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School of Physics and Electronic Information, Luoyang Normal College, Luoyang, Henan 471022, PR China
School of physics and Electronics, Institute of Microsystem, and Key Lab for Photovoltaic Materials of Henan Province, Henan University, Kaifeng 475004, PR China
School of physics and Electronics, Institute of Microsystem, and Key Lab for Photovoltaic Materials of Henan Province, Henan University, Kaifeng 475004, PR China
Key Laboratory of Artificial Micro, and Nano-structures of Ministry of Education and School of Physics and Technology, Wuhan University, Wuhan 430072, PR China