Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 706, Issue -, Pages 274-279Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2017.02.256
Keywords
Perovskites; CH3NH3PbI3; Photoluminescence; Phase transition
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Funding
- National Natural Science Foundation of China [11604302, 61176044, 11504331]
- China Postdoctoral Science Foundation [2015M582193]
- Science and Technology Research Project of Henan Province [162300410229]
- Postdoctoral Research Sponsorship in Henan Province [2015008]
- Outstanding Young Talent Research Fund of Zhengzhou University [1521317001]
- Startup Research Fund of Zhengzhou University [1512317003]
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Organic-inorganic halide perovskite CH3NH3PbI3 films were synthesized by low-temperature solution method by using a two-step spin-coating technique. We detailedly investigated the effect of the concentration of CH3NH3I solution on the morphology and optical properties of CH3NH3PbI3 films, and a regular morphology evolution was observed. Further, temperature-dependent photoluminescence measurement was performed, and a structural phase transition of the CH3NH3PbI3 films at 150 K was revealed by examining the temperature dependence of the peak positions and widths. In addition, the corresponding exciton binding energy and optical phonon energy of the CH3NH3PbI3 films were extracted in the high-temperature tetragonal phase based on the experimental data. It can be anticipated that our results obtained provide valuable information for the understanding on the optical properties of perovskite CH3NH3PbI3, and also their future applications in optoelectronic devices. (C) 2017 Elsevier B. V. All rights reserved.
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