Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 28, Pages 25313-25321Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b06069
Keywords
halide perovskite; mixed halide; diffusion; phase diagram; heterostructure; halide substitution; diffusion couple
Funding
- Department of Energy Basic Energy Science [DE-SC-0012541]
- National Defense Science and Engineering Graduate fellowship
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0019273]
- NSF MRI grant [DBI-1625770]
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Mixed halide hybrid organic-inorganic perovskites have band gaps that span the visible spectrum making them candidates for optoelectronic devices. Transport of the halide atoms in methyl ammonium lead iodide (MAPbI(3)) 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 MAPb(BrxI1-x)(3) using a diffusion couples of lateral heterostructures. 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.
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