Energy-Level Structure and Band Alignment in InP/ZnSe Core/Shell Quantum Dots Article Swipe
Dobromił Respekta
,
Pieter Schiettecatte
,
Luca Giordano
,
Norick De Vlamynck
,
Pieter Geiregat
,
Juan I. Climente
,
Zeger Hens
·
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1021/acsnano.5c02258
YOU?
·
· 2025
· Open Access
·
· DOI: https://doi.org/10.1021/acsnano.5c02258
Quantum dots (QDs) feature a sequence of discrete electron and hole energy levels that are often characterized by the envelope symmetry of the electron orbitals. Furthermore, these orbitals exhibit a specific localization in the case of core/shell QDs, extended across the entire QD or restricted to either the core or the shell, depending on the band alignment. Here, we investigate the energy-level alignment in InP/ZnSe core/shell QDs. In agreement with predictions based on k·p calculations, we show that optical transitions in these QDs follow well-defined, mutually exclusive selection rules in 1-photon and 2-photon absorption that can be related to the envelope symmetry of the orbitals involved. In addition, we argue based on a combination of the transient absorption spectrum and the k·p calculations that the lower energy transitions in InP/ZnSe QDs excite electrons from different valence band (VB) levels to the lowest conduction band level. We use this insight to align the InP- and ZnSe-based energy levels and conclude that the VB offset exceeds the natural band offset between InP and ZnSe. Applying this procedure to QDs with decreasing InP core sizes shows a progressive reduction of the offset between the core and shell VB levels. The enhanced tailing of the hole wave function into the ZnSe shell for smaller InP cores can affect the stability of such QDs.
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Metadata
- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1021/acsnano.5c02258
- OA Status
- green
- Cited By
- 3
- References
- 38
- Related Works
- 10
- OpenAlex ID
- https://openalex.org/W4410614479
All OpenAlex metadata
Raw OpenAlex JSON
- OpenAlex ID
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https://openalex.org/W4410614479Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1021/acsnano.5c02258Digital Object Identifier
- Title
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Energy-Level Structure and Band Alignment in InP/ZnSe Core/Shell Quantum DotsWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2025Year of publication
- Publication date
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2025-05-22Full publication date if available
- Authors
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Dobromił Respekta, Pieter Schiettecatte, Luca Giordano, Norick De Vlamynck, Pieter Geiregat, Juan I. Climente, Zeger HensList of authors in order
- Landing page
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https://doi.org/10.1021/acsnano.5c02258Publisher landing page
- Open access
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YesWhether a free full text is available
- OA status
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greenOpen access status per OpenAlex
- OA URL
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https://biblio.ugent.be/publication/01K7KY9JD543BMA21YS8RD5BSBDirect OA link when available
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Quantum dot, Materials science, Core (optical fiber), Shell (structure), Optoelectronics, Electronic band structure, Nanotechnology, Physics, Condensed matter physics, Composite materialTop concepts (fields/topics) attached by OpenAlex
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3Total citation count in OpenAlex
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2025: 3Per-year citation counts (last 5 years)
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10Other works algorithmically related by OpenAlex
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