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

Journal Article · Thu Sep 01 04:00:00 EDT 2016 · ChemSusChem

DOI:https://doi.org/10.1002/cssc.201600949· OSTI ID:1326894

Hoque, Md Nadim Ferdous ^[1]; Islam, Nazifah ^[1]; Li, Zhen ^[2]; Ren, Guofeng ^[1]; Zhu, Kai ^[2]; Fan, Zhaoyang ^[1]

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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

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 degrees C in the ionic/electrical properties of MAPbl3 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.

• Research Organization: NREL (National Renewable Energy Laboratory (NREL), Golden, CO (United States))
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)
• DOE Contract Number: AC36-08GO28308
• OSTI ID: 1326894
• Report Number(s): NREL/JA-5900-67092
• Journal Information: ChemSusChem, Journal Name: ChemSusChem Journal Issue: 18 Vol. 9; ISSN 1864-5631
• Publisher: ChemPubSoc Europe
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
36 MATERIALS SCIENCE
cubic
optoelectronic properties
perovskite
phase transition
tetragonal