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Mechanism for Radiative Recombination in In0.15Ga0.85N/GaN Multiple Quantum Well Structures

Published online by Cambridge University Press:  10 February 2011

B Monemar ,
J P Bergman ,
J Dalfors ,
G Pozina ,
B E Sernelius ,
P O Holtz ,
H Amano  and
I Akasaki
B Monemar
Affiliation:
Department of Physics and Measurement Technology, Linköping University, S-581 83 Linköping, Sweden
J P Bergman
Affiliation:
Department of Physics and Measurement Technology, Linköping University, S-581 83 Linköping, Sweden
J Dalfors
Affiliation:
Department of Physics and Measurement Technology, Linköping University, S-581 83 Linköping, Sweden
G Pozina
Affiliation:
Department of Physics and Measurement Technology, Linköping University, S-581 83 Linköping, Sweden
B E Sernelius
Affiliation:
Department of Physics and Measurement Technology, Linköping University, S-581 83 Linköping, Sweden
P O Holtz
Affiliation:
Department of Physics and Measurement Technology, Linköping University, S-581 83 Linköping, Sweden
H Amano
Affiliation:
Department of Electrical Engineering and Electronics, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468, Japan
I Akasaki
Affiliation:
Department of Electrical Engineering and Electronics, Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468, Japan
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Abstract

We present a study of the radiative recombination in In0.15Ga0.85N/GaN multiple quantum well samples, where the conditions of growth of the InGaN quantum layers were varied. The piezoelectric field as well as short range potential fluctuations are screened via different mechanisms by donor electrons and excited electron-hole pairs. These effects account for a large part of the spectral shift with donor doping (an upward shift of the photoluminescence (PL) peak up to 0.2 eV is observed for a Si donor density of 2 × 1018 cm-3 in the well), with excitation intensity and with delay time after pulsed excitation (also shifts up to 0.2 eV). It appears like 2-dimensional screening of short range potential fluctuations is needed to fully explain the data. We suggest that excitons as well as shallow donors are at least partly impact ionized by electrons in the rather strong lateral potential fluctuations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 537: Symposium G – GaN and Related Alloys , 1998 , G2.5
Copyright
Copyright © Materials Research Society 1999

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