1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
2. Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu FI-90014, Finland
3. College of Information Science and Engineering, Guilin University of Technology, Guilin 541004, China
4. Materials and Physics Research Centre, School of Computing, Science & Engineering, University of Salford, The Crescent, Salford M5 4WT, U.K.