By extending the π-conjugation, PBBT-DT exhibits superior hole transport properties, and the corresponding PVSC shows a champion PCE of 19.12%.
PBCz-FBTz with fluoro-substituents exhibits superior hole transport properties and passivation effects to PBCz-BTz. The devices employing PBCz-FBTz as dopant-free hole-transporting material show a champion PCE of 20.71% with excellent stability.
Two fluorene-based dopant-free D–π–D type HTMs (V1 and V2) are designed. The perovskite solar cell with V1, which contains a methoxy-TPA donor moiety, achieves a PCE of 14% maintaining 75% of its initial efficiency for over 480 hours.
This review explores different paths to replace traditional HTMs, it discusses recent advancements in conjugated organic-HTMs, organic-SAMs and polymeric-HTMs, aiming to improve the efficiency and stability of lead and tin-based PSCs.
Fabrication strategies for high quality halide perovskite films in solar cells are reviewed from the aspects of intermediate engineering, reaction-controlled, additive-controlled, and mass-controlled crystal growth.