Photoacoustic operation modes for determination of absorption spectra of SiGe mixed crystals |
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Authors: | M?Maliński ??Chrobak |
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Institution: | (1) Indian Institute of Technology Madras, Chennai, 600036, India;(2) Raman Research Institute, Bangalore, 560080, India; |
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Abstract: | This paper presents comparison of two photoacoustic modes of determination of optical absorption spectra of semiconductors
illustrated with the results obtained for SiGe crystals. Experimental transmission and absorption photoacoustic spectra of
SiGe crystals as well as appropriate models for determination of optical absorption coefficient spectra are given. The idea
and experimental set-up of the analyzed methods are presented too. From the fitting procedure of theoretical characteristics
to experimental transmission and absorption photoacoustic spectra and after computations of the optical absorption coefficient
spectra, three components of the optical absorption coefficient spectra of SiGe crystals were identified, i.e., band to band
transitions, Urbach tail and free carriers absorption. Their parameters are given and discussed in the paper. At the end,
the advantages and disadvantages of both methods are discussed. To the best of our knowledge, such a comparison of the two
PA methods of determination of the optical absorption spectra has not been done before. |
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Keywords: | |
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