Effect of GaN-Based Distributed Bragg Reflector on Optical Properties of CH 3 NH 3 PbBr 3 Crystals

Feng Jiang (), Yiwei Duan, Jiawen Song and Zhe Luo
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Feng Jiang: Faculty of Electronic information and Electrical Engineering, Dalian University of Technology, Dalian 116024, China
Yiwei Duan: School of Physics, Dalian University of Technology, Dalian 116024, China
Jiawen Song: School of Physics, Dalian University of Technology, Dalian 116024, China
Zhe Luo: School of Physics, Dalian University of Technology, Dalian 116024, China

Energies, 2023, vol. 16, issue 12, 1-11

Abstract: As a photoelectric material, the luminescent efficiency improvement of organic–inorganic perovskite material is a hot topic. This work fabricated a nanoporous distributed Bragg reflector based on GaN with a periodic structure using electrochemical etching methods. Considering the fact that hybrid perovskite materials are difficult to prepare on an inorganic GaN-based substrate, ultraviolet ozone treatment was implemented to enhance the surface activity of the prepared distributed Bragg reflector substrate. Cubic CH 3 NH 3 PbBr 3 crystals with smooth surfaces and precise edges were successfully prepared on the ozone-treated distributed Bragg reflector substrate by a two-step immersion method in the air environment. The structural property of the prepared CH 3 NH 3 PbBr 3 crystals was investigated using X-ray diffraction, scanning electron microscopy and Fourier-transform infrared spectroscopy. The structural analysis results showed that CH 3 NH 3 PbBr 3 crystals grown on the prepared distributed Bragg reflector and reference substrates have the same structure, with a good crystal quality. The photoluminescence intensity of CH 3 NH 3 PbBr 3 crystals grown on the distributed Bragg reflector was significantly enhanced. The enhancement is approximately 3.11-fold compared with CH 3 NH 3 PbBr 3 crystals grown on the unetched reference GaN substrate. Moreover, there is a 7.2 nm spectral blue shift. The enhancement of the photoluminescence intensity could be attributed to the out-coupling of emission light in the prepared crystals, and the blue shift could be attributed to the stress relaxation caused by the nanoporous GaN structure of the distributed Bragg reflector substrate.

Keywords: CH 3 NH 3 PbBr 3 crystals; photoluminescence enhancement; GaN-based distributed Bragg reflector (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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