Photodetector Fabrication by Dielectrophoretic Assembly of GaAs Nanowires Grown by a Two-steps Method

García Nuñez, C. , Braña, A. F., Lopez, N., Pau, J. L. and García, B. J. (2017) Photodetector Fabrication by Dielectrophoretic Assembly of GaAs Nanowires Grown by a Two-steps Method. In: Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017, San Diego, CA, USA, 09-10 Aug 2017, 103530F. ISBN 9781510611634 (doi: 10.1117/12.2274007)

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GaAs nanowires (NWs) are promising advanced materials for the development of high performance photodetectors in the visible and infrared range. In this work, we optimize the epitaxial growth of GaAs NWs compared to conventional procedures, by introducing a novel two-steps growth method that exhibits an improvement of the resulting NW aspectratio and an enhancement of the NW growth rate. Moreover, we investigate the contactless manipulation of NWs using non-uniform electric fields to assemble a single GaAs NW on conductive electrodes, resulting in assembly yields above 90%/site and an alignment yields of around 95%. The electrical characteristics of the dielectrophoretic contact formed between the NW and the electrode have been measured, observing that the use of n-type Al-doped ZnO (AZO) as electrode material for NW alignment produces Schottky barrier contacts with the GaAs NW body. Moreover, our results show the fast fabrication of diodes with rectifying characteristics due to the formation of a low-resistance contact between the Ga catalytic droplet at the tip of the NW and the AZO electrode. The current-voltage measurements of a single GaAs NW diode under different illumination conditions show a strong light responsivity of the forward bias characteristic mainly produced by a change on the series resistance.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Garcia Nunez, Dr Carlos
Authors: García Nuñez, C., Braña, A. F., Lopez, N., Pau, J. L., and García, B. J.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Published Online:29 August 2017
Copyright Holders:Copyright © 2017 Society of Photo-Optical Instrumentation Engineers
First Published:First published in Proceedings of SPIE 10353: 103530F
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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