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Modeling of elastic, piezoelectric and optical properties of vertically correlated GaN/AlN quantum dots

Published online by Cambridge University Press:  01 February 2011

Sławomir P. Łepkowski ,
Grzegorz Jurczak ,
Paweł Dłużewski  and
Tadeusz Suski
Sławomir P. Łepkowski
Affiliation:
Unipress, Institute of High Pressure Physics, Polish Academy of Sciences, ul. Sokołowska 29, 01–142 Warszawa, Poland Faculty of Mathematics and Sciences, Cardinal Stefan Wyszyński University, Dewajtis 5, 01–815., Poland
Grzegorz Jurczak
Affiliation:
Institute of Fundamental Technological Research, ul. Łwiętokrzyska 21, 00–049 Warszawa, Poland
Paweł Dłużewski
Affiliation:
Unipress, Institute of High Pressure Physics, Polish Academy of Sciences, ul. Sokołowska 29, 01–142 Warszawa, Poland
Tadeusz Suski
Affiliation:
Unipress, Institute of High Pressure Physics, Polish Academy of Sciences, ul. Sokołowska 29, 01–142 Warszawa, Poland
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Abstract

We theoretically investigate elastic, piezoelectric and optical properties of wurtzite GaN/AlN quantum dots, having hexagonal pyramid-shape, stacked in a multilayer. We show that the strain existing in quantum dots and barriers depends significantly on the distance between the dots i.e. on the width of AlN barriers. For typical QDs, having the base diameter of 19.5nm, the drop of the electrostatic potential in the quantum dot region slightly decreases with decreasing of the barrier width. This decrease is however much smaller for QDs than for superlattice of GaN/AlGaN quantum wells, with thickness similar to the height of QDs. Consequently, the band-to-band transition energies in the vertically correlated GaN/AlN QDs show unexpected, rather weak dependence on the width of AlN barriers. Increasing the QD base diameter leads to stronger decreasing dependence of the band-to-band transition energies vs. the width of AlN barriers, similar to that observed for superlattieces of QWs.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 831: Symposium E – GaN, AlN, InN, and Their Alloys , 2004 , E11.14
Copyright
Copyright © Materials Research Society 2005

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References

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