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Title: Stability of organometal perovskites with organic overlayers

The air-stability of vapour-phase-deposited methylammonium lead triiodide (CH{sub 3}NH{sub 3}PbI{sub 3}) perovskite thin films has been studied using X-ray diffraction. It is found that the perovskite structure without organic coating decomposes completely within a short period of time (∼two days) upon exposure to ambient environment. The degradation of the perovskite structure is drastically reduced when the perovskite films are capped with thin N,N′-Di(1-naphthyl)-N,N′-diphenyl-(1,1′-biphenyl)-4,4′-diamine (NPB) films. We discovered that the amount of lead iodide (PbI{sub 2}), a product of the degradation, grows as a function of time in a sigmoidal manner. Further mathematical modeling analysis shows that the perovskite degradation follows the Avrami equation, a kinetics theory developed for quantifying phase transformations in solid-state materials.
Authors:
; ; ; ;  [1]
  1. Department of Materials Science and Engineering, University of Toronto, Toronto, Canada M5S 3E4 (Canada)
Publication Date:
OSTI Identifier:
22492335
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 8; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMMONIUM COMPOUNDS; BIPHENYL; CUBIC LATTICES; LAYERS; LEAD IODIDES; METHYL IODIDE; PEROVSKITE; PHASE STABILITY; PHASE TRANSFORMATIONS; SOLIDS; THIN FILMS; TIME DEPENDENCE; VAPORS; X-RAY DIFFRACTION