1. Department
of Electrical and Computer Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
2. Department
of Chemical and Biological Engineering, University of Wisconsin—Madison, 1415 Engineering Drive, Madison, Wisconsin 53706, United States
3. NanoPower
Research Labs, Rochester Institute of Technology, 156 Lomb Memorial Drive, Rochester, New York 14623, United States
4. Firefly Technologies, 2082 Hackberry
Lane, Shakopee, Minnesota 55379, United States