EDP Sciences Journals List
Home Document
Subscriber Authentication Point
Issue Eur. Phys. J. Appl. Phys.
Volume 44, Number 2, November 2008
Page(s) 137 - 141
Section Surfaces, Interfaces and Films
DOI 10.1051/epjap:2008159
Published online 25 September 2008

Eur. Phys. J. Appl. Phys. 44, 137-141 (2008)
DOI: 10.1051/epjap:2008159

Ellipsometrically determination of the optical constants of ZnO in ZnO/Ag/ZnO multilayer system

S.H. Mohamed and S.A. Ahmed

Physics Department, Faculty of Science, Sohag University, 82524 Sohag, Egypt

abo_95@yahoo.com

Received: 19 March 2008 / Received in final form: 19 May 2008 / Accepted: 27 June 2008 / Published online: 25 September 2008

Abstract
The variable angle spectroscopic ellipsometer in conjunction with computer simulation were employed to determine the optical constants of ZnO in the ZnO/Ag/ZnO (ZAZ) multilayer system. A five-phase, glass/ZnO/Ag/ZnO/air, model was used to fit the calculated data to the experimental spectra. The ellipsometrically determined ZnO and Ag layers thicknesses were found to be agreed well with those previously determined by X-ray reflectivity. The effects of Ag layer thickness (Agd) and ZnO top layer thickness (ZnOd) on the optical constants of ZnO in the ZAZ multilayer system were discussed. The refractive index values determined at 550 nm, remains almost constant as Agd increases while the refractive index values decrease with decreasing ZnOd. Over the whole visible spectral range the extinction coefficient values of the Agd group are very close to zero and does not depend on Agd while the extinction coefficient values of the ZnOd group increase with decreasing ZnOd. The optical band gap values are found to be affected strongly by both Agd and ZnOd.

PACS
78.66.-w - Optical properties of specific thin films.
78.67.Pt - Multilayers; superlattices.

© EDP Sciences 2008


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.