A rare case of brominated small molecule acceptors for high-efficiency organic solar cells

Huazhe Liang, Xingqi Bi, Hongbin Chen, Tengfei He, Yi Lin, Yunxin Zhang, Kangqiao Ma, Wanying Feng, Zaifei Ma, Guankui Long, Chenxi Li, Bin Kan, Hongtao Zhang, Oleg A. Rakitin, Xiangjian Wan, Zhaoyang Yao () and Yongsheng Chen ()
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Huazhe Liang: Nankai University
Xingqi Bi: Nankai University
Hongbin Chen: Nankai University
Tengfei He: Nankai University
Yi Lin: Donghua University
Yunxin Zhang: Nankai University
Kangqiao Ma: Nankai University
Wanying Feng: Nankai University
Zaifei Ma: Donghua University
Guankui Long: Nankai University
Chenxi Li: Nankai University
Bin Kan: Nankai University
Hongtao Zhang: Nankai University
Oleg A. Rakitin: Russian Academy of Sciences
Xiangjian Wan: Nankai University
Zhaoyang Yao: Nankai University
Yongsheng Chen: Nankai University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Given that bromine possesses similar properties but extra merits of easily synthesizing and polarizing comparing to homomorphic fluorine and chlorine, it is quite surprising very rare high-performance brominated small molecule acceptors have been reported. This may be caused by undesirable film morphologies stemming from relatively larger steric hindrance and excessive crystallinity of bromides. To maximize the advantages of bromides while circumventing weaknesses, three acceptors (CH20, CH21 and CH22) are constructed with stepwise brominating on central units rather than conventional end groups, thus enhancing intermolecular packing, crystallinity and dielectric constant of them without damaging the favorable intermolecular packing through end groups. Consequently, PM6:CH22-based binary organic solar cells render the highest efficiency of 19.06% for brominated acceptors, more excitingly, a record-breaking efficiency of 15.70% when further thickening active layers to ~500 nm. By exhibiting such a rare high-performance brominated acceptor, our work highlights the great potential for achieving record-breaking organic solar cells through delicately brominating.

Date: 2023
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DOI: 10.1038/s41467-023-40423-6

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