Hyuntae Choi1,Dohyun Kim1,Taiho Park1
Pohang University of Science and Technology1
Hyuntae Choi1,Dohyun Kim1,Taiho Park1
Pohang University of Science and Technology1
Perovskite solar cells (PSCs) have received a lot of attention because of their fascinating optoelectronic features and solution processability, but they still have shortcomings that limit their efficiency and stability. Here, a new small molecule additive (IDTT-ThCz) based on indacenodithieno[3,2-b]thiophene that can interact with perovskite layers is designed. In particular, IDTT-ThCz is introduced into the perovskite layer to significantly suppress the perovskite defects through anti-solvent treatment. In addition, this facile surface passivation greatly improves the charge extraction ability, preventing perovskite degradation. As a result, IDTT-ThCz-treated PSCs showed enhanced power conversion efficiency (PCE) of 22.5% and superior thermal stability by maintaining 95% of the initial PCE after storage for 500 hours under thermal conditions (85°C).