聚合物
材料科学
分子
光伏系统
光化学
质谱法
电离
解吸
接受者
化学
物理化学
有机化学
吸附
生态学
离子
物理
生物
色谱法
凝聚态物理
作者
Ruizhi Lv,Shizhe Geng,Shuixing Li,Fei Wu,Yaokai Li,Thomas Rieks Andersen,Yuhao Li,Xinhui Lu,Mingjun Shi,Hongzheng Chen
出处
期刊:Solar RRL
[Wiley]
日期:2020-08-09
卷期号:4 (10)
被引量:29
标识
DOI:10.1002/solr.202000286
摘要
Although benzoazole‐fused rings with strong quinoid character have successfully been used to construct high‐performance small‐molecule non‐fullerene acceptors (NFAs), studies into how these units influence the stabilities of NFAs and their corresponding device performances are few to date. To address it, four new NFAs, SSTI, SNTI, NTI and NTTI, which adopt BBT, TBZ, and BTAZ as the cores, respectively, are designed and investigated. It is found that SSTI and SNTI based on BBT and TBZ cores with stronger quinoid resonance effects show features of more red‐shifted absorptions and deeper energy levels, but worse thermal and light stabilities than NTI and NTTI with a BTAZ core, especially in solutions and/or films blended with polymer donors. Through matrix‐assisted laser desorption ionization time of flight mass spectrometry analysis of the degradation products, it is disclosed that the CC double bond cleavage would be accelerated by stronger quinoid effects. Therefore, NTI and NTTI with relatively weaker quinoid characteristics show improved photovoltaic properties. Especially, NTTI based devices yield a good efficiency of 8.61% as the side chains on sp3‐hybrid C atoms can prevent the formation of large aggregates. These findings can provide invaluable knowledge for the molecular design of NFAs with both high‐efficiency and high‐stability
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