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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 4, Iss. 1 — Jan. 1, 2014
  • pp: 43–56

Investigation into inhomogeneous electrical and optical properties of indium tin oxide film using spectroscopic ellipsometry with multi-layer optical models

Kun-San Tseng and Yu-Lung Lo  »View Author Affiliations


Optical Materials Express, Vol. 4, Issue 1, pp. 43-56 (2014)
http://dx.doi.org/10.1364/OME.4.000043


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Abstract

Indium tin oxide (ITO) films with various thicknesses are deposited on glass substrates using a DC magnetron sputtering technique. The microstructure and chemical composition of the sputtered samples are examined by scanning electron microscopy (SEM), X-Ray Diffraction (XRD) and Energy Dispersive X-Ray Spectroscopy (EDS). Two-layer and three-layer optical models of the sputtered ITO films are constructed for fitting the experimental results of the spectroscopic ellipsometry. The results obtained from the two models for the resistivity, carrier density and carrier mobility are compared with those obtained via Hall effect measurements. Finally, the three-layer optical model is used to evaluate the refractive index and extinction coefficient spectra of the various samples. In general, the present results show that the three-layer model, in which the transition layer between the ITO film and the glass substrate is included, provides a better approximation of the SE results than the two-layer model. However, both models yield a reasonable estimate of the Hall resistivity. The results obtained using the three-layer model show that the carrier density and carrier mobility in the bulk layer are lower and higher, respectively, than those in the transition layer. In addition, it is shown that the refractive index of the bulk layer is lower than that of the transition layer in the UV and visible spectrum. Moreover, the extinction coefficient of the transition layer is significantly higher than that of the bulk layer in the near IR-region.

© 2013 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(310.7005) Thin films : Transparent conductive coatings

ToC Category:
Transparent conductive coatings

History
Original Manuscript: November 18, 2013
Revised Manuscript: November 26, 2013
Manuscript Accepted: November 26, 2013
Published: December 9, 2013

Citation
Kun-San Tseng and Yu-Lung Lo, "Investigation into inhomogeneous electrical and optical properties of indium tin oxide film using spectroscopic ellipsometry with multi-layer optical models," Opt. Mater. Express 4, 43-56 (2014)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-4-1-43


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