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Multiple-stage structure transformation of organic-inorganic hybrid Perovskite CH3NH3PbI3

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Zhang, Y. (Y. ), Chen, Q., Kim, H. -S., Liu, Y., Yang, M., Yue, N., … Park, N. -G. (2016). Multiple-stage structure transformation of organic-inorganic hybrid Perovskite CH3NH3PbI3. Physical Review X. https://doi.org/doi:10.1103/PhysRevX.6.031042
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Description

By performing spatially resolved Raman and photoluminescence spectroscopy with varying excitation wavelength, density, and data acquisition parameters, we achieve a unified understanding towards the spectroscopy signatures of the organic-inorganic hybrid perovskite, transforming from the pristine state (CH3NH3PbI3) to the fully degraded state (i.e., PbI2) for samples with varying crystalline domain size from mesoscopic scale (approximately 100 nm) to macroscopic size (centimeters), synthesized by three different techniques. We show that the hybrid perovskite exhibits multiple stages of structure transformation occurring either spontaneously or under light illumination, with exceptionally high sensitivity to the illumination conditions (e.g., power, illumination time, and interruption pattern). We highlight four transformation stages (stages I–IV, with stage I being the pristine state) along either the spontaneous or photoinduced degradation path exhibiting distinctly different Raman spectroscopy features at each stage, and point out that previously reported Raman spectra in the literature reflect highly degraded structures of either stage III or stage IV. Additional characteristic optical features of partially degraded materials under the joint action of spontaneous and photodegradation are also given. This study offers reliable benchmark results for understanding the intrinsic material properties and structure transformation of this unique category of hybrid materials, and the findings are pertinently important to a wide range of potential applications where the hybrid material is expected to function in greatly different environment and light-matter interaction conditions.

Details
Title

Multiple-stage structure transformation of organic-inorganic hybrid Perovskite CH3NH3PbI3

Author(s)

Zhang, Y. (Yong), 1960-
Chen, Qiong
Kim, Hui-Seon
Liu, Yucheng
Yang, Mengjin
Yue, Naili
Ren, Gang
Zhu, Kai
Lu, Shengzhong
Park, Nam-Gyu

UNC Charlotte Affiliate Type

Faculty

Extent

1 online resource

Date Published

2016

Material Type

Journal article

Genre

articles

Resource Type

text

Abstract

By performing spatially resolved Raman and photoluminescence spectroscopy with varying excitation wavelength, density, and data acquisition parameters, we achieve a unified understanding towards the spectroscopy signatures of the organic-inorganic hybrid perovskite, transforming from the pristine state (CH3NH3PbI3) to the fully degraded state (i.e., PbI2) for samples with varying crystalline domain size from mesoscopic scale (approximately 100 nm) to macroscopic size (centimeters), synthesized by three different techniques. We show that the hybrid perovskite exhibits multiple stages of structure transformation occurring either spontaneously or under light illumination, with exceptionally high sensitivity to the illumination conditions (e.g., power, illumination time, and interruption pattern). We highlight four transformation stages (stages I–IV, with stage I being the pristine state) along either the spontaneous or photoinduced degradation path exhibiting distinctly different Raman spectroscopy features at each stage, and point out that previously reported Raman spectra in the literature reflect highly degraded structures of either stage III or stage IV. Additional characteristic optical features of partially degraded materials under the joint action of spontaneous and photodegradation are also given. This study offers reliable benchmark results for understanding the intrinsic material properties and structure transformation of this unique category of hybrid materials, and the findings are pertinently important to a wide range of potential applications where the hybrid material is expected to function in greatly different environment and light-matter interaction conditions.

Subjects--Topics

Physics
Perovskite

Is Part Of

Physical review X

Volume

6

Issue

3

ISSN

2160-3308

Beginning Page Number

031042-1

Ending Page Number

031042-20

Language

English

Published Version (Please cite this version)

doi:10.1103/PhysRevX.6.031042

Publisher's Version

https://doi.org/10.1103/PhysRevX.6.031042

Permalink

http://hdl.handle.net/20.500.13093/work:56

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