1. Department of Materials Science and Engineering, Materials Research Institute The Pennsylvania State University University Park PA 16802 USA
2. Department of Electrical Engineering, Materials Research Institute The Pennsylvania State University University Park PA 16802 USA
3. Department of Mechanical Engineering and Materials Science and Engineering Program University of Texas at Austin One University Station, C2200 Austin TX 78712 USA
4. Materials Research Institute The Pennsylvania State University University Park PA 16802 USA
5. Department of Electrical Engineering, Department of Materials Science and Engineering, Materials Research Institute The Pennsylvania State University University Park PA 16802 USA
6. School of Materials Science and Engineering Tsinghua University Beijing 100084 P. R. China