College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007;
Henan Province Key Laboratory of Photovoltaic Materials, Xinxiang 453007;
College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007;
Henan Province Key Laboratory of Photovoltaic Materials, Xinxiang 453007;
College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007;
Henan Province Key Laboratory of Photovoltaic Materials, Xinxiang 453007;
College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007;
Henan Province Key Laboratory of Photovoltaic Materials, Xinxiang 453007;