Mixed‐Organic‐Cation Tin Iodide for Lead‐Free Perovskite Solar Cells with an Efficiency of 8.12%. Issue 11 (14th July 2017)

• Record Type: Journal Article
• Authors: Zhao, Ziran; Gu, Feidan; Li, Yunlong; Sun, Weihai; Ye, Senyun; Rao, Haixia; Liu, Zhiwei; Bian, Zuqiang; Huang, Chunhui
• Is Part Of: Advanced science. Volume 4:Issue 11(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-07-14
• Subjects: cation mixing -- lead‐free -- perovskite solar cells -- power‐conversion efficiency -- tin‐based perovskites; Science -- Periodicals; 505
• DOI: 10.1002/advs.201700204
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: In this work, a fully tin‐based, mixed‐organic‐cation perovskite absorber (FA) x (MA)1− x SnI3 (FA = NH2 CH = NH2 +, MA = CH3 NH3 + ) for lead‐free perovskite solar cells (PSCs) with inverted structure is presented. By optimizing the ratio of FA and MA cations, a maximum power conversion efficiency of 8.12% is achieved for the (FA)0.75 (MA)0.25 SnI3 ‐based device along with a high open‐circuit voltage of 0.61 V, which originates from improved perovskite film morphology and inhibits recombination process in the device. The cation‐mixing approach proves to be a facile method for the efficiency enhancement of tin‐based PSCs. Abstract : For the first time, an efficiency of over 8% is achieved for tin‐based perovskite solar cells along with a high open‐circuit voltage of 0.61 V by utilizing (FA)0.75 (MA)0.25 SnI3 as the absorber. The cation‐mixing method is proven to effectively improve the morphology of tin‐based perovskite films and reduce recombination process in the devices.