Additive-assisted defect passivation of perovskite with metformin hydrochloride: toward high-performance p-i-n perovskite solar cells. (1st October 2022)

• Record Type: Journal Article
• Authors: Huang, Zhezhi; Fu, Jianfei; Ji, Wenxi; Zhang, Longgui; Chen, Qiaoyun; Zhang, Zelong; Zhou, Yi; Song, Bo
• Is Part Of: JPhys energy. Volume 4:Number 4(2022)
• Publication Date: 2022-10-01
• Subjects: additives -- metformin hydrochloride -- perovskite solar cells -- defect passivation; Power resources -- Research -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1088/2515-7655/ac975a
• Languages: English
• ISSNs: 2515-7655

Abstract

Abstract: Defects at the grain boundaries and surfaces of perovskite thin films are the key factors that cause nonradiative recombination, thus restricting the performance of perovskite solar cells (Pero-SCs). By introducing foreign additives to manage the chemical environment of the precursor, perovskite films can obtain optimized morphology and reduced defects, thereby enhancing the photovoltaic performance and stability of derived Pero-SCs. Herein, we report the bifunctional molecule metformin hydrochloride (MetHCl), whose multidentate structure is capable of simultaneously passivating several sorts of defects in perovskite films. Concurrently, the strong binding ability to Pb 2+ makes it impressive in regulating perovskite crystallization. The nonvolatile MetHCl can remain in the perovskite film, contributing to acquiring a high-quality film with denser grains and fewer pinholes. Finally, p-i-n Pero-SCs containing the MetHCl additive exhibited enhanced stability and achieved a champion power conversion efficiency of 21.59% with an open-circuit voltage of 1.17 V.