Guest electron-accepting polymer doping enables green solvent-processed all-polymer solar cells with 16.37% efficiency

作者：Li, Zhenye^*; Liang, Yingfang; Chen, Lin; Chen, Jian; Peng, Feng; Ying, Lei^*

来源：Chemical Engineering Journal, 2023, 452: 139228.

DOI：10.1016/j.cej.2022.139228

• All-polymer solar cells
• Non-halogenated solvent
• Polymer doping
• Stability

The development of polymerized small molecule acceptors (PSMA) has pushed all-polymer solar cells (all-PSCs) to break through power conversion efficiency (PCE) of 16-17%. However, these PCEs are obtained by halogenated solvents processing, which will cause serious harm to the environment and human health. To make the PSMA-based all-PSCs suitable for non-halogenated solvent processing, we introduced PZT into a typical highefficiency all-PSCs system based on PBDB-T:PYF-T, to improve the solubility of PYF-T in non-halogenated solvent toluene (TL). PZT and PYF-T worked in an alloy-like model due to excellent miscibility induced by the similar molecular structure. A top PCE of 16.37% was obtained for TL-processed all-PSCs based on PBDB-T:PYFT:PZT, which represented the highest PCE value for all-PSCs processed by non-halogenated solvents. In addition, the doping of PZT can significantly improve the ambient processing stability, photo-stability and thermalstability of TL-processed all-PSCs, proving that polymer doping strategy enables all-PSCs compatible for practical applications.