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Recombination radiation and electroreflection of excitons in Zn x Cd 1− x Se solid solutions
Author(s) -
Mashchenko V. E.,
Ziborov A. I.
Publication year - 1986
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221350221
Subject(s) - exciton , annihilation , absorption edge , spectral line , atomic physics , excitation , biexciton , line (geometry) , absorption spectroscopy , absorption (acoustics) , phonon , emission spectrum , photoluminescence , chemistry , molecular physics , physics , condensed matter physics , band gap , optics , quantum mechanics , geometry , mathematics
The simultaneous investigation of electroreflection (ER) and secondary radiation (SR) spectra of Zn x Cd 1− x Se solid solutions under off‐resonance (resonance) laser excitation at 5 to 300 K reveals the fine structure of the fundamental absorption edge which arises from the direct and indirect creation and annihilation of excitons of series Γ 6 –Γ 8 or Γ 7 –Γ 9 und Γ 7 –Γ 7 . The shape of the SR exciton line at low temperatures is determined by the exciton trapping processes at random potential fluctuations of composition. This statistic random potential manifests itself in a blue shift of the SR exciton line with the N 2 ‐laser excitation. The behaviour of the SR exciton line at 77 K is strongly governed by the exciton annihilation processes with the simultaneous emission or absorption of LO phonons. A possible effect of extended and self‐trapped exciton states in SR spectra at high temperature is considered.