Comparison study of energy bands and Wannier-Mott excitons in mixed Zn(P
As
)
and Zn
Cd
P
crystals |
| |
| Authors: | OA Yeshchenko MM Biliy ZZ Yanchuk |
| |
| Institution: | (1) Physics Department, Taras Shevchenko National Kyiv University, 6 Akademik Glushkov prosp., 03127 Kyiv, Ukraine, UA |
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| Abstract: | Excitonic absorption, reflection and photoluminescence spectra of mixed Zn(P1-xAsx)2 crystals 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.
Received 13 March 2002 Published online 9 July 2002 |
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| Keywords: | PACS 71 35 -y Excitons and related phenomena – 74 62 Dh Effects of crystal defects doping aaand substitution |
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