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Title: Real-Time Observation of Order-Disorder Transformation of Organic Cations Induced Phase Transition and Anomalous Photoluminescence in Hybrid Perovskites

Journal Article · · Advanced Materials
 [1];  [2];  [2];  [3];  [4];  [4];  [5];  [4];  [6];  [4]
  1. Hunan Univ., Changsha (China). College of Materials Science and Engineering, Key Lab. for Micro-Nano Physics and Technology of Hunan Province; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  5. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Mechanical and Materials Engineering
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division

A fundamental understanding of the interplay between the microscopic structure and macroscopic optoelectronic properties of organic-inorganic hybrid perovskite materials is essential to design new materials and improve device performance. However, how exactly the organic cations affect the structural phase transition and optoelectronic properties of the materials is not well understood. Here, real-time, in situ temperature-dependent neutron/X-ray diffraction and photoluminescence (PL) measurements reveal a transformation of the organic cation CH3NH3 + from order to disorder with increasing temperature in CH3NH3PbBr3 perovskites. The molecular-level order-to-disorder transformation of CH3NH3 + not only leads to an anomalous increase in PL intensity, but also results in a multidomain to single-domain structural transition. Lastly, this discovery establishes the important role that organic cation ordering has in dictating structural order and anomalous optoelectronic phenomenon in hybrid perovskites.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1458381
Journal Information:
Advanced Materials, Journal Name: Advanced Materials Journal Issue: 22 Vol. 30; ISSN 0935-9648
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Electron‐Beam‐Related Studies of Halide Perovskites: Challenges and Opportunities journal February 2020
Dynamic Disorder Restriction of Methylammonium (MA) Groups in Chloride‐Doped MAPbBr 3 Hybrid Perovskites: A Neutron Powder Diffraction Study journal March 2019
Dual phosphorescence from the organic and inorganic moieties of 1D hybrid perovskites of the Pb n′ Br 4n′+2 series ( n ′ = 2, 3, 4, 5) journal January 2019
Low-temperature synthesis of all-inorganic perovskite nanocrystals for UV-photodetectors journal January 2019
Temperature-dependent optical properties of hybrid organic–inorganic perovskite single crystals (CH 3 NH 3 PbI 3 and CH 3 NH 3 PbBr 3 ) journal June 2019