Low‐Cost Hydroxyacid Potassium Synergists as an Efficient In Situ Defect Passivator for High Performance Tin‐Oxide‐Based Perovskite Solar Cells

• Published in: Angewandte Chemie International Edition Vol. 62; no. 25; pp. e202302507 - n/a
• Main Authors: Dong, Wei, Zhu, Chenpu, Bai, Cong, Ma, Yue, Lv, Linfeng, Zhao, Juan, Huang, Fuzhi, Cheng, Yi‐Bing, Zhong, Jie
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 19.06.2023
• Edition: International ed. in English
• Subjects: Chemical Bath Deposition; Defect Passivation; Defects; Electron transport; Electron Transport Layer; Energy conversion efficiency; Maximum power tracking; Particle deposition; Perovskite; Perovskites; Photovoltaic cells; Photovoltaics; Potassium; Solar Cells; Tin dioxide; Perovskite; Chemical Bath Deposition; Electron Transport Layer; Defect Passivation; Solar Cells
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.202302507

Perovskite solar cells (PSCs) based on SnO2 electron transport layers have attracted extensive research due to their compelling photovoltaic performance. Herein, we presented an in situ passivation of SnO2 with low‐cost hydroxyacid potassium synergist during deposition to optimize the interface carrier extraction and transport for high power conversion efficiency (PCE) and stabilities of PSCs. The orbital overlap of the carboxyl oxygen with the Sn atom alongwith the homogenous nano‐particle deposition effectively suppresses the interfacial defects and releases the internal residual strains in the perovskite. Accordingly, a PCE of 24.91 % with a fill factor (FF) up to 0.852 is obtained for in situ passivated devices, which is one of the highest values for SnO2‐based PSCs. Moreover, the unencapsulated device maintained 80 % of its initial PCE at 80 °C over 600 h, 100 % PCE at ambient conditions for 1300 h, and 98 % after one week maximum power point tracking (MPPT) under continuous AM1.5G illumination. The researchers developed a novel in situ passivation of SnO2 with optimized SnO2/perovskite interfacial carrier extraction and transport for efficient and stable perovskite solar cells (PSCs). A champion power conversion efficiency (PCE) of 24.91 % and a champion fill factor (FF) up to 0.852 were obtained.