Energy bands and Wannier-Mott excitons in Zn(P₁₋ₓAsₓ)₂ and Zn₁₋ₓCdₓP₂ crystals
Yeshchenko, O. A. · Biliy, M. M. · Yanchuk, Z. Z.
Original · EN
Excitonic absorption, reflection and photoluminescence spectra of mixed Zn(P₁₋ₓAsₓ)₂crystals over the full range of x (0 < x < 1) and Zn₁₋ₓCdₓP₂ crystals at 0 < x < 0.05 have been studied at low temperatures (1.8 K). The decrease of the energy gap in Zn(P₁₋ₓAsₓ)₂ at the increase of x occurs slightly sublinearly. The rydbergs of excitonic series in this crystals decrease as well, and the dependences Ry(x) for all series are strongly superlinear at small x. In Zn₁₋ₓCdₓP₂ crystals the energy gap and rydbergs decrease at the increase of x (at 0 < x < 0.05) as well. The dependences of Eg and Ry on x are considerably stronger in Zn(P₁₋ₓAsₓ)₂ than in Zn₁₋ₓCdₓP₂. At the increase of x 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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