1 Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
2 Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.
3 Department of Electrical and Computer Engineering, University of Illinois, Urbana-Champaign, Urbana, IL 61801, USA.
4 Department of Materials Science and Engineering, University of Illinois, Urbana-Champaign, Urbana, IL 61801, USA.
5 Department of Mechanical Science and Engineering, University of Illinois, Urbana-Champaign, Urbana, IL 61801, USA.
6 Department of Bioengineering, University of Illinois, Urbana-Champaign, Urbana, IL 61801, USA.
7 Materials Research Laboratory, University of Illinois, Urbana-Champaign, Urbana, IL 61801, USA.
8 Beckman Institute for Advanced Science and Technology, University of Illinois, Urbana-Champaign, Urbana, IL 61801, USA.
9 Nick Holonyak Micro and Nanotechnology Laboratory, University of Illinois, Urbana-Champaign, Urbana, IL 61801, USA.
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