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Title: Shallow halogen vacancies in halide optoelectronic materials

Journal Article · · Physical Review. B, Condensed Matter and Materials Physics
 [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division

Halogen vacancies (VH) are usually deep color centers (F centers) in halides and can act as major electron traps or recombination centers. The deep VH contributes to the typically poor carrier transport properties in halides. However, several halides have recently emerged as excellent optoelectronic materials, e.g., CH3NH3PbI3 and TlBr. Both CH3NH3PbI3 and TlBr have been found to have shallow VH, in contrast to commonly seen deep VH in halides. In this paper, several halide optoelectronic materials, i.e., CH3NH3PbI3, CH3NH3SnI3 (photovoltaic materials), TlBr, and CsPbBr3, (gamma-ray detection materials) are studied to understand the material chemistry and structure that determine whether VH is a shallow or deep defect in a halide material. It is found that crystal structure and chemistry of ns2 ions both play important roles in creating shallow VH in halides such as CH3NH3PbI3, CH3NH3SnI3, and TlBr. The key to identifying halides with shallow VH is to find the right crystal structures and compounds that suppress cation orbital hybridization at VH, such as those with long cation-cation distances and low anion coordination numbers, and those with crystal symmetry that prevents strong hybridization of cation dangling bond orbitals at VH. Furthermore, the results of this paper provide insight and guidance to identifying halides with shallow VH as good electronic and optoelectronic materials.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Department of Homeland Security (DHS)
Grant/Contract Number:
AC05-00OR22725; HSHQDC-14-R-B0009
OSTI ID:
1185671
Alternate ID(s):
OSTI ID: 1180339
Journal Information:
Physical Review. B, Condensed Matter and Materials Physics, Vol. 90, Issue 17; ISSN 1098-0121
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 111 works
Citation information provided by
Web of Science

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Cited By (22)

High-Temperature Photoluminescence of CsPbX 3 (X = Cl, Br, I) Nanocrystals journal March 2017
Resistive Switching Behavior in Organic-Inorganic Hybrid CH 3 NH 3 PbI 3 −x Cl x Perovskite for Resistive Random Access Memory Devices journal August 2015
Halide Perovskites: Poor Man's High-Performance Semiconductors journal May 2016
Ion-Migration Inhibition by the Cation-π Interaction in Perovskite Materials for Efficient and Stable Perovskite Solar Cells journal June 2018
From Lead Halide Perovskites to Lead‐Free Metal Halide Perovskites and Perovskite Derivatives journal January 2019
Atomic Structure and Electrical Activity of Grain Boundaries and Ruddlesden-Popper Faults in Cesium Lead Bromide Perovskite journal December 2018
Impact of White Light Illumination on the Electronic and Chemical Structures of Mixed Halide and Single Crystal Perovskites journal March 2017
Photoinduced Trap Passivation for Enhanced Photoluminescence in 2D Organic–Inorganic Hybrid Perovskites journal February 2020
Formation and Diffusion of Metal Impurities in Perovskite Solar Cell Material CH 3 NH 3 PbI 3 : Implications on Solar Cell Degradation and Choice of Electrode journal December 2017
Progress in Theoretical Study of Metal Halide Perovskite Solar Cell Materials journal August 2017
Enhanced Stability and Tunable Photoluminescence in Perovskite CsPbX 3 /ZnS Quantum Dot Heterostructure journal April 2017
Ultrastable CsPbBr 3 Perovskite Quantum Dot and Their Enhanced Amplified Spontaneous Emission by Surface Ligand Modification journal April 2019
Heterogeneity at multiple length scales in halide perovskite semiconductors journal July 2019
Switching excitonic recombination and carrier trapping in cesium lead halide perovskites by air journal December 2018
Performance improvement of perovskite solar cells by employing a CdSe quantum dot/PCBM composite as an electron transport layer journal January 2017
Correlation of near-unity quantum yields with photogenerated excitons in X-type ligand passivated CsPbBr 3 perovskite quantum dots journal January 2019
Spacer layer design for efficient fully printable mesoscopic perovskite solar cells journal January 2019
Research Update: Luminescence in lead halide perovskites journal September 2016
In situ investigation of light soaking in organolead halide perovskite films journal April 2019
Ionic transport characteristics of large-size CsPbBr 3 single crystals journal September 2019
Heterogeneity at multiple length scales in halide perovskite semiconductors text January 2019
In situ investigation of light soaking in organolead halide perovskite films text January 2019

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