Polarization and Dielectric Study of Methylammonium Lead Iodide Thin Film to Reveal its Nonferroelectric Nature under Solar Cell Operating Conditions

Date

2016-05-20

Journal Title

Journal ISSN

Volume Title

Publisher

American Chemical Society

Abstract

Researchers have debated whether methylammonium lead iodide (MAPbI3), with a perovskite crystal structure, is ferroelectric and therefore contributes to the current-voltage hysteresis commonly observed in hybrid perovskite solar cells (PSCs). We thoroughly investigated temperature-dependent polarization, dielectric, and impedance spectroscopies, and we found no evidence of ferroelectric effect in a MAPbI3 thin film at normal operating conditions. Therefore, the effect does not contribute to the hysteresis in PSCs, whereas the large component of ionic migration observed may play a critical role. Our temperature-based polarization and dielectric studies find that MAPbI3 exhibits different electrical behaviors below and above ca. 45 oC, suggesting a phase transition around this temperature. In particular, we report the activation energies of ionic migration for the two phases and temperature-dependent permittivity of MAPbI3. This study contributes to understanding the material properties and device performance of hybrid perovskites.

Description

This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS ENergy Letters, copyright © American Chemical Society after peer review. To access the final edited and published work see http://dx.doi.org/10.1021/acsenergylett.6b00093.

Keywords

Perovskite, Ferroelectric crystals

Citation

Hoque, M. N. F., Yang, M., Li, Z., Islam, N., Pan, X., Zhu, K., & Fan, Z. (2016). Polarization and dielectric study of methylammonium lead iodide thin film to reveal its nonferroelectric nature under solar cell operating conditions. ACS Energy Letters, 1(1), 142-149. https://doi.org/10.1021/acsenergylett.6b00093

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