Ternary System with Controlled Structure: A New Strategy toward Efficient Organic Photovoltaics

• DOI: 10.1002/adma.201705243
• Publication Date: 2018-01-10T16:00:48Z
• Authors: Pei Cheng; Rui Wang; Jingshuai Zhu; Wenchao Huang; Sheng‐Yung Chang; Lei Meng; Pengyu Sun; Hao‐Wen Cheng; Meng Qin; Chenhui Zhu; Xiaowei Zhan; Yang Yang
• Keywords: 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Abstract Recently, a new type of active layer with ternary system has been developed to further enhance the performance binary organic photovoltaics (OPV). In OPV, almost all layers are formed by simple blend in solution, which eventually leads disordered bulk heterojunction (BHJ) structure after spin‐coating process. There two main restrictions this BHJ obtain higher OPV. One is isolated second donor or acceptor domains. The other invalid metal–semiconductor contact. Herein, concept and design donor/acceptor/acceptor OPV more controlled (C‐ternary) reported. C‐ternary fabricated sequential solution process, donor/acceptor sequentially spin‐coated. After device optimization, power conversion efficiencies (PCEs) enhanced 14–21% relative those blend; best PCEs 10.7 11.0% for fullerene‐based fullerene‐free solar cells, respectively. Moreover, averaged PCE value 10.4% cell measured study great agreement certified one 10.32% obtained from Newport Corporation.