Photoacoustic Investigation of Absorption Edge of Cd1-xMgxSe Mixed Crystals
F. Firszta, S. Łęgowskia, H. Męczyńskaa, B. Sekulskaa, J. Szatkowskia, J. Zakrzewskia and W. Paszkowiczb
aInstitute of Physics, N. Copernicus University, Grudziadzka 5/7, 87-100 Toruń, Poland
bInstitute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland
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The Cd1-xMgxSe crystals were grown by modified Bridgman method for x ranging from 0 to 0.44. The photoacoustic spectroscopy was employed for evaluation of the band gaps of series Cd1-xMgxSe mixed crystals with different composition. The photoacoustic spectra were measured at 300 K and 90 K using continuous wave excitation in the range from 400 nm to 800 nm. The increase in the band-gap energy with increasing Mg content is observed. The photoacoustic results are compared with photoluminescence and transmission spectra.
DOI: 10.12693/APhysPolA.92.749
PACS numbers: 62.65.+k, 78.20.Hp, 78.55.Et