1. a Materials Research Institute and Materials Science and Engineering Department , Penn State University, Materials Research Laboratory, The Pennsylvania State University , University Park , Pennsylvania , 16802 , USA
2. b Center for Thin Film Devices and Department of Electrical Engineering, Electrical Engineering East , The Pennsylvania State University , University Park , Pennsylvania , 16802 , USA
3. c Department of Computer Science and Engineering , The Pennsylvania State University , University Park , Pennsylvania , 16802 , USA
4. d Applied Research Laboratory , The Pennsylvania State University , University Park , Pennsylvania , 16802 , USA