Stacked GaAs quantum dots fabricated by refilling of self-organized nanoholes: optical properties and post-growth annealing |
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Authors: | Polojärvi Ville Schramm Andreas Guina Mircea Stemmann Andrea Heyn Christian |
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Affiliation: | Optoelectronics Research Centre, Tampere University of Technology, FIN-33101 Tampere, Finland. |
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Abstract: | We study the photoluminescence and impact of post-growth annealing of stacked, strain-free GaAs quantum dots fabricated by refilling of self-organized nanoholes using molecular beam epitaxy. Temperature- and power-dependent photoluminescence studies reveal an excellent optical quality of the quantum-dot stack. After high-temperature post-growth annealing only slight blueshifts and an increase in full width at half-maximum of the photoluminescence peak are observed, indicating very high-temperature stability and crystalline quality of the stacked GaAs quantum-dot structure. |
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