標題: Structural and Photophysical Properties of Methylammonium Lead Tribromide (MAPbBr(3)) Single Crystals
作者: Wang, Kai-Hung
Li, Liang-Chen
Shellaiah, Muthaiah
Sun, Kien Wen
應用化學系
電子工程學系及電子研究所
奈米科技中心
Department of Applied Chemistry
Department of Electronics Engineering and Institute of Electronics
Center for Nanoscience and Technology
公開日期: 20-Oct-2017
摘要: The structural and photophysical characteristics of MAPbBr(3) single crystals prepared using the inverse temperature crystallization method are evaluated using temperature-dependent X-ray diffraction (XRD) and optical spectroscopy. Contrary to previous research reports on perovskite materials, we study phase transitions in crystal lattice structures accompanied with changes in optical properties expand throughout a wide temperature range of 300-1.5 K. The XRD studies reveal several phase transitions occurred at similar to 210 K, similar to 145 K, and similar to 80 K, respectively. The coexistence of two different crystallographic phases was observed at a temperature below 145 K. The emission peaks in the PL spectra are all asymmetric in line shape with weak and broad shoulders near the absorption edges, which are attributed to the Br atom vacancy on the surface of the crystals. The time-resolved PL measurements reveal the effect of the desorption/adsorption of gas molecules on the crystal surface on the PL lifetimes. Raman spectroscopy results indicate the strong interplays between cations and different halide atoms. Lastly, no diamagnetic shift or split in emission peaks can be observed in the magneto-PL spectra even at an applied magnetic field up to 5 T and at a temperature as low as 1.5 K.
URI: http://dx.doi.org/10.1038/s41598-017-13571-1
http://hdl.handle.net/11536/143957
ISSN: 2045-2322
DOI: 10.1038/s41598-017-13571-1
期刊: SCIENTIFIC REPORTS
Volume: 7
起始頁: 0
結束頁: 0
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