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Title: Density Functional Studies of Stoichiometric Surfaces of Orthorhombic Hybrid Perovskite CH3NH3PbI3

Journal Article · · Journal of Physical Chemistry. C
DOI:https://doi.org/10.1021/jp511123s· OSTI ID:1185779
 [1];  [2];  [2];  [1];  [1];  [1];  [1]
  1. Griffith Univ., Nathan, Queensland (Australia)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Organic/inorganic hybrid perovskite materials are highly attractive for dye-sensitized solar cells as demonstrated by their rapid advances in energy conversion efficiency. In this work, the structures, energetics, and electronic properties for a range of stoichiometric surfaces of the orthorhombic perovskite CH3NH3PbI3 are theoretically studied using density functional theory. Various possible spatially and constitutionally isomeric surfaces are considered by diversifying the spatial orientations and connectivities of surface Pb-I bonds. The comparison of the surface energies for the most stable configurations identified for various surfaces shows that the stabilities of stoichiometric surfaces are mainly dictated by the coordination numbers of surface atoms, which are directly correlated with the numbers of broken bonds. Additionally, Coulombic interactions between I anions and organic countercations on the surface also contribute to the stabilization. Electronic properties are compared between the most stable (100) surface and the bulk phase, showing generally similar features except for the lifted band degeneracy and the enhanced bandgap energy for the surface. These studies on the stoichiometric surfaces serve as the first step toward gaining a fundamental understanding of the interfacial properties in the current structural design of perovskite based solar cells, in order to achieve further breakthroughs in solar conversion efficiencies.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1185779
Journal Information:
Journal of Physical Chemistry. C, Vol. 119, Issue 2; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 63 works
Citation information provided by
Web of Science

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Computational screening of methylammonium based halide perovskites with bandgaps suitable for perovskite-perovskite tandem solar cells journal December 2018
Atomic structure and electronic properties of lead and tin based hybrid halide perovskite surface for photovoltaic applications journal August 2019
Understanding interactions between halide perovskite surfaces and atmospheric/VOC gas molecules: an ab initio investigation journal July 2018
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