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Pressure-Induced Phase Transitions and Bandgap-Tuning Effect of Methylammonium Lead Iodide Perovskite

Published online by Cambridge University Press:  05 February 2018

Shaojie Jiang ,
Yanan Fang ,
Ruipeng Li ,
Timothy J. White ,
Zhongwu Wang ,
Tom Baikie  and
Jiye Fang
Shaojie Jiang
Affiliation:
Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York13902, USA;
Yanan Fang
Affiliation:
Energy Research Institute@NTU, School of Materials Science and Engineering, Nanyang Technological University, Republic of Singapore;
Ruipeng Li
Affiliation:
Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York14853, USA
Timothy J. White
Affiliation:
Energy Research Institute@NTU, School of Materials Science and Engineering, Nanyang Technological University, Republic of Singapore;
Zhongwu Wang
Affiliation:
Cornell High Energy Synchrotron Source, Cornell University, Ithaca, New York14853, USA
Tom Baikie
Affiliation:
Energy Research Institute@NTU, School of Materials Science and Engineering, Nanyang Technological University, Republic of Singapore;
Jiye Fang*
Affiliation:
Materials Science and Engineering Program, State University of New York at Binghamton, Binghamton, New York13902, USA;
*
*(Email: jfang@binghamton.edu)
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Abstract

Pressure-induced crystallographic transitions and optical behavior of MAPbI3 (MA=methylammonium) were investigated using in-situ synchrotron X-ray diffraction and laser-excited photoluminescence spectroscopy. We observed that the tetragonal phase that presents under ambient pressure transformed to a ReO3-type cubic phase at 0.3 GPa, which further converted into a putative orthorhombic structure at 2.7 GPa. The sample was finally separated into crystalline and amorphous fractions beyond 4.7 GPa. During the decompression, the phase-mixed material restored the original structure in two distinct pathways depending on the peak pressures. Being monitored using a laser-excited photoluminescence technique under each applied pressure, it was determined that the bandgap reduced with an increase of the pressure till 0.3 GPa and then enlarged with an increase of the pressure up to 2.7 GPa. This work lays the foundation for understanding pressure-induced phase transitions and bandgap tuning of MAPbI3, enriching potentially the toolkit for engineering perovskites related photovoltaic devices.

Keywords

phase transformationphotovoltaicx-ray diffraction (XRD)
Type
Articles
Information
MRS Advances , Volume 3 , Issue 32: Energy and Sustainability , 2018 , pp. 1825 - 1830
Copyright
Copyright © Materials Research Society 2018 

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