ACTA

Photoacoustic Investigation of Absorption Edge of Cd_1-xMg_xSe Mixed Crystals

F. Firszt^a, S. Łęgowski^a, H. Męczyńska^a, B. Sekulska^a, J. Szatkowski^a, J. Zakrzewski^a and W. Paszkowicz^b
^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 Cd_1-xMg_xSe 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 Cd_1-xMg_xSe 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