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

Md Nadim Ferdous Hoque, Nazifah Islam, Zhen Li, Guofeng Ren, Kai Zhu, Zhaoyang Fan

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

Practical hybrid perovskite solar cells (PSCs) must endure temperatures above the tetragonal–cubic structural phase transition of methylammonium lead iodide (MAPbI3). However, the ionic and optical properties of MAPbI3 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 MAPbI3 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.

Original languageEnglish
Pages (from-to)2692-2698
Number of pages7
JournalChemSusChem
Volume9
Issue number18
DOIs
StatePublished - Sep 22 2016

Keywords

  • cubic
  • optoelectronic properties
  • perovskite
  • phase transition
  • tetragonal

Fingerprint Dive into the research topics of 'Ionic and Optical Properties of Methylammonium Lead Iodide Perovskite across the Tetragonal–Cubic Structural Phase Transition'. Together they form a unique fingerprint.

  • Cite this