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Title: Ionic and Optical Properties of Methylammonium Lead Iodide Perovskite across the Tetragonal–Cubic Structural Phase Transition

Journal Article · · ChemSusChem
 [1];  [1];  [2];  [1];  [2];  [1]
  1. Department of Electrical and Computer Engineering and Nano Tech Center Texas Tech University Lubbock Texas 79409 USA
  2. Chemistry and Nanoscience Center National Renewable Energy Laboratory Golden Colorado 80401 USA

Abstract Practical hybrid perovskite solar cells (PSCs) must endure temperatures above the tetragonal–cubic structural phase transition of methylammonium lead iodide (MAPbI 3 ). However, the ionic and optical properties of MAPbI 3 in such a temperature range, and particularly, dramatic changes in these properties resulting from a structural phase transition, are not well studied. Herein, we report a striking contrast at approximately 45 °C in the ionic/electrical properties of MAPbI 3 owing to a change of the ion activation energy from 0.7 to 0.5 eV, whereas the optical properties exhibit no particular transition except for the steady increase of the bandgap with temperature. These observations can be explained by the “continuous” nature of perovskite phase transition. We speculate that the critical temperature at which the ionic/electrical properties change, although related to crystal symmetry variation, is not necessarily the same temperature as when tetragonal–cubic structural phase transition occurs.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC36-08-GO28308
OSTI ID:
1401009
Journal Information:
ChemSusChem, Journal Name: ChemSusChem Vol. 9 Journal Issue: 18; ISSN 1864-5631
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 50 works
Citation information provided by
Web of Science

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