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

被引：105

作者：

Hoque, Md Nadim Ferdous ^{[1
,2
]}

Yang, Mengjin ^{[3
]}

Li, Zhen ^{[3
]}

Islam, Nazifah ^{[1
,2
]}

Pan, Xuan ^{[4
]}

Zhu, Kai ^{[3
]}

Fan, Zhaoyang ^{[1
,2
]}

机构：

[1] Texas Tech Univ, Dept Elect & Comp Engn, Lubbock, TX 79409 USA

[2] Texas Tech Univ, Nano Tech Ctr, Lubbock, TX 79409 USA

[3] Natl Renewable Energy Lab, Chem & Nanosci Ctr, Golden, CO 80401 USA

[4] Beijing Inst Hydrogeol & Engn Geol, Beijing 100195, Peoples R China

来源：

ACS ENERGY LETTERS | 2016年 / 1卷 / 01期

基金：

美国国家科学基金会;

关键词：

ANOMALOUS HYSTERESIS; PEROVSKITE; CH3NH3PBI3; 1ST-PRINCIPLES; TRANSPORT; ORIGIN;

D O I：

10.1021/acsenergylett.6b00093

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Researchers have debated whether methylammonium lead iodide (MAPbI(3)), 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 MAPbI(3) 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 degrees 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 MAPbI(3). This study contributes to the understanding performance of hybrid perovskites.

引用

页码：142 / 149

页数：8

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