Modification of SnO2 with Phosphorus‐Containing Lewis Acid for High‐Performance Planar Perovskite Solar Cells with Negligible Hysteresis. Issue 4 (16th December 2021)

• Record Type: Journal Article
• Authors: Hu, Yanqiang; He, Zhengyan; Jia, Xiangrui; Zhao, Wenkai; Zhang, Shufang; Jiao, MengMeng; Xu, Qinfeng; Wang, Dehua; Yang, Chuanlu; Yuan, Guoliang; Han, Liyuan
• Is Part Of: Solar RRL. Volume 6:Issue 4(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-16
• Subjects: electron transport layers -- interface modification -- lewis acids -- perovskite solar cells -- stability; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.202100942
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : Expeditious charge transfer at the interfaces between photoactive and charge transport layers is critical in perovskite solar cells (PSCs). Defects on the surface of charge transport layers usually lead to the degradation of carrier mobility, resulting in low power conversion efficiency (PCE) and serious hysteresis. Herein, phosphorus‐containing Lewis acids are applied to modify the SnO2 /perovskite interface and neutralize redundant OH − on the SnO2 surface. The interaction between the Lewis acids and SnO2 significantly accelerate the electron transfer and greatly reduce the energy barrier at the SnO2 /perovskite interface, boosting the PCE of the PSCs. By modifying the SnO2 /pervoskite interface with diphenylphosphine oxide, the PCE of a small area device was increased from 18.94% to 22.14%, along with negligible hysteresis and improved stability. Moreover, the 5 × 5 cm 2 solar modules with an aperture area of 22.56 cm 2 achieved a best efficiency of 15.69%. Abstract : A facile method is reported to passivate the SnO2 /perovskite interface and neutralize OH − on the SnO2 surface by modifying the SnO2 /pervoskite interface with phosphorus‐containing Lewis acids. The power conversion efficiency of the optimal device is increased from 18.94% to 22.14%, along with negligible hysteresis. Meanwhile, the corresponding solar modules also achieved a champion efficiency of 15.69% with excellent stability under continuous illumination.