Clothing CsPbI3 perovskite in a robust phase-pure armor to boost the thermal stability. Issue 4 (5th January 2023)

• Record Type: Journal Article
• Authors: Tan, Xue; Wang, Shubin; Zhang, Qixian; Wang, Hailiang; Liu, Huicong; Li, Weiping; Zhu, Liqun; Song, Tinglu; Cui, Zhenhua; Bai, Yang; Chen, Haining
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 4(2023)
• Page Start: 1920
• Page End: 1926
• Publication Date: 2023-01-05
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta09095c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The intermediate treatment (IT) strategy was developed to clothe the CsPbI3 perovskite in a robust phase-pure armor to boost its thermal stability. Abstract : Phase instability seriously hinders the application of inorganic CsPbI3 perovskite solar cells (PSCs), especially under elevated temperature. Herein, we developed a novel strategy, namely intermediate treatment (IT), to clothe the CsPbI3 perovskite in a robust phase-pure armor to boost its thermal stability. During the IT process, instead of the post-treatment (PT) of the CsPbI3 perovskite, the quinuclidin-1-ium iodide (QCDI) solution was employed to treat the intermediate phase DMAPbI3 . At the following annealing stage, a thin but robust 1D QCDPbI3 outer layer was formed via ion exchange between the QCD + and DMA + ions. Such outer layer stabilized the CsPbI3 perovskite phase well by serving as a protecting layer and reducing the grain size. As a result, the IT-CsPbI3 perovskite maintained black phase after heating at 85 °C for 120 h, while the pristine CsPbI3 film deteriorated seriously after 24 h. The IT-CsPbI3 PSCs based on a carbon electrode (C-PSCs) retained over 85% of the initial efficiency after 200 h of heating at 85 °C in an N2 glovebox and maintained almost unchanged efficiency in dry air for 150 days. In addition, the IT strategy improved the film morphology well and passivated the defect states effectively. Consequently, the IT-CsPbI3 C-PSC achieved a record efficiency (16.64%) among inorganic C-PSCs.