Photodetector fabrication by dielectrophoretic assembly of GaAs nanowires grown by a two-steps method

Carlos García Núñez, Alejandro F. Braña, Nair Lopez, José L. Pau, Basilio J. García

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)
23 Downloads (Pure)


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 90site 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.
Original languageEnglish
Title of host publicationOptical Sensing, Imaging, and Photon Counting
Subtitle of host publicationNanostructured Devices and Applications 2017
EditorsManijeh Razeghi, Oleg Mitrofanov, Jose Luis Pau Vizcaino, Chee Hing Tan
PublisherSociety of Photo-Optical Instrumentation Engineers
ISBN (Electronic)9781510611641
ISBN (Print)9781510611634
Publication statusPublished - 19 Sept 2017
Externally publishedYes

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


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