Hybrid Perovskite Phase Transition and Its Ionic, Electrical and Optical Properties

Md Nadim Ferdous Hoque, Nazifah Islam, Kai Zhu, Zhaoyang Fan

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Hybrid perovskite solar cells (PSCs) under normal operation will reach a temperature above ∼ 60 °C, across the tetragonal-cubic structural phase transition of methylammonium lead iodide (MAPbI3). Whether the structural phase transition could result in dramatic changes of ionic, electrical and optical properties that may further impact the PSC performances should be studied. Herein, we report a structural phase transition temperature of MAPbI3 thin film at ∼ 55 °C, but a striking contrast occurred at ∼ 45 °C in the ionic and electrical properties of MAPbI3 due to a change of the ion activation energy from 0.7 eV to 0.5 eV. The optical properties exhibited no sharp transition except for the steady increase of the bandgap with temperature. It was also observed that the activation energy for ionic migration steadily increased with increased grain sizes, and reduction of the grain boundary density reduced the ionic migration.

Original languageEnglish (US)
Pages (from-to)3077-3082
Number of pages6
JournalMRS Advances
Volume2
Issue number53
DOIs
StatePublished - 2017
Externally publishedYes

Keywords

  • ionic conductor
  • phase transformation
  • photovoltaic

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics

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