Enlarged Photodetection Using ${\rm SiO}_{x}$ Nanowire Arrays

We have synthesized perpendicular SiOx nanowire (NW) arrays on Si substrates and investigated them using scanning electron microscopy. Transmission electron microscopy and energy-dispersive spectroscopy have been used to investigate the single NW structure. A near-infrared emission at 700 nm is observed. In/SiOx NW and In/SiOx thin film (TF) contacts exhibit Schottky behavior. The SiOx NW-based devices show six-fold improvements in photodetection efficiency in white-light illumination, compared to SiOx TF-based devices under reverse bias condition.

[1]  Zhong Lin Wang,et al.  Single-crystalline branched zinc phosphide nanostructures: synthesis, properties, and optoelectronic devices. , 2007, Nano letters.

[2]  J. Myoung,et al.  Junction Properties and Applications of ZnO Single Nanowire Based Schottky Diode , 2011 .

[3]  J. Myoung,et al.  ZnO single nanowire-based UV detectors , 2010 .

[4]  Zhong Lin Wang,et al.  Large enhancement in photon detection sensitivity via Schottky-gated CdS nanowire nanosensors , 2010 .

[5]  Youfan Hu,et al.  Supersensitive, Fast-Response Nanowire Sensors by Using Schottky Contacts , 2010 .

[6]  Chun‐Sing Lee,et al.  Ultrafine and uniform silicon nanowires grown with zeolites , 2002 .

[7]  P. Pignalosa,et al.  Graded index and randomly oriented core-shell silicon nanowires for broadband and wide angle antireflection , 2011, 1108.1088.

[8]  R. Ruoff,et al.  SIMPLE AND CATALYST-FREE SYNTHESIS OF SILICON OXIDE NANOWIRES AND NANOCOILS , 2007 .

[9]  T. Jimbo,et al.  Synthesis of core-shell SiO x /carbon nanofibers on silicon substrates by ultrasonic spray pyrolysis , 2012 .

[10]  Y. G. Wang,et al.  Adsorption and desorption of oxygen probed from ZnO nanowire films by photocurrent measurements , 2005 .

[11]  K. Cheong,et al.  Formation and characterization of SiOx nanowires and Si/SiOx core-shell nanowires via carbon-assisted growth , 2010 .

[12]  J. C. Dhar,et al.  Ultraviolet detection using TiO2 nanowire array with Ag Schottky contact , 2012 .

[13]  Harold S. Park,et al.  A continuum model for the mechanical behavior of nanowires including surface and surface-induced initial stresses , 2011 .

[14]  Yiping Zhao,et al.  Designing nanostructures by glancing angle deposition , 2003, SPIE Optics + Photonics.

[15]  P. Ajayan,et al.  Creation of Radial Patterns of Carbonated Silica Fibers on Planar Silica Substrates , 2001 .

[16]  E. Monroy,et al.  Wide-bandgap semiconductor ultraviolet photodetectors , 2003 .

[17]  Gustaaf Borghs,et al.  ITON Schottky contacts for GaN based UV photodetectors , 2006 .