Ionic and Optical Properties of Methylammonium Lead Iodide Perovskite across its Tetragonal-Cubic Structural Phase Transition

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, whether the structural phase transition could result in dramatic changes in these properties, are not well studied. Herein, we report a striking contrast at ~45 oC in the ionic/electrical properties of MAPbI3 due to a change of the ion activation energy from 0.7 eV 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 when tetragonal-cubic structural phase transition occurs.

Description

This is the peer reviewed version of the following article: Hoque, M. N. F., Islam, N., Li, Z., Ren, G., Zhu, K., & Fan, Z. (2016). Ionic and Optical Properties of Methylammonium Lead Iodide Perovskite across the Tetragonal–Cubic Structural Phase Transition. ChemSusChem, 9(18), 2692-2698., which has been published in final form at https://doi.org/10.1002/cssc.201600949. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

Keywords

Perovskite, Phase transitions (Statistical physics)

Citation

Hoque, M. N. F., Islam, N., Li, Z., Ren, G., Zhu, K., & Fan, Z. (2016). Ionic and Optical Properties of Methylammonium Lead Iodide Perovskite across the Tetragonal–Cubic Structural Phase Transition. ChemSusChem, 9(18), 2692-2698.

Collections