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