Linking phase segregation and photovoltaic performance of mixed-halide perovskite films through grain size engineering

Long Hu; Xinwei Guan; Weijian Chen; Yuchen Yao; Tao Wan; Chun-Ho Lin; Ngoc Duy Pham; Lin Yuan; Xun Geng; Fei Wang; Chieng-Yu Huang; Jianyu Yuan; Soshan Cheong; Richard D. Tilley; Xiaoming Wen; Dewei Chu; Shujuan Huang; Tom Wu

doi:10.1021/acsenergylett.1c00213

Linking phase segregation and photovoltaic performance of mixed-halide perovskite films through grain size engineering

Long Hu, Xinwei Guan, Weijian Chen, Yuchen Yao, Tao Wan, Chun-Ho Lin, Ngoc Duy Pham, Lin Yuan, Xun Geng, Fei Wang, Chieng-Yu Huang, Jianyu Yuan, Soshan Cheong, Richard D. Tilley, Xiaoming Wen, Dewei Chu^*, Shujuan Huang^*, Tom Wu^*

^*Corresponding author for this work

School of Engineering

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

1 Citation (Scopus)

Abstract

Mixed-halide perovskites are attractive candidates as wide-bandgap absorber layers in tandem solar cells. However, photoinduced phase segregation leads to the formation of Br-rich and I-rich domains with uncontrolled composition and bandgap, which is considered as the main obstacle for achieving stable solar cells. Herein, we tune the grain size of CsPbBr_1.5I_1.5 films derived from nanocrystals and investigate the corresponding charge transport properties. The correlation between phase segregation, grain size, and the corresponding solar cell performance is unravelled. Specifically, phase segregation takes place in CsPbBr_1.5I_1.5 films with an average crystal size being equal to or larger than 43 nm, which consequently leads to significantly degraded performance in the solar cells with such large grains under continuous light soaking. These findings provide the highly sought-after guidelines for achieving phase-segregation-free mixed-halide perovskite films for stable optoelectronic applications.
[Graphic abstract presents]

Original language	English
Pages (from-to)	1649-1658
Number of pages	10
Journal	ACS Energy Letters
Volume	6
Issue number	4
DOIs	https://doi.org/10.1021/acsenergylett.1c00213
Publication status	Published - 9 Apr 2021

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Hu, L., Guan, X., Chen, W., Yao, Y., Wan, T., Lin, C-H., Pham, N. D., Yuan, L., Geng, X., Wang, F., Huang, C-Y., Yuan, J., Cheong, S., Tilley, R. D., Wen, X., Chu, D., Huang, S., & Wu, T. (2021). Linking phase segregation and photovoltaic performance of mixed-halide perovskite films through grain size engineering. ACS Energy Letters, 6(4), 1649-1658. https://doi.org/10.1021/acsenergylett.1c00213

Hu, Long ; Guan, Xinwei ; Chen, Weijian ; Yao, Yuchen ; Wan, Tao ; Lin, Chun-Ho ; Pham, Ngoc Duy ; Yuan, Lin ; Geng, Xun ; Wang, Fei ; Huang, Chieng-Yu ; Yuan, Jianyu ; Cheong, Soshan ; Tilley, Richard D. ; Wen, Xiaoming ; Chu, Dewei ; Huang, Shujuan ; Wu, Tom. / Linking phase segregation and photovoltaic performance of mixed-halide perovskite films through grain size engineering. In: ACS Energy Letters. 2021 ; Vol. 6, No. 4. pp. 1649-1658.

@article{027e18a2c4cc4fd4b0cec248e8b38a00,

title = "Linking phase segregation and photovoltaic performance of mixed-halide perovskite films through grain size engineering",

abstract = "Mixed-halide perovskites are attractive candidates as wide-bandgap absorber layers in tandem solar cells. However, photoinduced phase segregation leads to the formation of Br-rich and I-rich domains with uncontrolled composition and bandgap, which is considered as the main obstacle for achieving stable solar cells. Herein, we tune the grain size of CsPbBr1.5I1.5 films derived from nanocrystals and investigate the corresponding charge transport properties. The correlation between phase segregation, grain size, and the corresponding solar cell performance is unravelled. Specifically, phase segregation takes place in CsPbBr1.5I1.5 films with an average crystal size being equal to or larger than 43 nm, which consequently leads to significantly degraded performance in the solar cells with such large grains under continuous light soaking. These findings provide the highly sought-after guidelines for achieving phase-segregation-free mixed-halide perovskite films for stable optoelectronic applications.[Graphic abstract presents]",

