title: Nanogenerators based on vertically aligned InN nanowires.
abstract: Piezoelectric nanogenerators (NGs) based on vertically aligned InN nanowires (NWs) are fabricated, characterized, and evaluated. In these NGs, arrays of p-type and intrinsic InN NWs prepared by plasma-assisted molecular beam epitaxy (MBE) demonstrate similar piezoelectric properties. The p-type NGs show 160% more output current and 70% more output power product than the intrinsic NGs. The features driving performance enhancement are reduced electrostatic losses due to better NW array morphology, improved electromechanical energy conversion efficiency due to smaller NW diameters, and the higher impedance of intrinsic NGs due to elevated NW surface charge levels. These findings highlight the potential of InN based NGs as a power source for self-powered systems and the importance of NW morphology and surface state in overall NG performance.
authors.affiliation: Department of Electrical and Computer Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L3G1, Canada. g37liu@uwaterloo.ca dban@uwaterloo.ca.
authors.forename: Guocheng
authors.initials: G
authors.lastname: Liu
authors.affiliation: Department of Electrical and Computer Engineering, McGill University, Montreal, Quebec H3A 0E9, Canada.
authors.forename: Songrui
authors.initials: S
authors.lastname: Zhao
authors.affiliation: Department of Physics & Astronomy, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
authors.forename: Robert D E
authors.initials: RD
authors.lastname: Henderson
authors.affiliation: Department of Physics & Astronomy, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
authors.forename: Zoya
authors.initials: Z
authors.lastname: Leonenko
authors.affiliation: Department of Systems Design Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
authors.forename: Eihab
authors.initials: E
authors.lastname: Abdel-Rahman
authors.affiliation: Department of Electrical and Computer Engineering, McGill University, Montreal, Quebec H3A 0E9, Canada.
authors.forename: Zetian
authors.initials: Z
authors.lastname: Mi
authors.affiliation: Department of Electrical and Computer Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Ave. West, Waterloo, Ontario N2L3G1, Canada. g37liu@uwaterloo.ca dban@uwaterloo.ca.
authors.forename: Dayan
authors.initials: D
authors.lastname: Ban