Energy bands and Wannier-Mott excitons in Zn(P1-xAsx)2 and Zn1-xCdxP2 crystals

O. A. Yeshchenko; M. M. Biliy; Z. Z. Yanchuk

doi:10.1117/12.570025

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20 July 2004 Energy bands and Wannier-Mott excitons in Zn(P_1-xAs_x)₂ and Zn_1-xCd_xP₂ crystals

O. A. Yeshchenko, M. M. Biliy, Z. Z. Yanchuk

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Proceedings Volume 5507, XVI International Conference on Spectroscopy of Molecules and Crystals; (2004) https://doi.org/10.1117/12.570025
Event: XVI International Conference on Spectroscopy of Molecules and Crystals, 2003, Sevastopol, Ukraine

Abstract

Excitonic absorption, reflection and photoluminescence spectra of mixed Zn(P_1-χAs_χ)₂ crystals over the full range of χ (0 ≤ χ 1) and Zn_1-χCd_χP₂ crystals at 0 ≤ χ ≤ 0.05 have been studied at low temperatures (1.8 K). The decrease of the energy gap in Zn(P_1-χAs_χ)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(P_1-χAs_χ)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(P_1-χAs_χ)₂ than in Zn_1-χCd_χP₂. 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.

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O. A. Yeshchenko, M. M. Biliy, and Z. Z. Yanchuk "Energy bands and Wannier-Mott excitons in Zn(P_1-xAs_x)₂ and Zn_1-xCd_xP₂ crystals", Proc. SPIE 5507, XVI International Conference on Spectroscopy of Molecules and Crystals, (20 July 2004); https://doi.org/10.1117/12.570025

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