Journal
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volume 78, Issue -, Pages 105-114Publisher
ELSEVIER
DOI: 10.1016/j.physe.2015.08.025
Keywords
Ultra-thin quantum Wells; ZnTe/CdTe/ZnTe; Photoluminescence energies; Binding energies of excitons
Funding
- DIMA-Universidad Nacional de Colombia-Manizales
- Fondo Nacional de Financiamiento para la Ciencia, la Tecnologia y la Innovacion, Fondo Francisco Jose de Caldas (COLCIENCIAS) [FP44842-395-2015]
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Using the variational method and the effective mass and parabolic band approximations, electron and heavy-hole ground-state energies and exciton and photoluminescence energies are calculated in ultrathin quantum wells of CdTe/ZnTe heterostructures. The results indicate dependencies on the well width, the barrier height, and stress-related effects and occur because the wave functions of both free carriers and those bound in exciton form determine the system energy and are shaped by the geometry of the well. Critical system thicknesses were estimated for the point at which stress effects become negligible: a value of five monolayers was obtained based on the exciton binding energy, and a value of seven monolayers was obtained based on the free-carrier ground-state energy. (C) 2015 Elsevier B.V. All rights reserved.
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