Crystal structure and optical performance in bulk γ-InSe single crystals
Min Wu,
Qiyun Xie,
Yizhang Wu,
Jiajin Zheng,
Wei Wang,
Liang He,
Xiaoshan Wu,
Bin Lv
Affiliations
Min Wu
Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province, Nanjing University of Posts & Telecommunications, Nanjing 210023, China
Qiyun Xie
Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province, Nanjing University of Posts & Telecommunications, Nanjing 210023, China
Yizhang Wu
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Jiajin Zheng
Key Laboratory of Radio Frequency and Micro-Nano Electronics of Jiangsu Province, Nanjing University of Posts & Telecommunications, Nanjing 210023, China
Wei Wang
Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
Liang He
Jiangsu Provincial Key Laboratory of Advanced Photonic and Electronic Materials, Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China
Xiaoshan Wu
National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Bin Lv
Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China
High purity γ-phase InSe single crystals have been synthesized and characterized by XRD, SEM, EDS and TEM. Detailed temperature dependent Raman and photoluminescence spectroscopy suggests a small blue-shift as temperature decreases. The corresponding blue shift in Raman and photoluminescence can be explained in terms of self-energy and the lattice parameter change induced variation of band gap, respectively. Moreover, bulk InSe exhibits photoresponsivity in a wide spectrum from 400 to 990 nm. The maximum photoresponsivity reaches up to 8.82 mA/W under the wavelength of 800 nm, which is consistent with high absorption at the wavelength.
