期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 10, 期 11, 页码 3134-3139出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b00969
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资金
- Air Force Office of Scientific Research Young Investigator Program [FA9550-17-1-0170]
- DOE [DE-AC52-07NA27344]
- Herbert L. Stiles Faculty Fellowship
- National Science Foundation Graduate Research Fellowship Program [DGE 1744592]
Bismuth-based halide perovskites have been proposed as a potential nontoxic alternative to lead halide perovskites; however, they have not realized suitable performance. Their poor performance has been attributed to substandard film morphologies and too wide of a band gap for many applications. Herein we used a two-step deposition procedure to convert BiI3 thin films into A(3)Bi(2)I(9) (A = FA(+), MAP, Cs+, or Rb+), which resulted in a substantial improvement in film morphology, a larger band gap, and greater compositional tunability compared toresults when using aconventional single-step deposition technique. Additionally, we attempted to reduce the undesirably wide band gap in Rb3Bi2I9 thin films by inducing chemical pressures through cation-size mismatch, with an underlying hypothesis that cation-size mismatch could induce compressive strain within the 2D Rb3Bi2I9 lattice. However, we found that all A(x)Rb(3-x)Bi(2)I(9) compositions with x > 0 adopted the 0D structure, and no changes to the band gap were observed with alloy. These results imply that the band gap of A(x)Rb(3-x)Bi(2)I(9) is insensitive to A-site alloying.
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