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Spontaneous polarization field in polar and nonpolar GaInN/GaN quantum well structures
Author(s) -
Thomsen M.,
Jönen H.,
Rossow U.,
Hangleiter A.
Publication year - 2011
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.201046337
Subject(s) - cathodoluminescence , quantum well , polar , blueshift , polarization (electrochemistry) , materials science , condensed matter physics , emission intensity , wide bandgap semiconductor , atomic physics , chemistry , optoelectronics , optics , physics , luminescence , photoluminescence , laser , astronomy
We present a UHV cathodoluminescence study of the spontaneous polarization field in polar [0001] and nonpolar $[1{\bar {1}}00]$ GaN/GaInN single quantum well structures. Employing electron‐stimulated desorption a descreening of the spontaneous field in the polar c ‐plane samples was observed, which counteracts the piezoelectric field in the quantum well. While in c ‐plane samples a strong blueshift of the emission energy takes place and a drastic increase of emission intensity occurs, no change of the QW emission energy and intensity from m ‐plane samples was detected. The different behaviour under the same experimental conditions can only be explained with the absence of the spontaneous polarization field in the nonpolar $[1{\bar {1}}00]$ m ‐direction.