Single GaN/AlGaN Quantum Dot Spectroscopy

• Authors: K. Surowiecka , A. Wysmołek , R. Stępniewski , R. Bożek , K. Pakuła , J. Baranowski
• Languages of publication: EN

Abstracts

EN

Microphotoluminescence of low-density GaN/Al_{x}Ga_{1-x}N quantum dots grown by metal-organic vapor phase epitaxy using in situ etching of AlGaN is presented. The detailed analysis of the emission from these structures enables the observation of pairs of lines separated by the energy up to 3 meV. They behave in a different way under different excitation power that suggests that this doublet structure can be associated with the exciton and trion (or biexciton recombination). It is observed that for different quantum dots the energy of the charged exciton complex emission could be higher or lower than the neutral exciton one. It is discussed in terms of a competition between attractive e-h and repulsive e-e (h-h) Coulomb interaction that occurs because of the existence of the built-in electric field that separates electrons and holes in the dot.

Keywords

EN

78.55.Cr; 78.67.Hc

Discipline

• 78.55.Cr: III-V semiconductors
• 78.67.Hc: Quantum dots

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2007
• Volume: 112
• Issue: 2
• Pages: 233-236

Dates

published

2007-08

received

2007-06-09

Contributors

author

K. Surowiecka

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

A. Wysmołek

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

R. Stępniewski

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

R. Bożek

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

K. Pakuła

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

author

J. Baranowski

• Institute of Experimental Physics, Warsaw University, Hoża 69, 00-681 Warsaw, Poland

References

• 1. K. Tachibana, T. Someya, Y. Arakawa, Appl. Phys. Lett., 74, 383, 1999
• 2. B. Chwalisz, A. Wysmolek, R. Bozek, R. Stepniewski, K. Pakua, P. Kossacki, A. Golnik, J.M. Baranowski, Acta Phys. Pol. A, 105, 517, 2004
• 3. K. Pakua, R. Bozek, K. Surowiecka, R. Stepniewski, A. Wysmolek, J.M. Baranowski, J. Crystal Growth, 289, 472, 2006
• 4. K. Pakula, R. Bozek, J.M. Baranowski, J. Jasinski, Z. Liliental-Weber, J. Crystal Growth, 267, 1, 2004
• 5. N. Grandjean, B. Damilano, S. Dalmasso, M. Leroux, M. Laeught, J. Massies, J. Appl. Phys., 86, 3714, 1999

Identifiers

DOI

10.12693/APhysPolA.112.233