Efficiency enhancement of dopant-free perovskite solar cells by employing fluoro-substituted electron donor–electron acceptor type polymeric hole-transporting materials

Abstract

For the conventional n-i-p perovskite solar cells (PVSCs), dopant-free hole-transporting polymers can be employed to achieve high device performances. Herein, two electron donor-electron acceptor (D-A) type conjugated polymers PBCz-BTz and...

Alkylsilyl-substituted benzodithiophene-based small molecules as promising hole-transport materials for perovskite solar cells

“…9,10 Therefore, HTMs should possess a well-aligned highest occupied molecular orbital (HOMO) with the valence band of the perovskite, high intrinsic charge mobility, and the ability to form high-quality coverage of the perovskite absorber. Recent studies have demonstrated the great potential of benzodithiophene (BDT)-based conjugated small molecules 11,12 and polymers 13,14 as HTMs due to several attractive features of the BDT unit. The rigid and planar BDT building block with two-dimensionally expanded π-systems enables tight stacking of molecules, which is favorable for achieving high charge mobility.…”