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Ordering in GaInP 2 studied by optical spectroscopy
Author(s) -
Ernst P.,
Geng C.,
Scholz F.,
Schweizer H.
Publication year - 1996
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.2221930123
Subject(s) - photoluminescence , photoluminescence excitation , spectroscopy , luminescence , materials science , excitation , polarization (electrochemistry) , valence (chemistry) , absorption spectroscopy , exciton , molecular physics , condensed matter physics , optoelectronics , chemistry , optics , physics , organic chemistry , quantum mechanics
The optical properties of spontaneously ordered GaInP 2 grown by MOVPE are studied by means of photoluminescence, time‐resolved photoluminescence, and polarization dependent photoluminescence excitation spectroscopy. Ordered samples grown on a substrate which is misoriented 6° toward [111] B show clear excitonic features both in luminescence and absorption. In excitation spectra both valence band edges are clearly resolved and are shown to be polarization dependent as predicted by band structure calculations. In these samples an additional non‐excitonic low‐energy photoluminescence emission is observed the peak energy of which depends strongly on excitation density and temperature and which shows extremely long luminescence lifetimes. A density of states model for ordered GaInP 2 is proposed which allows to explain the results obtained in the last few years. The density of states model is discussed with respect to the microstructure of the ordered alloy as known from TEM investigations.