Regulating Molecular Structure of S,N-Heteroacene Non-fullerene Acceptors to Achieve Efficient Photoelectric Properties

被引:0
|
作者
Liu, Mingtao [1 ]
Zhu, Peipei [1 ]
Lai, Shiting [1 ]
Zhang, Xiage [2 ]
Fu, Yuang [3 ]
Xue, Ling [1 ]
Liu, Dan [1 ]
Feng, Kui [2 ]
Lu, Xinhui [3 ]
Guo, Xugang [2 ]
Liao, Xunfan [1 ]
Chen, Yiwang [1 ]
机构
[1] Jiangxi Normal Univ, Coll Chem & Mat, Key Lab Fluorine & Silicon Energy Mat & Chem, Minist Educ, 99 Ziyang Ave, Nanchang 330022, Jiangxi, Peoples R China
[2] Southern Univ Sci & Technol SUSTech, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China
[3] Chinese Univ Hong Kong, Dept Phys, Kowloon, Hong Kong 999077, Peoples R China
基金
中国国家自然科学基金;
关键词
S; N-Heteroacene; Optoelectronic devices; High electron mobility; Ternary strategy; Regulate crystallinity; ORGANIC SOLAR-CELLS;
D O I
10.1002/cjoc.202400699
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The ternary strategy has demonstrated its efficacy in improving charge transport in organic solar cells (OSCs). Here, three novel non-fullerene acceptors, SN6C9-4F, SN6C9-4Cl and SN6C10-4F, based on S,N-heteroacene linear backbone were designed and synthesized. The three acceptors exhibit excellent molecular coplanarity, high crystallinity and possess a deep-lying lowest unoccupied molecular orbital energy level, which is beneficial for charge transport and injection in organic field-effect transistors (OFETs). Notably, the OFET devices based on all three acceptors achieved impressive electron mobilities, with SN6C10-4F achieving up to 0.73 cm(2)<middle dot>V-1<middle dot>s(-1), which is one of the highest values among A-D-A type small molecules. In addition, the OSCs device based on PBDB-T:SN6C9-4F exhibited the best power conversion efficiency of 12.07% owing to its optimal morphology and enhanced charge transport. Moreover, the incorporation of SN6C9-4F into the efficient PM6:L8-BO binary system to form ternary OSCs resulted in extended absorption range, enhanced donor crystallization, improved and more balanced charge transport, ultimately leading to an improvement of PCE from 17.78% to 18.32%. This study highlights the potential of developing acceptors with distinct structures from Y-series acceptors to broaden absorption and regulate donor crystallization, providing a novel approach to enhance the PCE of OSCs.
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页数:10
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