Low-bandgap small molecule acceptors with asymmetric side chains

作者：Zong, Guanhua; Li, Mingjie; Jin, Ke; Xu, Zhiwei; Zhang, Lixiu; Ma, Ning^*; Wang, Jilin^*; Wang, Guan-Wu^*; Xiao, Zuo^*; Ding, Liming

来源：Materials Chemistry Frontiers, 2022, 6(13): 1858-1864.

DOI：10.1039/d2qm00338d

• ORGANIC SOLAR-CELLS
• NONFULLERENE ACCEPTORS
• ELECTRON-ACCEPTOR
• END-GROUPS

Two low-bandgap ADA small molecule acceptors A1 and A2 with asymmetric out-of-plane side chains were synthesized. Different from previous studies, the asymmetric side chains of A1 and A2 were installed at the two sp(3) bridge-head carbons of the core unit, respectively. A1 and A2 show larger molecular dipole moments, stronger pi-pi interactions and higher electron mobilities than the symmetric counterpart S1, and exhibit higher miscibility with the donor L1-S. Higher power conversion efficiencies of 13.25% and 14.43% were achieved by L1-S:A1 and L1-S:A2 solar cells, respectively.

• 单位
  桂林理工大学; 中国科学院; 天津大学; 国家纳米科学中心