Optical Gaps of Organic Solar Cells as a Reference for Comparing Voltage Losses

作者：Yuming Wang, Deping Qian, Yong Cui, Huotian Zhang, Jianhui Hou, Koen Vandewal, Thomas Kirchartz, Feng Gao · 发表于：Advanced Energy Materials · 年份：2018 · DOI：10.1002/aenm.201801352 · 被引用次数：446 · 研究领域：Organic Electronics and Photovoltaics、Conducting polymers and applications、Perovskite Materials and Applications

Abstract The voltage loss, determined by the difference between the optical gap ( E g ) and the open‐circuit voltage ( V OC ), is one of the most important parameters determining the performance of organic solar cells (OSCs). However, the variety of different methods used to determine E g makes it hard to fairly compare voltages losses among different material systems. In this paper, the authors discuss and compare various E g determination methods and show how they affect the detailed calculation of voltage losses, as well as predictions of the maximum achievable power conversion efficiency. The aim of this paper is to make it possible for the OSC community to compare voltage losses in a consistent and reasonable way. It is found that the voltage losses for strongly absorbed photons in state‐of‐the‐art OSCs are not much less than 0.6 V, which still must be decreased to further enhance efficiency.