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Proceedings Paper

Photodetector fabrication by dielectrophoretic assembly of GaAs nanowires grown by a two-steps method
Author(s): Carlos García Núñez; Alejandro F. Braña; Nair López; José L. Pau; Basilio J. García
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Paper Abstract

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.

Paper Details

Date Published: 29 August 2017
PDF: 13 pages
Proc. SPIE 10353, Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017, 103530F (29 August 2017); doi: 10.1117/12.2274007
Show Author Affiliations
Carlos García Núñez, Univ. Autónoma de Madrid (Spain)
Univ. of Glasgow (United Kingdom)
Alejandro F. Braña, Univ. Autónoma de Madrid (Spain)
Nair López, Univ. Autónoma de Madrid (Spain)
José L. Pau, Univ. Autónoma de Madrid (Spain)
Basilio J. García, Univ. Autónoma de Madrid (Spain)

Published in SPIE Proceedings Vol. 10353:
Optical Sensing, Imaging, and Photon Counting: Nanostructured Devices and Applications 2017
Manijeh Razeghi; Oleg Mitrofanov; José Luis Pau Vizcaíno; Chee Hing Tan, Editor(s)

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