1. Department of Physics and Astronomy, and Wright Center for Photovoltaics Innovation and Commercialization (PVIC); University of Toledo; Toledo OH 43606 USA
2. Department of Physics; College of Education for Pure Sciences; Tikrit University; Tikrit, Salahuddin 34001 Iraq
3. Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information; Huazhong University of Science and Technology (HUST); Wuhan 430074 P. R. China
4. Department of Aeronautics and Astronautics; National Cheng Kung University; Tainan 70101 Taiwan
5. Department of Physics, and Material Science, Engineering, and Commercialization Program; Texas State University; San Marcos TX 78666 USA