Journal
NANO RESEARCH
Volume 11, Issue 12, Pages 6283-6293Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-018-2151-4
Keywords
solar cells; perovskite; band-gap engineering; bismuth halide; lead free
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Funding
- Fundamental Research Program of the Korea Institute of Materials Science (KIMS) [PNK 5840]
- Creative Materials Discovery Program through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [NRF-2018M3D1A1056688]
- Basic Research Laboratory through the National Research Foundation of Korea [NRF - 2017R1A4A1015323]
- National Research Foundation of Korea [22A20130000037, 2017R1A4A1015323, 2017M3D1A1039288] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Despite the excellent merits of lead perovskite solar cells, their instability and toxicity still present a bottleneck for practical applications. Bismuth perovskite has emerged as a candidate for photovoltaic (PV) applications, because it not only has a low toxicity but is also stable in air. However, the power conversion efficiency (PCE) remains an unsolved problem. We performed band gap tuning experiments to improve the efficiency. The absorption of ABi(3)I(10) structure films was extended within the visible region, and the optical band gap was decreased considerably compared to that for Cs3Bi2I9. Furthermore, we explained the correlation between the structure and the optical properties via a first-principles study. A device employing CsBi3I10 as a photoactive layer exhibits a PCE of 1.51% and an excellent ambient stability over 30 days.
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