Reversible Phase Transition for Durable Formamidinium-Dominated Perovskite Photovoltaics

Reversible Phase Transition for Durable Formamidinium-Dominated Perovskite Photovoltaics

© 2022 Wiley-VCH GmbH.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 34(2022), 39 vom: 02. Sept., Seite e2204458
1. Verfasser: Liu, Huifen (VerfasserIn)
Weitere Verfasser: Li, Nengxu, Chen, Zehua, Tao, Shuxia, Li, Chunlei, Jiang, Lang, Niu, Xiuxiu, Chen, Qi, Wang, Feng, Zhang, Yu, Huang, Zijian, Song, Tinglu, Zhou, Huanping
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2022
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article heat healing perovskite solar cells phase stability reversible phase transition
Beschreibung
Zusammenfassung:© 2022 Wiley-VCH GmbH.
Phase instability is one of the major obstacles to the wide application of formamidinium (FA)-dominated perovskite solar cells (PSCs). An in-depth investigation on relevant phase transitions is urgently needed to explore more effective phase-stabilization strategies. Herein, the reversible phase-transition process of FA1- x Csx PbI3 perovskite between photoactive phase (α phase) and non-photoactive phase (δ phase) under humidity, as well as the reversible healing of degraded devices, is monitored. Moreover, through in situ atomic force microscopy, the kinetic transition between α and δ phase is revealed to be the "nucleation-growth transition" process. Density functional theory calculation implies an enthalpy-driven α-to-δ degradation process during humidity aging and an entropy-driven δ-to-α healing process at high temperatures. The α phase of FA1- x Csx PbI3 can be stabilized at elevated temperature under high humidity due to the increased nucleation barrier, and the resulting non-encapsulated PSCs retain >90% of their initial efficiency after >1000 h at 60 °C and 60% relative humidity. This finding provides a deepened understanding on the phase-transition process of FA1- x Csx PbI3 from both thermodynamics and kinetics points of view, which also presents an effective means to stabilize the α phase of FA-dominated perovskites and devices for practical applications
Beschreibung:Date Revised 28.09.2022
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.202204458