Affiliation:
1. Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion Science Center for Material Creation and Energy Conversion Institute of Frontier Chemistry School of Chemistry and Chemical Engineering Shandong University Qingdao 266237 China
2. College of New Energy Xi'an Shiyou University Xi'an Shaanxi 710065 China
3. Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong 99907 China
4. School of Microelectronics Fudan University Shanghai 200433 China
Abstract
AbstractSimple chemical structure and simplified synthesis process of active layer materials are critical for advancing the practical application of organic solar cells. Herin, two completely non‐fused ring electron acceptors BTZT‐2Cl and BTZT‐4Cl are developed. BTZT‐4Cl exhibits an enhanced absorption band, increases electrostatic potential differences with D18, and improves crystallinity and molecular packing properties. Consequently, the binary device based on BTZT‐4Cl displays a markedly improved efficiency of 14.12%, compared to the BTZT‐2Cl‐based device, which only achieves a moderate efficiency of 11.25%. More importantly, an alloy‐like structure can be formed by incorporating a small amount of high miscibility and compatibility BTZT‐2Cl. The ternary blend exhibits more compact molecular packing, efficient exciton dissociation, and an extended charge carrier lifetime due to the formation of an alloy‐like structure. The ternary device achieves a decent efficiency of 15.41% with superior thermal stability and a high T80 lifetime over 1600 h after being aged at 65 °C. These results establish it as the most efficient among devices based on completely non‐fused ring acceptors with both high efficiency and voltage. This study demonstrates a simple material design strategy and high‐performance device optimization techniques, which are critical for advancing practical applications in the OSC field.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Natural Science Foundation of Shandong Province
Cited by
5 articles.
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