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Transparent Conductive Oxide Materials

  • Hiroyuki FujiwaraEmail author
  • Shohei Fujimoto
Chapter
  • 688 Downloads
Part of the Springer Series in Optical Sciences book series (SSOS, volume 212)

Abstract

For most of solar cell devices, a transparent conductive oxide (TCO) electrode is a vital component. Nevertheless, free carrier and interband transitions that occur within TCO layers reduce the short-circuit current density (Jsc) rather significantly. Thus, the suppression of the parasitic optical absorption in TCO layers is crucial in improving solar cell efficiencies. The free carrier absorption in all TCO materials can be described by the simple Drude model in which absorption characteristics of free electrons are expressed based on two parameters: i.e., optical carrier concentration and optical mobility. From these parameters, the carrier transport properties of TCO materials can further be studied. In this chapter, the optical transitions and physics of free electrons in various TCO materials are reviewed. In particular, the variation of TCO optical constants with carrier concentration is explained in detail. This chapter further introduces ellipsometry analyses of various TCO layers. The ellipsometry characterization examples described here include the analyses of standard (thin) layers, thicker layers, and textured layers. From the absorption features derived from theoretical treatments summarized in this chapter, Jsc loss in actual solar cells can be estimated.

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Authors and Affiliations

  1. 1.Gifu UniversityGifuJapan

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