Performance Enhancement of Inverted Cspbi2br Perovskite Solar Cells Via Butylammonium Cation Additive Modification

Abstract

Defects in all inorganic perovskite films currently limit the efficiency and long-term stability of perovskite solar cells (PSCs). In this study, we employed butylammonium cation as an additive to enhance the performance of PSCs. By incorporating butylammonium iodide, modifications in crystallization were achieved, resulting in high-quality CsPbI2Br perovskite films with larger grain sizes. As a result, the inverted PSCs with 1 mole percent additive exhibited an enhanced power conversion efficiency (PCE) of up to 13.0%, compared to the control PCE of 10.8%. The improvement can be primarily attributed to reduced trap states and suppressed charge recombination within the inverted PSCs. Furthermore, the hydrophobic nature of the additive noticeably improved the long-term stability of CsPbI2Br PSCs.

Keywords: Perovskite solar cell, CsPbI2Br perovskite, Defect passivation, Additive