Effects of nanocrystal shape on the physical properties of colloidal ZnO quantum dots

The effects of both nanocrystal shape and applied magnetic field on the electron energy spectra of colloidal ZnO quantum dots have been investigated in the frame of finite element method, using nonuniform triangular elements. Four shapes of quantum dots (spherical, ellipsoidal, rod-shaped, and lens-...

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Bibliographic Details
Published in:Physica. E, Low-dimensional systems & nanostructures Low-dimensional systems & nanostructures, 2004-07, Vol.23 (3), p.410-415
Main Authors: Qu, Fanyao, Santos, D.R, Dantas, N.O, Monte, A.F.G, Morais, P.C
Format: Article
Language:English
Subjects:
Finite element method
Magnetic field effect
Nanocrystal
Quantum dot
Quantum dot shape effect
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Summary:The effects of both nanocrystal shape and applied magnetic field on the electron energy spectra of colloidal ZnO quantum dots have been investigated in the frame of finite element method, using nonuniform triangular elements. Four shapes of quantum dots (spherical, ellipsoidal, rod-shaped, and lens-shaped) were studied. It was found that the physical properties of the semiconductor quantum dots could be manipulated by changing their size and/or their shape. The energies of an electron increase as one reduces the quantum dot shape symmetry from spherical towards the lens-shaped. The magnetic field effect strongly interplays with the nanocrystal size and the nanocrystal shape effects. Such interplay has been attributed to the competition of the quantum confinement effect introduced by the barrier potential and the quantum confinement effect introduced by the applied magnetic field.
ISSN:1386-9477
1873-1759
DOI:10.1016/j.physe.2003.12.137