Regulation of the Miscibility of the Active Layer by Random Terpolymer Acceptors to Realize High-Performance All-Polymer Solar Cells

These results demonstrate that the simultaneous regulation of light absorption and miscibility between a donor and an acceptor by random copolymerization is a promising strategy to realize high-performance all-PSCs

Dong Chen; Siqi Liu; Jinliang Liu; Jihui Han; Lie Chen; Yiwang Chen

2021

Scholarcy highlights

  • The main limitations on the power conversion efficiency of all-polymer solar cells are the weak absorption coefficients of widely used naphthalene diimide-based polymer acceptors and the difficulty of morphology control
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  • It can be observed that random copolymerization of 2FT into the backbone can reduce the strong aggregation of the polymer and can produce more flexible main chains to favor closer contact and better miscibility with the crystalline donor PBDB-T relative to the N2200 bipolymer
  • A PBDB-T:PNDI-2FT-0.1-based device achieves a notable PCE of 9.46% with a short-circuit current of 16.62 mA cm–2
  • Note that both the PCE and JSC are the outstanding values in NDI-based all-PSCs
  • These results demonstrate that the simultaneous regulation of light absorption and miscibility between a donor and an acceptor by random copolymerization is a promising strategy to realize high-performance all-PSCs
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