Institution: | 1.School of Physical Science & Engineering and Key Laboratory of Materials Physics of Ministry of Education of China, Zhengzhou University, Zhengzhou 450051, China;2.College of Science, Center of Analysis and Testing of Henan Institute of Engineering, Zhengzhou 451191, China;3.Key Laboratory of Photovoltaic Materials of Henan Province and School of Physics and Electronics, Henan University, Kaifeng 475004, China |