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 °C, 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 the understanding of the material properties and device performance of hybrid perovskites.

Description

Embargoed until May 2017

Keywords

Solar cells, Polarization, Electricity, Perovskite

Citation

Md Nadim Ferdous Hoque, Mengjin Yang, Zhen Li, Nazifah Islam, Xuan Pan, Kai Zhu, Zhaoyang Fan, “Polarization and Dielectric Study of Methylammonium Lead Iodide Thin Film to Reveal its Nonferroelectric Nature under Solar Cell Operating Conditions”, ACS Energy Letters, 1, 142–149 (2016). doi: 10.1021/acsenergylett.6b00093

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