4.8 Article

Solution-Processed Bismuth Halide Perovskite Thin Films: Influence of Deposition Conditions and A-Site Alloying on Morphology and Optical Properties

Journal

JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 10, Issue 11, Pages 3134-3139

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.9b00969

Keywords

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Funding

  1. Air Force Office of Scientific Research Young Investigator Program [FA9550-17-1-0170]
  2. DOE [DE-AC52-07NA27344]
  3. Herbert L. Stiles Faculty Fellowship
  4. National Science Foundation Graduate Research Fellowship Program [DGE 1744592]

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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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