Thermally Stable and Efficient Planar Perovskite Solar Cells through a Facile Surface Passivation Using a Novel IDTT-Based Small Molecule Additive
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Perovskite solar cells (PSCs) have been highlighted as next-generation energy source owing to their fascinating optoelectronic properties and solution processability. However, various defects existing in PSCs could adversely affect efficiency and stability, which have to be solved. Herein, a novel indacenodithieno[3,2-b]thiophene-based small molecule (SM) additive (IDTT-ThCz) was synthesized and introduced to perovskite film. IDTT-ThCz additive is capable of interacting with perovskite layer and performing a surface passivation, which supresses perovskite defects. Furthermore, this facile surface also improves the charge extraction capability, but also prevents perovskite degradation. As a result, IDTT-ThCz-treated PSCs achieved a power conversion efficiency (PCE) of 22.5% and retained 95% of its initial PCE after 500 h storage under thermal condition (85°C), representing remarkable efficiency as well as stability among the SM additives reported so far.