Frontiers in Chemistry (Apr 2020)

Introducing Porphyrin Units by Random Copolymerization Into NDI-Based Acceptor for All Polymer Solar Cells

  • Jinliang Liu,
  • Mengzhen Li,
  • Dong Chen,
  • Bin Huang,
  • Qiannan He,
  • Shanshan Ding,
  • Wenquan Xie,
  • Feiyan Wu,
  • Lie Chen,
  • Yiwang Chen,
  • Yiwang Chen

DOI
https://doi.org/10.3389/fchem.2020.00310
Journal volume & issue
Vol. 8

Abstract

Read online

Naphthalene diimide (NDI)-based polymer N2200 is a promising organic polymer acceptor for all-polymer solar cells (all-PSCs), but its inherent shortcomings like poor extinction coefficient and strong aggregation limit further performance optimization of all-PSCs. Here, a series of random copolymers, PNDI-Px, were designed and synthesized by introducing porphyrin unit into NDI-based polymer as acceptors for all-PSCs. These random copolymers show a higher absorption coefficient and raised the lowest unoccupied molecular orbital (LUMO) energy levels compared to N2200. The crystallinity can also be fine-tuned by regulation of the content of porphyrin unit. The random copolymers are matched with polymer donor PBDB-T for the application in all-polymer solar cells. The best power conversion efficiency (PCE) of these PNDI-Px-based devices is 5.93%, ascribed to the overall enhanced device parameters compared with the N2200-based device. These results indicate that introducing porphyrin unit into polymer is a useful way to fine-tune the photoelectric performance for efficient all-PSCs.

Keywords