Nanoscale Insights into Photovoltaic Hysteresis in Triple-Cation Mixed-Halide Perovskite Resolving the Role of Polarization and Ionic Migration

Nanoscale Insights into Photovoltaic Hysteresis in Triple-Cation Mixed-Halide Perovskite : Resolving the Role of Polarization and Ionic Migration

© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Bibliographische Detailangaben
Veröffentlicht in:Advanced materials (Deerfield Beach, Fla.). - 1998. - 31(2019), 36 vom: 15. Sept., Seite e1902870
1. Verfasser: Xia, Guozhan (VerfasserIn)
Weitere Verfasser: Huang, Boyuan, Zhang, Ying, Zhao, Xingyu, Wang, Chen, Jia, Chunmei, Zhao, Jinjin, Chen, Weiqiu, Li, Jiangyu
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2019
Zugriff auf das übergeordnete Werk:Advanced materials (Deerfield Beach, Fla.)
Schlagworte:Journal Article dynamic-strain-based scanning probe microscopy hysteresis ionic migration spontaneous polarization triple-cation mixed-halide perovskites
Beschreibung
Zusammenfassung:© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Triple-cation mixed-halide perovskites of composition Csx (FAy MA1- y )1 -x Pb(Iz Br1 -z )3 (CsFAMA) have been reported to possess excellent photovoltaic efficiency with minimal hysteresis; in this work, nanoscale insight is shed into the roles of illumination-induced polarization and ionic migration in photovoltaic hysteresis. By examining the concurrent evolution of ionic distribution and spontaneous polarization of CsFAMA under light illumination using dynamic-strain-based scanning probe microscopy, strong linear piezoelectricity arising from photoenhanced polarization is observed, while ionic migration is found to be not significantly increased by lightening. Nanoscale photocurrents are mapped under a series of biases using conductive atomic force microscopy, revealing negligible difference between forward and backward scans, and local IV curves reconstructed from principal component analysis show minimal hysteresis of just 1%. These observations at the nanoscale are confirmed in a macroscopic perovskite solar cell made of CsFAMA, exhibiting a high efficiency of 20.11% and with hysteresis index as small as 3%. Ionic migration, polarization, and photocurrent hysteresis are thus directly correlated at the nanoscale, and photoenhanced polarization in triple-cation mixed-halide perovskites is established, which does not contribute to the photovoltaic hysteresis
Beschreibung:Date Revised 01.10.2020
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1521-4095
DOI:10.1002/adma.201902870