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Hybrid Perovskite Phase Transition and Its Ionic, Electrical and Optical Properties

Published online by Cambridge University Press:  13 June 2017

Md Nadim Ferdous Hoque
Affiliation:
Electrical & Computer Engineering, Texas Tech University, Lubbock, Texas, United States
Nazifah Islam
Affiliation:
Electrical & Computer Engineering, Texas Tech University, Lubbock, Texas, United States
Kai Zhu
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado, United States
Zhaoyang Fan*
Affiliation:
Electrical & Computer Engineering, Texas Tech University, Lubbock, Texas, United States
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Abstract

Hybrid perovskite solar cells (PSCs) under normal operation will reach a temperature above ∼ 60 °C, across the tetragonal-cubic structural phase transition of methylammonium lead iodide (MAPbI3). Whether the structural phase transition could result in dramatic changes of ionic, electrical and optical properties that may further impact the PSC performances should be studied. Herein, we report a structural phase transition temperature of MAPbI3 thin film at ∼ 55 °C, but a striking contrast occurred at ∼ 45 °C in the ionic and electrical properties of MAPbI3 due to a change of the ion activation energy from 0.7 eV to 0.5 eV. The optical properties exhibited no sharp transition except for the steady increase of the bandgap with temperature. It was also observed that the activation energy for ionic migration steadily increased with increased grain sizes, and reduction of the grain boundary density reduced the ionic migration.

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Copyright
Copyright © Materials Research Society 2017 

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