1. Advanced Electronic Materials Institute; General Research Institute for Nonferrous Metals; Beijing 100088 P.R. China
2. Center for Computing and Simulation of Advanced Materials and State Key Laboratory of Nonferrous Metals and Processes; General Research Institute for Nonferrous Metals; Beijing 100088 P.R. China
3. Key Laboratory of Microelectronics Devices and Integrated Technology; Institute of Microelectronics; Chinese Academy of Sciences; Beijing 100029 P.R. China