Suppressing Halide Segregation in Wide-Band-Gap Mixed-Halide Perovskite Layers through Post-Hot Pressing

Kwang Choi; Min Ju Jeong; Seungmin Lee; Ghaida Alosaimi; Jan Seidel; Jae Sung Yun; Jun Hong Noh

doi:10.1021/acsami.2c03492

Suppressing Halide Segregation in Wide-Band-Gap Mixed-Halide Perovskite Layers through Post-Hot Pressing

Kwang Choi, Min Ju Jeong, Seungmin Lee, Ghaida Alosaimi, Jan Seidel, Jae Sung Yun, Jun Hong Noh

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Mixed-halide perovskites (MHPs) have attracted attention as suitable wide-band-gap candidate materials for tandem applications owing to their facile band-gap tuning. However, when smaller bromide ions are incorporated into iodides to tune the band gap, photoinduced halide segregation occurs, which leads to voltage deficit and photoinstability. Here, we propose an original post-hot pressing (PHP) treatment that suppresses halide segregation in MHPs with a band gap of 2.0 eV. The PHP treatment reconstructs open-structured grain boundaries (GBs) as compact GBs through constrained grain growth in the in-plane direction, resulting in the inhibition of defect-mediated ion migration in GBs. The PHP-treated wide-band-gap (2.0 eV) MHP solar cells showed a high efficiency of over 11%, achieving an open-circuit voltage (V_oc) of 1.35 V and improving the maintenance of the initial efficiency under the working condition at AM 1.5G. The results reveal that the management of GBs is necessary to secure the stability of wide-band-gap MHP devices in terms of halide segregation.

Original language	English
Pages (from-to)	24341-24350
Number of pages	10
Journal	ACS Applied Materials and Interfaces
Volume	14
Issue number	21
DOIs	https://doi.org/10.1021/acsami.2c03492
Publication status	Published - 2022 Jun 1

Keywords

hot pressing
mixed-halide perovskite
photoinduced halide segregation
solar cells
wide-band-gap perovskite

ASJC Scopus subject areas

Materials Science(all)

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10.1021/acsami.2c03492

Cite this

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title = "Suppressing Halide Segregation in Wide-Band-Gap Mixed-Halide Perovskite Layers through Post-Hot Pressing",

abstract = "Mixed-halide perovskites (MHPs) have attracted attention as suitable wide-band-gap candidate materials for tandem applications owing to their facile band-gap tuning. However, when smaller bromide ions are incorporated into iodides to tune the band gap, photoinduced halide segregation occurs, which leads to voltage deficit and photoinstability. Here, we propose an original post-hot pressing (PHP) treatment that suppresses halide segregation in MHPs with a band gap of 2.0 eV. The PHP treatment reconstructs open-structured grain boundaries (GBs) as compact GBs through constrained grain growth in the in-plane direction, resulting in the inhibition of defect-mediated ion migration in GBs. The PHP-treated wide-band-gap (2.0 eV) MHP solar cells showed a high efficiency of over 11%, achieving an open-circuit voltage (Voc) of 1.35 V and improving the maintenance of the initial efficiency under the working condition at AM 1.5G. The results reveal that the management of GBs is necessary to secure the stability of wide-band-gap MHP devices in terms of halide segregation.",

keywords = "hot pressing, mixed-halide perovskite, photoinduced halide segregation, solar cells, wide-band-gap perovskite",

author = "Kwang Choi and Jeong, {Min Ju} and Seungmin Lee and Ghaida Alosaimi and Jan Seidel and Yun, {Jae Sung} and Noh, {Jun Hong}",

note = "Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean Ministry of Science, ICT and Future Planning (NRF-2020R1A2C3009115, NRF-2017M1A2A2087351, and NRF-2017R1A4A1015022). J.S acknowledges support from the Australian Research Council (ARC) through Discovery Grants and the ARC Center of Excellence in Future Low Energy Electronics Technologies. J.S.Y. acknowledges support from the Australian Center for Advanced Photovoltaics. Publisher Copyright: {\textcopyright} 2022 American Chemical Society. All rights reserved.",

year = "2022",

month = jun,

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doi = "10.1021/acsami.2c03492",

language = "English",

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T1 - Suppressing Halide Segregation in Wide-Band-Gap Mixed-Halide Perovskite Layers through Post-Hot Pressing

AU - Choi, Kwang

AU - Jeong, Min Ju

AU - Lee, Seungmin

AU - Alosaimi, Ghaida

AU - Seidel, Jan

AU - Yun, Jae Sung

AU - Noh, Jun Hong

N1 - Funding Information: This work was supported by a National Research Foundation of Korea (NRF) grant funded by the Korean Ministry of Science, ICT and Future Planning (NRF-2020R1A2C3009115, NRF-2017M1A2A2087351, and NRF-2017R1A4A1015022). J.S acknowledges support from the Australian Research Council (ARC) through Discovery Grants and the ARC Center of Excellence in Future Low Energy Electronics Technologies. J.S.Y. acknowledges support from the Australian Center for Advanced Photovoltaics. Publisher Copyright: © 2022 American Chemical Society. All rights reserved.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - Mixed-halide perovskites (MHPs) have attracted attention as suitable wide-band-gap candidate materials for tandem applications owing to their facile band-gap tuning. However, when smaller bromide ions are incorporated into iodides to tune the band gap, photoinduced halide segregation occurs, which leads to voltage deficit and photoinstability. Here, we propose an original post-hot pressing (PHP) treatment that suppresses halide segregation in MHPs with a band gap of 2.0 eV. The PHP treatment reconstructs open-structured grain boundaries (GBs) as compact GBs through constrained grain growth in the in-plane direction, resulting in the inhibition of defect-mediated ion migration in GBs. The PHP-treated wide-band-gap (2.0 eV) MHP solar cells showed a high efficiency of over 11%, achieving an open-circuit voltage (Voc) of 1.35 V and improving the maintenance of the initial efficiency under the working condition at AM 1.5G. The results reveal that the management of GBs is necessary to secure the stability of wide-band-gap MHP devices in terms of halide segregation.

AB - Mixed-halide perovskites (MHPs) have attracted attention as suitable wide-band-gap candidate materials for tandem applications owing to their facile band-gap tuning. However, when smaller bromide ions are incorporated into iodides to tune the band gap, photoinduced halide segregation occurs, which leads to voltage deficit and photoinstability. Here, we propose an original post-hot pressing (PHP) treatment that suppresses halide segregation in MHPs with a band gap of 2.0 eV. The PHP treatment reconstructs open-structured grain boundaries (GBs) as compact GBs through constrained grain growth in the in-plane direction, resulting in the inhibition of defect-mediated ion migration in GBs. The PHP-treated wide-band-gap (2.0 eV) MHP solar cells showed a high efficiency of over 11%, achieving an open-circuit voltage (Voc) of 1.35 V and improving the maintenance of the initial efficiency under the working condition at AM 1.5G. The results reveal that the management of GBs is necessary to secure the stability of wide-band-gap MHP devices in terms of halide segregation.

KW - hot pressing

KW - mixed-halide perovskite

KW - photoinduced halide segregation

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ER -

Suppressing Halide Segregation in Wide-Band-Gap Mixed-Halide Perovskite Layers through Post-Hot Pressing

Abstract

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