Achieving over 18 % Efficiency Organic Solar Cell Enabled by a ZnO‐Based Hybrid Electron Transport Layer with an Operational Lifetime up to 5 Years
Shitong Li, Qiang Fu, Lingxian Meng, Xiangjian Wan, Liming Ding, Guanyu Lu, Guanghao Lu, Zhaoyang Yao, Chenxi Li, Yongsheng Chen
Abstract
Abstract Although organic solar cells (OSCs) have delivered an impressive power conversion efficiency (PCE) of over 19 %, most of them demonstrated rather limited stability. So far, there are hardly any effective and universal strategies to improve stability of state‐of‐the‐art OSCs. Herein, we developed a hybrid electron‐transport layer (ETL) in inverted OSCs using ZnO and a new modifying agent (NMA), and significantly improved the stability and PCEs for all the tested devices. In particular, when applied in the D18 : N3 system, its inverted OSC exhibits so far the highest PCE (18.20 %) among inverted single‐junction OSCs, demonstrating an extrapolated T 80 lifetime of 7572 h (equivalent to 5 years under outdoor exposure). This is the first report with T 80 over 5000 h among OSCs with over 18 % PCE. Furthermore, a high PCE of 16.12 % can be realized even in a large‐area device (1 cm 2 ). This hybrid ETL strategy provides a strong stimulus for highly prospective commercialization of OSCs.