Carrier separation in type-II quantum dots inserted in (Zn,Mg)Te/ZnSe nanowires

Quantum dots consisting of an axial Zn 0.97 Mg 0.03 Te insertion inside a large-bandgap Zn 0.9 Mg 0.1 Te nanowire core are fabricated in a molecular-beam epitaxy system by employing the vapor-liquid-solid growth mechanism. In addition, this structure is coated with a thin ZnSe radial shell that form...

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Veröffentlicht in:Nanoscale 2023-02, Vol.15 (8), p.4143-4151
Hauptverfasser: Baranowski, Piotr, Szymura, Ma gorzata, Kaleta, Anna, Kret, S awomir, Wójcik, Maciej, Georgiev, Rosen, Chusnutdinow, Sergij, Karczewski, Grzegorz, Wojtowicz, Tomasz, Tomasz Baczewski, Lech, Wojnar, Piotr
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Sprache:eng
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Zusammenfassung:Quantum dots consisting of an axial Zn 0.97 Mg 0.03 Te insertion inside a large-bandgap Zn 0.9 Mg 0.1 Te nanowire core are fabricated in a molecular-beam epitaxy system by employing the vapor-liquid-solid growth mechanism. In addition, this structure is coated with a thin ZnSe radial shell that forms a type-II interface with the dot semiconductor. The resulting radial electron-hole separation is evidenced by several distinct effects that occur in the presence of the ZnSe shell, including the optical emission redshift of about 250 meV, a significant decrease in emission intensity, an increase in the excitonic lifetime by one order of magnitude, and an increase in the biexciton binding energy. The type-II nanowire quantum dots where electrons and holes are radially separated constitute a promising platform for potential applications in the field of quantum information technology. Quantum dots consisting of an axial Zn 0.97 Mg 0.03 Te insertion inside a large-bandgap Zn 0.9 Mg 0.1 Te nanowire core coated with two radial shells: ZnSe/Zn 0.9 Mg 0.1 Te. The interface between dot and ZnSe shell is characterized by type-II band alignment.
ISSN:2040-3364
2040-3372
DOI:10.1039/d2nr05351a