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Effects of valence band tails on the blue and red spectral shifts observed in the temperature‐dependent photoluminescence of InN
Author(s) -
Seetoh Ian P.,
Soh Chew Beng,
Fitzgerald Eugene A.,
Chua Soo Jin
Publication year - 2013
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.201248552
Subject(s) - photoluminescence , blueshift , spectral line , valence (chemistry) , impurity , red shift , materials science , trimethylindium , nitrogen , analytical chemistry (journal) , band gap , valence band , chemistry , condensed matter physics , metalorganic vapour phase epitaxy , epitaxy , nanotechnology , optoelectronics , physics , organic chemistry , layer (electronics) , quantum mechanics , astronomy , chromatography , galaxy
Lineshape‐fitting, using a model that takes into account of band tails, was performed on the photoluminescence spectra measured from InN samples at temperatures varying from 5 to 300 K. By analyzing how the fitted parameters varied with temperature, it was found that the previously observed blue and then red shift of emission peak position with increasing temperature is related to valence band tails. The initial blue‐shift at low temperature is due to filling of valence band tails while the subsequent Varshni red‐shift is due to lattice expansion. In a series of samples grown using increasing trimethylindium flow rates during metal organic chemical vapor deposition, the impurity potential that describes the width of the valence band tail increased from 18 to 26 meV, possibly due to more nitrogen vacancies being created in the material.