Theory of excitons in colloidal semiconductor nanoplatelets
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Date
2024-11-15
Publication Type
Journal Article
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yes
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Abstract
Semiconductor nanoplatelets - the colloidal analog of quantum wells - exhibit excitonic transitions highly sensitive to their thickness and surface treatment. Here, we present a general theory that describes the underlying physical processes. In particular, we include a less-intuitive effect: how out-of-plane quantum confinement impacts in-plane effective masses. We combine first-principles calculations with models based on k·p theory and the envelope function approximation to show how thickness and surface treatments (ligands or shells) influence excitonic properties. Our results reproduce experiments and provide intuition and quantitative insights on nanoplatelet behavior.
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published
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Journal / series
Volume
110 (19)
Pages / Article No.
195433
Publisher
American Physical Society
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Subject
Excitons; Nanocrystals; Nanoparticles; Quantum wells; Two-dimensional electron systsem; Density functional theory; k dot p method
Organisational unit
03875 - Norris, David J. / Norris, David J.
Notes
Funding
188593 - Towards Monodisperse Colloidal Semiconductor Nanocrystals (SNF)