The Impacts and Origins of A-site Instability in Formamidinium-Cesium Lead Iodide Perovskite Solar Cells under Extended Operation

Yanqi Luo, Nengxu Li, Zehua Chen, Xiuxiu Niu, Rishi E. Kumar, Junke Jiang, Huifen Liu, Oi Chen, Barry Lai, Geert Brocks, Tao Shuxia, Huanping Zhou, David P. Fenning

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Improved understanding of the origins of instability during photovoltaic operation of perovskite solar cell materials must be established to overcome barriers to commercialization. In this study, we analyze the microscopic mechanisms of degradation in high-performing methylammonium free (FA0.9Cs0.1PbI3) perovskite solar cells (PSC) over 600 hours of operation under stressors inherent to PV operation, including heat, illumination, and a load while excluding atmospheric effects by testing in a water-and oxygen-free atmosphere. While the PSCs exhibit reasonable thermal stability, they show considerable performance loss under constant illumination or stable power output. Synchrotron-based nanoprobe X-ray fluorescence and X-ray beam induced current (XRF/XBIC) measurements reveal segregation of current-blocking Cs-rich phases during stress testing. The decrease in performance correlates with the resulting number density of the Cs-rich clusters, which varies by stress condition. These findings unveil cation-dependent instability in FA0.9Cs0.1PbI3 perovskites and provide a framework for understanding the energy landscape in alloy perovskites to guide the engineering of long-lived halide perovskite devices.

Original languageEnglish
Title of host publication2020 47th IEEE Photovoltaic Specialists Conference, PVSC 2020
PublisherIEEE
Pages626-628
Number of pages3
ISBN (Electronic)9781728161150
DOIs
Publication statusPublished - 14 Jun 2020
Event47th IEEE Photovoltaic Specialists Conference, PVSC 2020 - Virtual Meeting, Canada
Duration: 15 Jun 202021 Aug 2020
Conference number: 47

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
Volume2020-June
ISSN (Print)0160-8371

Conference

Conference47th IEEE Photovoltaic Specialists Conference, PVSC 2020
Abbreviated titlePVSC 2020
CountryCanada
CityVirtual Meeting
Period15/06/2021/08/20

Keywords

  • Halide Perovskites
  • intrinsic stability
  • nano-XRF/XBIC
  • phase segregation

Fingerprint

Dive into the research topics of 'The Impacts and Origins of A-site Instability in Formamidinium-Cesium Lead Iodide Perovskite Solar Cells under Extended Operation'. Together they form a unique fingerprint.

Cite this