Abstract
Self-assembled ZnSe quantum dots (QDs) embedded in ZnS were grown by metal-organic chemical vapour deposition and investigated with atomic-force microscopy (AFM) and photoluminescence (PL) measurements. Lens-shaped ZnSe QDs with the height of 1–2.4 nm and the radius of 25–37 nm are observed through the AFM measurements. The size and areal density of QDs increases as ZnSe deposition is increased. PL spectra of ZnSe QDs show consistent blueshifts due to quantum confinement effects. A simple model taking into account the lens shape of ZnSe QDs is introduced to calculate the quantum confinement effects in ZnSe QDs. Obtained excitonic ground state transition energies are in good agreement with the experimental PL peaks, which proposes that the model is adequate to describe the quantum confinement effect in lens-shaped ZnSe QDs. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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