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Mixed-halide Pb-Sn binary perovskite films with various Sn-content for Pb-reduced solar cells
- Authors
- Lee, Seojun; Ha, Tae-Jun; Kang, Dong-Won
- Issue Date
- Sep-2018
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- Solar energy materials; Thin films; Perovskite; Lead; Tin
- Citation
- MATERIALS LETTERS, v.227, pp 311 - 314
- Pages
- 4
- Journal Title
- MATERIALS LETTERS
- Volume
- 227
- Start Page
- 311
- End Page
- 314
- ISSN
- 0167-577X
1873-4979
- Abstract
- We proposed and examined a material group of methylammonium Pb-Sn mixed halide (MAPb(1-x)Sn(x)I(2.6)Br(0.4)) with various Sn-content (x = 0.2-0.8) for Pb-reduced perovskite solar cells. With suitable Pb-Sn ratio (x = 0.4-0.6), dense coverage of films with better crystallinity was obtained compared with low Sn ratio (x = 0.2). For excess Sn ratio (x = 0.8), poor film-uniformity was found in spite of its enhanced crystallinity. Optimum composition (x = 0.6) provided an impressive power conversion efficiency of 13.4% with remarkable photocurrent output stability, which is related to suppression of trap-assisted recombination regarding the perovskite materials. This promising material paves the way for development of highly efficient, Pb-reduced perovskite photovoltaic cells. (C) 2018 Elsevier B.V. All rights reserved.
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