A conjugated donor-acceptor block copolymer enables over 11% efficiency for single-component polymer solar cells

作者：Wu, Yao; Guo, Jing; Wang, Wei; Chen, Zhihao; Chen, Zeng; Sun, Rui; Wu, Qiang; Wang, Tao; Hao, Xiaotao; Zhu, Haiming; Min, Jie^*

来源：Joule, 2021, 5(7): 1800-1815.

DOI：10.1016/j.joule.2021.05.002

• PERFORMANCE
• STABILITY
• PHOTOVOLTAICS
• SEPARATION
• FULLERENE

Covalently linking donor (D) and acceptor (A) moieties into single material can be an effective strategy to enable efficient exciton dissociation and charge generation. Herein, we synthesized a conjugated D-A block copolymer (PBDB-T-b-PYT), in which a donor block (PBDB-T) was connected to an acceptor block (PYT), Compared with the bulk heterojunction (BHJ) blend mixture containing PBDB-T and PYT with high molecular weights, more efficient exciton dissociation and charge transfer (CT) were observed in the single-component PBDB-T-b-PYT films. Impressively, a single-material organic solar cell (SMOSC) fabricated from PBDB-T-b-PYT alone exhibited a power conversion efficiency (PCE) of 11.32% and a certificated PCE of 10.8%. In addition, higher morphological stability and lower energy loss were also observed in the PBDB-T-b-PYT SMOSC compared with the control PBDB-T:PYT BHJ devices. The results manifest that our newly designed PBDB-T-b-PYT provides a promising design strategy for D-A block copolymers for highly efficient and stable SMOSCs.

• 单位
  Zhejiang University; Wuhan University; Zhengzhou University; Shandong University