The Influence of Surfactants on Perovskite Precursor Solution and Photovoltaic Performance

다국어 초록 (Multilingual Abstract)

Perovskite solar cells (PSCs) unique optoelectronics properties, reaching over 25% power conversion efficiencies (PCEs) with relatively cost-effective solution process. These solution fabrication methods form perovskite polycrystalline, which is inevitably accompanied by defects. These defects cause a critical problem of reducing photovoltaic properties in low-light condition. To passivate defects, quaternary ammonium halides (QAHs) with a structure of NR4+X- can efficiently passivate positive and negative charged defects in perovskite film. In perovskite precursor solution adding QAHs, the perovskite colloidal size was reduced and colloidal stability was improved, result to uniform film formation and enhanced perovskite crystal quality. As a result, perovskite solar cell with QAHs exhibits reduced defect density and enhanced photovoltaic performance in low-light illumination.