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Strong piezoelectricity in individual GaN nanowires

Majid Minary-Jolandana1, Rodrigo A. Bernala1 and Horacio D. Espinosaa1 c1

a1 Department of Mechanical Engineering, Northwestern University, Evanston, Illinois 60208-3111

Abstract

GaN nanowires are promising building blocks for future nanoelectronics, optoelectronic devices, and nanogenerators. Here, we report on strong piezoelectricity in individual single-crystal GaN nanowires revealed by direct measurement of the piezoelectric constant using piezoresponse force microscopy. Our experimental results show that individual c-axis GaN nanowires, with a characteristic dimension as small as 65 nm, show a shear piezoelectric constant of d15 ~ 10 pm/V, which is several times that measured in bulk. The revealed strong piezoelectricity could open promising opportunities for application of GaN nanowires in nanowire-based sensors and generators for self-powered nanodevices.

(Received July 12 2011)

(Accepted September 15 2011)

Correspondence:

c1 Address all correspondence to Horacio D. Espinosa at espinosa@northwestern.edu

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