Metal/metal-oxide nanocoatings on black silicon nanograss for enhanced solar absorption and photochemical activity

Pabitra Dahal, Raquel Flores, Elangovan Elamurugu, Nitul Rajput, Mustapha Jouiad, Jaime Viegas

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

In this work, we present experimental results showing optical absorption enhancement of silicon wafer through etching and metal/metal-oxide nanolayers deposition. Black silicon nanograss were fabricated from single crystalline silicon by reactive ion etching, and ZnO, Pt, and CeO2 nanolayers were deposited through atomic layer deposition as well as magnetron sputtering. The resulting structure exhibits less than 8% reflection over broadband solar spectrum. The fabricated structures are analyzed by scanning electron microscope, focused ion beam milling slice and view and transverse electron microscope sample preparation. The results are compared to finite difference time domain simulations based on the actual fabricated structures. A study of the influence of various parameters on the geometry of the fabricated micro and nanostructures and the corresponding change in optical properties is also presented. Applications of such highly absorbing metamaterials to solar photocatalysis is discussed.

Original languageBritish English
Title of host publicationPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices V
EditorsMasakazu Sugiyama, Alexandre Freundlich, Laurent Lombez
PublisherSPIE
ISBN (Electronic)9781628419788
DOIs
StatePublished - 2016
EventPhysics, Simulation, and Photonic Engineering of Photovoltaic Devices V - San Francisco, United States
Duration: 15 Feb 201617 Feb 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9743
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhysics, Simulation, and Photonic Engineering of Photovoltaic Devices V
Country/TerritoryUnited States
CitySan Francisco
Period15/02/1617/02/16

Keywords

  • Black silicon
  • Metamaterial
  • Nanocoating
  • Photocatalysis

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