SEARCH

SEARCH BY CITATION

Keywords:

  • polymer solar cells;
  • side-chain isolation;
  • two-dimensional-conjugated polymers

Abstract

Thumbnail image of graphical abstract

A new two-dimensional-conjugated polymer (PBDTT3-TPA) containing benzodithiophene (BDT) and a side chain isolation comonomer is designed and synthesized. Interestingly, PBDTT3-TPA is compatible with higher lowest unoccupied molecular level (LUMO) acceptors of indene-C60 bisadduct (ICBA), and polymer solar cells based on PBDTT3-TPA/ICBA show an open-circuit voltage (VOC) of ca. 0.80 V and a power conversion efficiency of 2.48% under AM1.5G illumination of at 100 mW cm−2. Furthermore, the energy loss in the corresponding fullerene acceptor devices is discussed, and the increase in the observed VOC is explained quantitatively by the up-shifted LUMO energy of ICBA (0.17 eV) and the reduced saturation current (JSO) in the blends.