author = "Long Hu and Xinwei Guan and Weijian Chen and Yuchen Yao and Tao Wan and Chun-Ho Lin and Pham, {Ngoc Duy} and Lin Yuan and Xun Geng and Fei Wang and Chieng-Yu Huang and Jianyu Yuan and Soshan Cheong and Tilley, {Richard D.} and Xiaoming Wen and Dewei Chu and Shujuan Huang and Tom Wu",

year = "2021",

month = apr,

day = "9",

doi = "10.1021/acsenergylett.1c00213",

language = "English",

volume = "6",

pages = "1649--1658",

journal = "ACS Energy Letters",

issn = "2380-8195",

publisher = "American Chemical Society",

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Hu, L, Guan, X, Chen, W, Yao, Y, Wan, T, Lin, C-H, Pham, ND, Yuan, L, Geng, X, Wang, F, Huang, C-Y, Yuan, J, Cheong, S, Tilley, RD, Wen, X, Chu, D, Huang, S & Wu, T 2021, 'Linking phase segregation and photovoltaic performance of mixed-halide perovskite films through grain size engineering', ACS Energy Letters, vol. 6, no. 4, pp. 1649-1658. https://doi.org/10.1021/acsenergylett.1c00213

Linking phase segregation and photovoltaic performance of mixed-halide perovskite films through grain size engineering. / Hu, Long; Guan, Xinwei; Chen, Weijian; Yao, Yuchen; Wan, Tao; Lin, Chun-Ho; Pham, Ngoc Duy; Yuan, Lin; Geng, Xun; Wang, Fei; Huang, Chieng-Yu; Yuan, Jianyu; Cheong, Soshan; Tilley, Richard D.; Wen, Xiaoming; Chu, Dewei; Huang, Shujuan; Wu, Tom.

In: ACS Energy Letters, Vol. 6, No. 4, 09.04.2021, p. 1649-1658.

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

TY - JOUR

T1 - Linking phase segregation and photovoltaic performance of mixed-halide perovskite films through grain size engineering

AU - Hu, Long

AU - Guan, Xinwei

AU - Chen, Weijian

AU - Yao, Yuchen

AU - Wan, Tao

AU - Lin, Chun-Ho

AU - Pham, Ngoc Duy

AU - Yuan, Lin

AU - Geng, Xun

AU - Wang, Fei

AU - Huang, Chieng-Yu

AU - Yuan, Jianyu

AU - Cheong, Soshan

AU - Tilley, Richard D.

AU - Wen, Xiaoming

AU - Chu, Dewei

AU - Huang, Shujuan

AU - Wu, Tom

PY - 2021/4/9

Y1 - 2021/4/9

N2 - Mixed-halide perovskites are attractive candidates as wide-bandgap absorber layers in tandem solar cells. However, photoinduced phase segregation leads to the formation of Br-rich and I-rich domains with uncontrolled composition and bandgap, which is considered as the main obstacle for achieving stable solar cells. Herein, we tune the grain size of CsPbBr1.5I1.5 films derived from nanocrystals and investigate the corresponding charge transport properties. The correlation between phase segregation, grain size, and the corresponding solar cell performance is unravelled. Specifically, phase segregation takes place in CsPbBr1.5I1.5 films with an average crystal size being equal to or larger than 43 nm, which consequently leads to significantly degraded performance in the solar cells with such large grains under continuous light soaking. These findings provide the highly sought-after guidelines for achieving phase-segregation-free mixed-halide perovskite films for stable optoelectronic applications.[Graphic abstract presents]

AB - Mixed-halide perovskites are attractive candidates as wide-bandgap absorber layers in tandem solar cells. However, photoinduced phase segregation leads to the formation of Br-rich and I-rich domains with uncontrolled composition and bandgap, which is considered as the main obstacle for achieving stable solar cells. Herein, we tune the grain size of CsPbBr1.5I1.5 films derived from nanocrystals and investigate the corresponding charge transport properties. The correlation between phase segregation, grain size, and the corresponding solar cell performance is unravelled. Specifically, phase segregation takes place in CsPbBr1.5I1.5 films with an average crystal size being equal to or larger than 43 nm, which consequently leads to significantly degraded performance in the solar cells with such large grains under continuous light soaking. These findings provide the highly sought-after guidelines for achieving phase-segregation-free mixed-halide perovskite films for stable optoelectronic applications.[Graphic abstract presents]

UR - http://purl.org/au-research/grants/arc/DP190103316

UR - http://www.scopus.com/inward/record.url?scp=85104912325&partnerID=8YFLogxK

U2 - 10.1021/acsenergylett.1c00213

DO - 10.1021/acsenergylett.1c00213

M3 - Article

VL - 6

SP - 1649

EP - 1658

JO - ACS Energy Letters

JF - ACS Energy Letters

SN - 2380-8195

IS - 4

ER -

Linking phase segregation and photovoltaic performance of mixed-halide perovskite films through grain size engineering

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