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Microstructural Evaluation of Phase Instability in Large Bandgap Metal Halide Perovskites

Authors
Kim, DohyungLim, JihooLee, SeungminSoufiani, Arman MahboubiChoi, EunyoungIevlev, Anton, VBorodinov, NikolayLiu, YongtaoOvchinnikova, Olga S.Ahmadi, MahshidLim, SeanSharma, PankajSeidel, JanNoh, Jun HongYun, Jae Sung
Issue Date
28-12월-2021
Publisher
AMER CHEMICAL SOC
Keywords
large bandgap perovskites; contact potential difference; inhomogeneity; phase instability; flat grains; ion migration; defects
Citation
ACS NANO, v.15, no.12, pp.20391 - 20402
Indexed
SCIE
SCOPUS
Journal Title
ACS NANO
Volume
15
Number
12
Start Page
20391
End Page
20402
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/139014
DOI
10.1021/acsnano.1c08726
ISSN
1936-0851
Abstract
The optoelectronic performance of organic-inorganic halide perovskite (OIHP)-based devices has been improved in recent years. Particularly, solar cells fabricated using mixed-cations and mixed-halides have outperformed their single-cation and single-halide counterparts. Yet, a systematic evaluation of the microstructural behavior of mixed perovskites is missing despite their known composition-dependent photoinstability. Here, we explore microstructural inhomogeneity in (FAPbI(3))(x)(MAPbBr(3))(1-x) using advanced scanning probe microscopy techniques. Contact potential difference (CPD) maps measured by Kelvin probe force microscopy show an increased fraction of grains exhibiting a low CPD with flat topography as MAPbBr(3) concentration is increased. The higher portion of low CPD contributes to asymmetric CPD distribution curves. Chemical analysis reveals these grains being rich in MA, Pb, and I. The composition-dependent phase segregation upon illumination, reflected on the emergence of a low-energy peak emission in the original photoluminescence spectra, arises from the formation of such grains with flat topology. Bias-dependent piezo-response force microscopy measurements, in these grains, further confirm vigorous ion migration and cause a hysteretic piezo-response. Our results, therefore, provide insights into the microstructural evaluation of phase segregation and ion migration in OIHPs pointing toward process optimization as a mean to further enhance their optoelectronic performance.
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