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Sketch of the experimental setup. Incident, reflected, and transmitted light intensities are measured by photodiodes PD1, PD2, and PD3, respectively.
Calculated optical absorption vs wavelength from measured intensities using Eq. (1) (solid line) or an exact approach (circles).
Absorption spectra at temperatures between 27 and (with increments of ).
Absorption coefficients vs temperature at various wavelengths.
Calculated direct band-gap energy vs temperature.
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