Wafer-scale emission energy modulation of indium flushed quantum ots

  • Semiconductor self-assembled quantum dots (QDs) have garnered immense attention for their potential in various quantum technologies and photonics applications. Here, we explore a novel approach for fine-tuning the emission wavelength of QDs by building upon the indium flush growth method: Submonolayer variations in the capping thickness reveal a non-monotonic progression, where the emission energy can decrease even though the capping thickness decreases. indium flush, a well-known technique for inducing blue shifts in quantum dot emissions, involves the partial capping of QDs with GaAs followed by a temperature ramp-up. However, our findings reveal that the capping layer roughness, stemming from fractional monolayers during overgrowth, plays a pivotal role in modulating the emission energy of these QDs. We propose increased indium interdiffusion between the QDs and the surrounding GaAs capping layer for a rough surface surrounding the QD as the driving mechanism. This interdiffusion alters the indium content within the QDs, resulting in an additional emission energy shift, counterintuitive to the capping layer’s thickness increase. We utilize photoluminescence spectroscopy to generate wafer maps depicting the emission spectrum of the QDs. Using thickness gradients, we produce systematic variations in the capping layer thickness on 3″ wafers, resulting in modulations of the emission energy of up to 26 meV.

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Author:Nikolai SpitzerORCiDGND, Nikolai BartGND, Hans-Georg BabinGND, Marcel SchmidtORCiDGND, Andreas D. WieckORCiDGND, Arne LudwigORCiDGND
Parent Title (English):Crystals
Place of publication:Basel
Document Type:Article
Date of Publication (online):2024/03/11
Date of first Publication:2023/11/30
Publishing Institution:Ruhr-Universität Bochum, Universitätsbibliothek
Tag:Open Access Fonds
indium flush method; molecular beam epitaxy; quantum dots
Issue:12, Artikel 1657
First Page:1657-1
Last Page:1657-10
Article Processing Charge funded by the Deutsche Forschungsgemeinschaft (DFG) and the Open Access Publication Fund of Ruhr-Universität Bochum.
Institutes/Facilities:Lehrstuhl für Angewandte Festkörperphysik
Dewey Decimal Classification:Naturwissenschaften und Mathematik / Physik
open_access (DINI-Set):open_access
faculties:Fakultät für Physik und Astronomie
Licence (English):License LogoCreative Commons - CC BY 4.0 - Attribution 4.0 International