有机太阳能电池
小分子
有机分子
分子
材料科学
化学
纳米技术
有机化学
生物化学
聚合物
作者
Huazhe Liang,Xingqi Bi,Hongbin Chen,Tengfei He,Yi Lin,Yunxin Zhang,Kun Ma,Wanying Feng,Zaifei Ma,Guankui Long,Chenxi Li,Bin Kan,Hongtao Zhang,Олег А. Ракитин,Xiangjian Wan,Zhaoyang Yao,Yongsheng Chen
标识
DOI:10.1038/s41467-023-40423-6
摘要
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.
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