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Quantum-Confined Stark Effect and Polarization Field in Single Quantum Well InGaN/GaN LEDs

Published online by Cambridge University Press:  01 February 2011

Robert Kaplar ,
Steven Kurtz  and
Daniel Koleske
Robert Kaplar
Affiliation:
rjkapla@sandia.gov, Sandia National Labs, PO Box 5800, MS 0601, Albuquerque, NM, 87185, United States
Steven Kurtz
Affiliation:
srkurtz@sandia.gov, Sandia National Labs, United States
Daniel Koleske
Affiliation:
ddkoles@sandia.gov, Sandia National Labs, United States
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Abstract

Based on the wurtzite crystal structure, large (MV/cm) polarization-induced electric fields are known to exist in InGaN single quantum wells (SQWs) grown perpendicular to the GaN c-axis, and these fields may impact optical device performance due to the quantum-confined Stark effect (QCSE). In general, the QCSE has experimentally been found to be smaller than the theoretical value expected for a coherently strained InGaN QW, and subsequently the InGaN/GaN QW polarization field is often under-estimated as well. In this study, we measure the QCSE in modulation-doped, InGaN/GaN SQW LEDs. The well-behaved capacitance-voltage (majority-carrier) characteristics of these devices allow us to unambiguously determine the applied field with bias. With this analysis, we de-couple the QCSE from the QW polarization field and show that although the applied field approaches the opposing QW polarization field theoretical value (i.e., flatband), the QCSE remains too small. We propose a localized-hole picture of the InGaN QW which explains our optical and electrical measurements.

Keywords

nitrideoptical propertiesmetalorganic deposition
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 892 , 2005 , 0892-FF32-01
Copyright
Copyright © Materials Research Society 2006

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