Stable, Bromine-Free, Tetragonal Perovskites with 1.7 eV Bandgaps via A-Site Cation Substitution

Ziru Huang; Bin Chen; Laxmi Kishore Sagar; Yi Hou; Andrew Proppe; Hao Ting Kung; Fanglong Yuan; Andrew Johnston; Makhsud I. Saidaminov; Eui Hyuk Jung; Zheng Hong Lu; Shana O. Kelley; Edward H. Sargent

doi:10.1021/acsmaterialslett.0c00166

Stable, Bromine-Free, Tetragonal Perovskites with 1.7 eV Bandgaps via A-Site Cation Substitution

Ziru Huang, Bin Chen, Laxmi Kishore Sagar, Yi Hou, Andrew Proppe, Hao Ting Kung, Fanglong Yuan, Andrew Johnston, Makhsud I. Saidaminov, Eui Hyuk Jung, Zheng Hong Lu, Shana O. Kelley, Edward H. Sargent^*

^*Corresponding author for this work

Chemistry

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

20 Scopus citations

Abstract

Metal halide perovskite absorbers with wide bandgaps (1.6-1.7 eV) that are suitable for tandem devices typically require high Br concentrations; this renders the material prone to halide segregation and degradation. Inorganic, bromine-free CsPbI3 has a wide bandgap of 1.7 eV and does not suffer from halide segregation; however, these active layers are not stable at room temperature. Here, we report a method to create stable tetragonal perovskites with a bandgap near 1.7 eV: we add small amounts of large A-site cations having ionic radii between 272 and 278 pm - dimethylammonium (DMA) and guanidinium (Gua) - into the crystal lattice. When we deploy perovskites using mixed Cs and these large organic cations, we achieve stable, wide bandgap perovskites with power conversion efficiencies of 15.2% and VOC of 1.19 V. This study extends materials selection for wide bandgap Cs-based perovskites.

Original language	English (US)
Pages (from-to)	869-872
Number of pages	4
Journal	ACS Materials Letters
Volume	2
Issue number	7
DOIs	https://doi.org/10.1021/acsmaterialslett.0c00166
State	Published - Jul 6 2020

Funding

This work was supported by Ontario Research Fund-Research Excellence program (ORF7-Ministry of Research and Innovation, Ontario Research Fund-Research Excellence Round 7) and US Department of the Navy, Office of Naval Research (Grant Award No. N00014-17-1-2524).

ASJC Scopus subject areas

General Chemical Engineering
Biomedical Engineering
General Materials Science

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title = "Stable, Bromine-Free, Tetragonal Perovskites with 1.7 eV Bandgaps via A-Site Cation Substitution",

abstract = "Metal halide perovskite absorbers with wide bandgaps (1.6-1.7 eV) that are suitable for tandem devices typically require high Br concentrations; this renders the material prone to halide segregation and degradation. Inorganic, bromine-free CsPbI3 has a wide bandgap of 1.7 eV and does not suffer from halide segregation; however, these active layers are not stable at room temperature. Here, we report a method to create stable tetragonal perovskites with a bandgap near 1.7 eV: we add small amounts of large A-site cations having ionic radii between 272 and 278 pm - dimethylammonium (DMA) and guanidinium (Gua) - into the crystal lattice. When we deploy perovskites using mixed Cs and these large organic cations, we achieve stable, wide bandgap perovskites with power conversion efficiencies of 15.2% and VOC of 1.19 V. This study extends materials selection for wide bandgap Cs-based perovskites.",

author = "Ziru Huang and Bin Chen and Sagar, {Laxmi Kishore} and Yi Hou and Andrew Proppe and Kung, {Hao Ting} and Fanglong Yuan and Andrew Johnston and Saidaminov, {Makhsud I.} and Jung, {Eui Hyuk} and Lu, {Zheng Hong} and Kelley, {Shana O.} and Sargent, {Edward H.}",

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doi = "10.1021/acsmaterialslett.0c00166",

language = "English (US)",

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AU - Huang, Ziru

AU - Chen, Bin

AU - Sagar, Laxmi Kishore

AU - Hou, Yi

AU - Proppe, Andrew

AU - Kung, Hao Ting

AU - Yuan, Fanglong

AU - Johnston, Andrew

AU - Saidaminov, Makhsud I.

AU - Jung, Eui Hyuk

AU - Lu, Zheng Hong

AU - Kelley, Shana O.

AU - Sargent, Edward H.

PY - 2020/7/6

Y1 - 2020/7/6

N2 - Metal halide perovskite absorbers with wide bandgaps (1.6-1.7 eV) that are suitable for tandem devices typically require high Br concentrations; this renders the material prone to halide segregation and degradation. Inorganic, bromine-free CsPbI3 has a wide bandgap of 1.7 eV and does not suffer from halide segregation; however, these active layers are not stable at room temperature. Here, we report a method to create stable tetragonal perovskites with a bandgap near 1.7 eV: we add small amounts of large A-site cations having ionic radii between 272 and 278 pm - dimethylammonium (DMA) and guanidinium (Gua) - into the crystal lattice. When we deploy perovskites using mixed Cs and these large organic cations, we achieve stable, wide bandgap perovskites with power conversion efficiencies of 15.2% and VOC of 1.19 V. This study extends materials selection for wide bandgap Cs-based perovskites.

AB - Metal halide perovskite absorbers with wide bandgaps (1.6-1.7 eV) that are suitable for tandem devices typically require high Br concentrations; this renders the material prone to halide segregation and degradation. Inorganic, bromine-free CsPbI3 has a wide bandgap of 1.7 eV and does not suffer from halide segregation; however, these active layers are not stable at room temperature. Here, we report a method to create stable tetragonal perovskites with a bandgap near 1.7 eV: we add small amounts of large A-site cations having ionic radii between 272 and 278 pm - dimethylammonium (DMA) and guanidinium (Gua) - into the crystal lattice. When we deploy perovskites using mixed Cs and these large organic cations, we achieve stable, wide bandgap perovskites with power conversion efficiencies of 15.2% and VOC of 1.19 V. This study extends materials selection for wide bandgap Cs-based perovskites.

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Stable, Bromine-Free, Tetragonal Perovskites with 1.7 eV Bandgaps via A-Site Cation Substitution

Abstract

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