DataVXACS Materials LettersPaper
journal article·2020-07-06Open access

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

ACS Materials Letters· Volume 2· Issue 7
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Source abstract

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.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Thermal Expansion and Ionic Conductivity

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto Ontario M5S 1A4, Canada

Department of Chemistry, University of Toronto, 80 St. George Street, Toronto Ontario, M5S 3G4, Canada

Department of Materials Science and Engineering, University of Toronto, 184 College Street, Toronto Ontario M5S 3E4, Canada

Department of Chemistry and Electrical and Computer Engineering, Centre for Advanced Materials and Related Technologies (CAMTEC), University of Victoria, Victoria V8P 5C2, Canada

Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto Ontario M5S 3M2, Canada

Funding

Office of Naval Research · Ontario Research Fund-Research Excellence program

References (18)

Show source-provided references
1. 10.1038/nphoton.2014.13410.1038/nphoton.2014.134 ↗
2. 10.1038/s41560-018-0190-410.1038/s41560-018-0190-4 ↗
3. 10.1021/acsenergylett.8b0057610.1021/acsenergylett.8b00576 ↗
4. 10.1038/s41560-019-0466-310.1038/s41560-019-0466-3 ↗
5. 10.1002/aenm.20180369910.1002/aenm.201803699 ↗
6. 10.1021/acsenergylett.7b0125510.1021/acsenergylett.7b01255 ↗
7. 10.1039/C5TA06398A10.1039/C5TA06398A ↗
8. 10.1002/aenm.20170154310.1002/aenm.201701543 ↗
9. 10.1038/s41467-018-07204-y10.1038/s41467-018-07204-y ↗
10. 10.1021/acs.chemmater.5b0410710.1021/acs.chemmater.5b04107 ↗
11. 10.1021/jacs.8b0605010.1021/jacs.8b06050 ↗
12. 10.1021/jacs.8b0594910.1021/jacs.8b05949 ↗
13. 10.1016/j.joule.2017.08.00510.1016/j.joule.2017.08.005 ↗
14. 10.1126/science.aav868010.1126/science.aav8680 ↗
15. 10.1038/s41467-018-04636-410.1038/s41467-018-04636-4 ↗
16. 10.1002/adma.20170627510.1002/adma.201706275 ↗
17. 10.1039/C4SC03141E10.1039/C4SC03141E ↗
18. 10.1038/s41467-018-05531-810.1038/s41467-018-05531-8 ↗