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Proceedings Paper

Energy bands and Wannier-Mott excitons in Zn(P1-xAsx)2 and Zn1-xCdxP2 crystals
Author(s): O. A. Yeshchenko; M. M. Biliy; Z. Z. Yanchuk
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Paper Abstract

Excitonic absorption, reflection and photoluminescence spectra of mixed Zn(P1-χAsχ)2 crystals over the full range of χ (0 ≤ χ 1) and Zn1-χ CdχP2 crystals at 0 ≤ χ ≤ 0.05 have been studied at low temperatures (1.8 K). The decrease of the energy gap in Zn(P1-χAsχ)2 at the increase of χ occurs slightly sublinearly. The rydbergs of excitonic series in this crystals decrease as well, and the dependences Ry(χ) for all series are strongly superlinear at small χ. In Zn(P1-χAsχ)2 crystals the energy gap and rydbergs decrease at the increase of χ (at 0 ≤ χ ≤ 0.05) as well. The dependences of Eg and Ry on χ are considerably stronger in Zn(P1-χAsχ)2 than in Zn1-χCdχP2. At the increase of χ the half-width of excitonic absorption lines increases monotonically in both type crystals that is evidence of the increasing role of fluctuations of crystal potential.

Paper Details

Date Published: 20 July 2004
PDF: 11 pages
Proc. SPIE 5507, XVI International Conference on Spectroscopy of Molecules and Crystals, (20 July 2004); doi: 10.1117/12.570025
Show Author Affiliations
O. A. Yeshchenko, Taras Shevchenko National Univ. (Ukraine)
M. M. Biliy, Taras Shevchenko National Univ. (Ukraine)
Z. Z. Yanchuk, Taras Shevchenko National Univ. (Ukraine)


Published in SPIE Proceedings Vol. 5507:
XVI International Conference on Spectroscopy of Molecules and Crystals
Galyna O. Puchkovska; Tatiana A. Gavrilko; Olexandr I. Lizengevich, Editor(s)

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