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Wu, Hua
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Wu, H., Zhu, H., Erbing, A., Johansson, M. B., Mukherjee, S., Man, G., . . . Johansson, E. (2019). Bandgap Tuning of Silver Bismuth Iodide via Controllable Bromide Substitution for Improved Photovoltaic Performance. ACS APPLIED ENERGY MATERIALS
Open this publication in new window or tab >>Bandgap Tuning of Silver Bismuth Iodide via Controllable Bromide Substitution for Improved Photovoltaic Performance
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2019 (English)In: ACS APPLIED ENERGY MATERIALSArticle in journal (Refereed) Accepted
Abstract [en]

In this work, silver-bismuth-halide thin films, exhibiting low toxicity and good stability, were explored systemically by gradually substituting iodide, I, with bromide, Br, in the AgBi2I7 system. It was found that the optical bandgap can be tuned by varying the I/Br ratio. Moreover, the film quality was improved when introducing a small amount of Br. The solar cell was demonstrated to be more stable at ambient conditions and most efficient when incorporating 10% Br, as a result of decreased recombination originating from the increased grain size. Thus, replacing a small amount of I with Br was beneficial for photovoltaic performance.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
Keywords
lead-free solar cells, power conversion efficiency, bandgap, silver bismuth iodide, mixed-halide composition, grain size, density functional theory
National Category
Physical Chemistry Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-391056 (URN)10.1021/acsaem.9b00914 (DOI)000483434700003 ()
Funder
Swedish Research CouncilSwedish Energy Agency
Available from: 2019-08-18 Created: 2019-08-18 Last updated: 2019-10-09Bibliographically approved
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