Communications - Scientific Letters of the University of Zilina 2017, 19(3):9-15 | DOI: 10.26552/com.C.2017.3.9-15

On Some Ambiguities of the Absorption Edge and Optical Band Gaps of Amorphous and Polycrystalline Semiconductors

Jarmila Mullerova1, Pavol Sutta2
1 Institute of Aurel Stodola, Faculty of Electrical Engineering, University of Zilina Liptovsky Mikulas, Slovakia
2 New Technologies - Research Centre, University of West Bohemia, Plzen, Czech Republic

This paper reports on somewhat puzzling character of the determination of the optical band gap energies of amorphous and polycrystalline semiconductors, where probably the mixed-phase composition and structural and compositional disorder are main reasons for the ambiguities. The analysis is performed using spectra of absorption coefficients of the featured samples of Si:H and Zn-Ti-O extracted by numerical analysis of transmittance measurements. The differences originating from using several procedures to process spectra of absorption coefficients are discussed.

Keywords: absorption coefficient; thin film; microstructure; optical band gap; Tauc; Cody; Sokolov

Published: September 30, 2017  Show citation

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Mullerova, J., & Sutta, P. (2017). On Some Ambiguities of the Absorption Edge and Optical Band Gaps of Amorphous and Polycrystalline Semiconductors. Communications - Scientific Letters of the University of Zilina, 19(3), 9-15. doi: 10.26552/com.C.2017.3.9-15
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