Microstructural Evaluation of Phase Instability in Large Bandgap Metal Halide Perovskites
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 (FAPbI3)x(MAPbBr3)1–x using advanced scanning probe microscopy techniques. In this work, 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 MAPbBr3 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.
- Authors:
-
[1];
[2];
[4];
[4];
[4];
[5];
[6];
[2];
[2];
[3];
- Univ. of New South Wales, Sydney, NSW (Australia); Univ. of Tennessee, Knoxville, TN (United States)
- Univ. of New South Wales, Sydney, NSW (Australia)
- Korea Univ., Seoul, (Korea, Republic of)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
- Univ. of New South Wales, Sydney, NSW (Australia); Univ. of Surrey, Guildford (United Kingdom)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
- Sponsoring Org.:
- USDOE Office of Science (SC); Australian Centre for Advanced Photovoltaics; National Research Foundation of Korea (NRF)
- OSTI Identifier:
- 1883741
- Grant/Contract Number:
- AC05-00OR22725; NRF-2020R1A2C3009115
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Nano
- Additional Journal Information:
- Journal Volume: 15; Journal Issue: 12; Journal ID: ISSN 1936-0851
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; large bandgap perovskites; contact potential difference; inhomogeneity; phase instability; flat grains; ion migration; defects
Citation Formats
Kim, Dohyung, Lim, Jihoo, Lee, Seungmin, Soufiani, Arman Mahboubi, Choi, Eunyoung, Ievlev, Anton V., Borodinov, Nikolay, Liu, Yongtao, Ovchinnikova, Olga S., Ahmadi, Mahshid, Lim, Sean, Sharma, Pankaj, Seidel, Jan, Noh, Jun Hong, and Yun, Jae Sung. Microstructural Evaluation of Phase Instability in Large Bandgap Metal Halide Perovskites. United States: N. p., 2021.
Web. doi:10.1021/acsnano.1c08726.
Kim, Dohyung, Lim, Jihoo, Lee, Seungmin, Soufiani, Arman Mahboubi, Choi, Eunyoung, Ievlev, Anton V., Borodinov, Nikolay, Liu, Yongtao, Ovchinnikova, Olga S., Ahmadi, Mahshid, Lim, Sean, Sharma, Pankaj, Seidel, Jan, Noh, Jun Hong, & Yun, Jae Sung. Microstructural Evaluation of Phase Instability in Large Bandgap Metal Halide Perovskites. United States. https://doi.org/10.1021/acsnano.1c08726
Kim, Dohyung, Lim, Jihoo, Lee, Seungmin, Soufiani, Arman Mahboubi, Choi, Eunyoung, Ievlev, Anton V., Borodinov, Nikolay, Liu, Yongtao, Ovchinnikova, Olga S., Ahmadi, Mahshid, Lim, Sean, Sharma, Pankaj, Seidel, Jan, Noh, Jun Hong, and Yun, Jae Sung. Tue .
"Microstructural Evaluation of Phase Instability in Large Bandgap Metal Halide Perovskites". United States. https://doi.org/10.1021/acsnano.1c08726. https://www.osti.gov/servlets/purl/1883741.
@article{osti_1883741,
title = {Microstructural Evaluation of Phase Instability in Large Bandgap Metal Halide Perovskites},
author = {Kim, Dohyung and Lim, Jihoo and Lee, Seungmin and Soufiani, Arman Mahboubi and Choi, Eunyoung and Ievlev, Anton V. and Borodinov, Nikolay and Liu, Yongtao and Ovchinnikova, Olga S. and Ahmadi, Mahshid and Lim, Sean and Sharma, Pankaj and Seidel, Jan and Noh, Jun Hong and Yun, Jae Sung},
abstractNote = {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 (FAPbI3)x(MAPbBr3)1–x using advanced scanning probe microscopy techniques. In this work, 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 MAPbBr3 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.},
doi = {10.1021/acsnano.1c08726},
journal = {ACS Nano},
number = 12,
volume = 15,
place = {United States},
year = {Tue Nov 30 00:00:00 EST 2021},
month = {Tue Nov 30 00:00:00 EST 2021}
}
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