Physics – Condensed Matter – Materials Science
Scientific paper
2002-05-07
Physics
Condensed Matter
Materials Science
11 pages, 6 figures, submitted to European Phyhysical Jouranal B
Scientific paper
Excitonic absorption, reflection and photoluminescence spectra of mixed Zn(P_{1-x}As_{x})_{2}crystals over the full range of x (0 < x < 1) and Zn_{1-x}Cd_{x}P_{2} crystals at 0 < x < 0.05 have been studied at low temperatures (1.8 K). The decrease of the energy gap in Zn(P_{1-x}As_{x})_{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 Zn_{1-x}Cd_{x}P_{2} crystals the energy gap and rydbergs decrease at the increase of x (at 0 < x < 0.05) as well. The dependences of E_{g} and Ry on x are considerably stronger in Zn(P_{1-x}As_{x})_{2} than in Zn_{1-x}Cd_{x}P_{2}. 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.
Biliy M. M.
Yanchuk Z. Z.
Yeshchenko Oleg A.
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