期刊
SOLAR RRL
卷 3, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201800332
关键词
benzotriazole; non-fullerene accetors; open-circuit voltage; organic solar cells; same-acceptor-strategy
资金
- National Key Research and Development Program of China [2017YFA0206600]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSWSLH033]
- National Natural Science Foundation of China (NSFC) [51473040, 51673048, 21875052, 21602040, 21504019, 51773046, 51873044]
To achieve efficient organic solar cells (OSCs), the design of promising non-fullerene small molecular acceptors (SMAs) is crucially important and the relationship between the chemical structure and optoelectronic properties needs to be further investigated. Herein, an A(2)-A(1)-D-A(1)-A(2) molecular skeleton is adopted to study the effect of end-capped A(2) groups containing different numbers of cyano units, where D and A(1) are fixed as indacenodithiophene (IDT) and benzotriazole (BTA) units, respectively. Utilizing the same-acceptor-strategy, three BTA-based SMAs, named as BTA701, BTA3, and BTA703, are paired with a BTA-based p-type polymer J71. The open-circuit voltage (V-OC) gradually decreases with the enhancement of electron-accepting ability of terminal A(2) units, from 1.32 V (BTA701) to 1.20 V (BTA3) and to 0.85 V (BTA703). The device J71:BTA3 eventually shows the best power conversion efficiency (PCE) of 8.60% with a V-OC up to 1.2 V because of the complementary light absorption, high and balanced hole and electron mobility, suitable phase separation, and crystallinity. This study indicates that appropriate cyano-containing units in BTA-based SMAs can effectively modulate the absorption, energy levels, charge mobility and surface free energy, which can provide valuable insights to the further design of SMAs. In addition, these results prove that the same-acceptor-strategy is simple and effective to realize a V-OC as high as 1.2V.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据