Table of Contents
Journal of Photonics
Volume 2014, Article ID 327586, 7 pages
http://dx.doi.org/10.1155/2014/327586
Research Article

Simulation and Measurement of Solar Harvesting Enhancement of Silver Plasmonic Nanoparticles on GaSb Nanodots

1Applied Plasmonics (H34), Centre for Micro-Photonics, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, P.O. Box 218, Hawthorn, VIC 3122, Australia
2Melbourne Centre for Nanofabrication (MCN), Australian National Fabrication Facility (ANFF), Clayton, VIC 3168, Australia
3FCIPT, Institute for Plasma Research, Gandhinagar, Gujarat 382 428, India
4School of Engineering, Deakin University, Geelong, VIC 3216, Australia

Received 31 October 2013; Revised 12 February 2014; Accepted 26 February 2014; Published 24 March 2014

Academic Editor: Philippe Delaporte

Copyright © 2014 Lorenzo Rosa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The performance of a plasmonic antireflection layer which can be utilized for deep-space radiationresistant GaSb solar cells is investigated numerically and experimentally. The layer consists of nanodots made by plasma etching of a GaSb substrate and subsequent physical vapor deposition of Ag nanoparticles on the nanodot tips, in a partially ordered configuration determined by the plasma energy level. This technique is readily applicable to patterning of silicon. We measure the substrate reflectivity and model the reflection and absorption of the substrates using the 3D finite difference time domain (FDTD) method, which are realistically imported as 3D layers from the scanning electron microscopy (SEM) images. The variation of the height of the Ag nanoparticles on top of the GaSb pillars shows that the plasmonic effect remarkably enhances the absorption. The presence of GaSb pillars enhances absorption and tunes the maximum absorption wavelength peak.