Formation of Stable Metal Halide Perovskite/Perovskite Heterojunctions

Catherine P. Clark, Jennifer E. Mann, John S. Bangsund, Wan Ju Hsu, Eray S. Aydil, Russell J. Holmes

Research output: Contribution to journalArticlepeer-review


Heterojunctions underpin the design and performance of virtually all devices based on conventional semiconductors. While metal halide perovskites have received intense attention for applications in photoconversion and optoelectronics, these devices are often hybrid, containing interfaces between the perovskite and metal oxide or organic semiconductor layers. Heterojunctions between two perovskite layers could enable new paradigms in device engineering, but to date, their formation has remained limited due to difficulty in fabricating multilayers and facile ion diffusion across interfaces. Here, sequential solution and vapor processing is used to successfully fabricate perovskite/perovskite heterojunctions comprising three-dimensional APbX3/CH3NH3SnX3 [A = CH(NH2)2, CH3NH3, or Cs; X = I or Br] layers. Heterojunction stability is investigated leading to the identification of two pairings that are stable for >1500 h at room temperature. By probing mixing as a function of composition and grain size, we propose general design rules for the realization of stable perovskite/perovskite heterojunctions.

Original languageEnglish (US)
Pages (from-to)3443-3451
Number of pages9
JournalACS Energy Letters
Issue number11
StatePublished - Nov 13 2020

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry


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