1. Graduate School of Science and Technology, Shizuoka University , Hamamatsu, Japan
2. Department of Physics, Jagannath University , Dhaka, Bangladesh
3. Department of Electronics and Materials Science, Shizuoka University , Hamamatsu, Japan
4. Materials Science Division, Atomic Energy Centre , Dhaka, Bangladesh
5. Research Institute of Electronics, Shizuoka University , Hamamatsu, Japan
6. School of Materials and Chemical Technology, Tokyo Institute of Technology , Tokyo, Japan