiconductors offer many advantages for energy conversion, saving and storage applications. Low temperature and flexible processing of the semiconducting layer enables production at low cost and energy expenditure, and integration on non-heat resistant substrate materials such as plastics and textiles. A critical limitation of organic semiconductors in devices, however, is the poor electrical properties. To avoid substantial electrical losses, very thin active layers are applied in state-of-the-art solar cells. We recently demonstrated that the thin active layer (< 100 nm) in high performance polymer solar cells limits the maximum achievable photocurrent via limited absorption, and therefore the power conversion efficiency [1].