Optimizing side chains on different nitrogen aromatic rings achieving 17％ efficiency for organic photovoltaics

• 作者: Zhe Li Can Zhu Jun Yuan Liuyang Zhou Wei Liu Xinxin Xia Juan Hong Honggang Chen Qingya Wei Xinhui Lu Yongfang Li Yingping Zou
• 来源期刊: 能源化学
• 年，卷（期）: 2022,（2）
• 页码范围: 173-178
• 页数: 6页
• 语种: 英文

摘要

Balancing charge generation and low energy loss (Eloss),especially in the wide spectral absorption region is critical to obtain high-performance organic photovoltaics (OPVs).Therefore,Y11-M and Y11-EB are designed and synthesized through modifying alkyl chains on different nitrogen aromatic rings of the reported non-fullerene acceptor Y11.Although all the molecules have almost similar low band-gap(around 1.30 eV),Y11-M and Y11-EB exhibit wider absorption in 410-870 nm region.Eventually,the conventional devices based on Y11-M and Y11-EB possess more efficient charge generation with low Eloss (around 0.44 eV),In addition,outstanding efficiencies of 16,64％ and 17,15％ with the fill factor of 76.15％ and 74.73％ are obtained in PM6:Y11-M and PM6:Y11-EB-based devices,both higher than Y11:PM6.The results highlight the importance of rational alkyl chains optimization,and a good structure-property relationship is established as well.