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Title: Phase Stability and Diffusion in Lateral Heterostructures of Methyl Ammonium Lead Halide Perovskites

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [1];  [2];  [3]; ORCiD logo [4]; ORCiD logo [5];  [1]; ORCiD logo [1]
  1. Univ. of California, Santa Barbara, CA (United States). Dept. of Materials
  2. Mitsubishi Chemical Corporation (Japan). Electronics Materials and New Energy Lab.; Univ. of California, Santa Barbara, CA (United States). Dept. of Materials
  3. Mitsubishi Chemical Corporation (Japan). Electronics Materials and New Energy Lab.
  4. Univ. of California, Santa Barbara, CA (United States). Dept. of Electrical and Computer Engineering
  5. Univ. of California, Santa Barbara, CA (United States). Dept. of Materials; Univ. of California, Santa Barbara, CA (United States). Dept. of Chemistry and Biochemistry

Mixed-halide hybrid organic inorganic perovskites have band gaps that span the visible spectrum making them candidates for optoelectronic devices. Diffusion of the halide atoms in methyl ammonium lead iodide (MAPbI3) and its alloys with bromine has been observed in both dark and under illumination. While halide transport upon application of electric fields has received much attention, less is known regarding bromide and iodide interdiffusion down concentration gradients. This work provides an upper bound on the bromide-iodide interdiffusion coefficient $$D_i$$, in thin films of (MAPbBrxI1-x)3 using a diffusion couple of a lateral heterostructure. The upper bound of $$D_i$$ was extracted from changes in the interface profiles of the heterostructures upon exposure to heat. The stability of thoroughly-heated interfacial profiles suggests that the miscibility gap extends to higher temperatures and to a higher fractional composition of bromine than predicted by theory. The results of this work provide guidance for compositions of thermally stable heterostructures of hybrid halide perovskites.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Quantum Materials for Energy Efficient Neuromorphic Computing (Q-MEEN-C); Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012541; DMR-1720256; SC0019273; DBI-1625770
OSTI ID:
1594805
Journal Information:
ACS Applied Materials and Interfaces, Vol. 11, Issue 28; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (2)

Enhanced yield-mobility products in hybrid halide Ruddlesden–Popper compounds with aromatic ammonium spacers journal January 2019
Temperature-driven anion migration in gradient halide perovskites journal October 2019

Figures / Tables (9)