articleAdvanced Functional MaterialsSep 3, 2023HYBRID OA

Limitations of the Tauc Plot Method

JKJulian KleinLKLaura KampermannBMBenjamin MockenhauptMBMalte BehrensJSJennifer Strunk

University of Duisburg-Essen · Delft University of Technology · +3 more institutions

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Abstract

Abstract The Tauc plot is a method originally developed to derive the optical gap of amorphous semiconductors such as amorphous germanium or silicon. By measuring the absorption coefficient α ( hν ) and plotting versus photon energy hν , a value for the optical gap ( Tauc gap ) is determined. In this way non‐direct optical transitions between approximately parabolic bands can be examined. In the last decades, a modification of this method for (poly‐) crystalline semiconductors has become popular to study direct and indirect interband transitions. For this purpose, ( ahν ) n ( n = , 2) is plotted against hν to determine a value of the electronic bandgap . Due to the ease of performing UV–vis measurements, this…

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Topics & keywords

Topics
Keywords
  • Band gap
  • Materials science
  • Amorphous solid
  • Semiconductor
  • Germanium
  • Direct and indirect band gaps
  • Attenuation coefficient
  • Plot (graphics)
UN Sustainable Development Goals
  • Affordable and clean energy
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