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Single-Junction Organic Solar Cell with over 15% Efficiency Using Fused-Ring Acceptor with Electron-Deficient Core

2019; Elsevier BV; Volume: 3; Issue: 4 Linguagem: Inglês

10.1016/j.joule.2019.01.004

2542-4785

Jun Yuan, Yunqiang Zhang, Liuyang Zhou, Guichuan Zhang, Hin‐Lap Yip, Tsz‐Ki Lau, Xinhui Lu, Can Zhu, Hongjian Peng, Paul A. Johnson, Mario Leclerc, Yong Cao, Jacek Ulański, Yongfang Li, Yingping Zou,

Silicon and Solar Cell Technologies

Summary Recently, non-fullerene n -type organic semiconductors have attracted significant attention as acceptors in organic photovoltaics (OPVs) due to their great potential to realize high-power conversion efficiencies. The rational design of the central fused ring unit of these acceptor molecules is crucial to maximize device performance. Here, we report a new class of non-fullerene acceptor, Y6, that employs a ladder-type electron-deficient-core-based central fused ring (dithienothiophen[3.2-b]- pyrrolobenzothiadiazole) with a benzothiadiazole (BT) core to fine-tune its absorption and electron affinity. OPVs made from Y6 in conventional and inverted architectures each exhibited a high efficiency of 15.7%, measured in two separate labs. Inverted device structures were certified at Enli Tech Laboratory demonstrated an efficiency of 14.9%. We further observed that the Y6-based devices maintain a high efficiency of 13.6% with an active layer thickness of 300 nm. The electron-deficient-core-based fused ring reported in this work opens a new door in the molecular design of high-performance acceptors for OPVs.