Comparative study of optical analysis methods for thin films
| Autor: | Jungseek Hwang, Jin Cheol Park, Jaegang Jo, Eilho Jung |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Optical spectra Quartz substrate Condensed Matter::Superconductivity 0103 physical sciences General Materials Science Thin film 0210 nano-technology Absorption (electromagnetic radiation) Analysis method Transmittance spectra |
| Zdroj: | Current Applied Physics. 20:237-243 |
| ISSN: | 1567-1739 |
| DOI: | 10.1016/j.cap.2019.11.010 |
| Popis: | Three popular optical analysis methods (the transfer-matrix method, the Tinkham formula, and Beer's law) have been used for analyzing the optical spectra of thin films. While the transfer-matrix method is an accurate method, the Tinkham formula and Beer's law are approximate methods. Here we investigated the three methods using measured transmittance spectra of insulating transition-metal dichalcogenide (TMD) thin films on a quartz substrate. Three different semiconducting 2H-TMD systems (MoS2, MoSe2, and MoTe2) were measured and analyzed. The optical conductivities obtained from the measured transmittance spectra using the transfer-matrix method and Tinkham formula and the absorption coefficients obtained using the transfer-matrix method and Beer's law were compared. The comparisons show some discrepancies. The reasons for the discrepancies between the results obtained via the two different methods were examined and the application limitations of the Tinkham formula and Beer's law were discussed. |
| Databáze: | OpenAIRE |
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