Piezoelectric properties of zinc blende quantum dots

S. Schulz*, M. A. Caro, E. P. O'Reilly, O. Marquardt

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

Piezoelectric coefficients of zinc blende (ZB) InN, GaN, and AlN have been estimated from the piezoelectric coefficients of the wurtzite (WZ) system. This procedure is based on a rotation of the first-order piezoelectric tensor of a (001)-oriented ZB structure to a (111)-oriented ZB structure, which is similar to a WZ structure. The derived expressions for the piezoelectric coefficients in a (111)-oriented ZB system are benchmarked against literature coefficients of different WZ materials, showing a very good agreement. To perform the desired opposite operation, a least square fitting procedure was used to find the ZB piezoelectric coefficient e 14 that provides the closest reverse transformation to the known WZ constants. Using e 14, the piezoelectric potential in a GaN/AlN QD is calculated and compared to a InAs/GaAs QD, revealing a much larger potential in the nitride system, even though the lattice mismatch is much smaller in this system. The result is related to the large piezoelectric coefficient e 14 in ZB nitride materials.

Original languageEnglish
Pages (from-to)521-525
Number of pages5
JournalPHYSICA STATUS SOLIDI B: BASIC SOLID STATE PHYSICS
Volume249
Issue number3
DOIs
Publication statusPublished - Mar 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • Built-in fields
  • Nitrides
  • Piezoelectric coefficients
  • Quantum dots
  • Zinc blende

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