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Optical properties of the ternary compound Tl Sb S2 |
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| Institution: | 1. Division of Cardiovascular Medicine, Department of Internal Medicine, Kobe University Graduate School of Medicine, Kobe, Japan;2. Department of Cardiology, Hyogo Prefectural Awaji Medical Center, Sumoto, Japan;3. Clinical & Translational Research Center, Kobe University Hospital, Kobe, Japan;4. Division of Epidemiology, Kobe University Graduate School of Medicine, Kobe, Japan;5. Division of Evidence-based Laboratory Medicine, Kobe University Graduate School of Medicine, Kobe, Japan |
| Abstract: | We present an investigation of the near band-gap optical properties of TlSbS2 between 2 and 300 K. We use both transmission and reflectivity measurements. The resolution of the first exciton line permits to obtain an accurate determination of the temperature coefficients of both the direct band-gap E0 and the second threshold E1. The absorption curves have been fitted according to the Toyozawa's model. We find a strong interaction with a phonon mode of energy 22 meV for both the E0 and E1 thresholds. The low temperature reflectivity spectra reveal clearly several direct transitions in the range 1.5–5.5 eV. All these structures have been identified as transitions between the highest valence band and the lowest conduction band. |
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