Inverted core/shell nanocrystals continuously tunable between type-I and type-II localization regimes

L. P. Balet; S. A. Ivanov; A. Piryatinski; M. Achermann; V. I. Klimov

doi:10.1021/nl049146c

Inverted core/shell nanocrystals continuously tunable between type-I and type-II localization regimes

L. P. Balet, S. A. Ivanov, A. Piryatinski, M. Achermann, V. I. Klimov

Los Alamos National Laboratory

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207 Citations (Scopus)

Abstract

We study inverted core/shell nanocrystals (NCs) in which a core of a wide gap semiconductor (ZnSe) is overcoated with a shell of a semiconductor of a narrower gap (CdSe). By monitoring radiative recombination lifetimes for a series of these NCs with a fixed core radius and progressively increasing shell thickness, we observe a continuous transition from Type-I (both electron and hole wave functions are distributed over the entire NC) to Type-II (electron and hole are spatially separated between the shell and the core) and back to Type-I (both electron and hole primarily reside in the shell) localization regimes. These observations are in good agreement with the calculated dependence of the electron-hole overlap integral on shell thickness.

Original language	English
Pages (from-to)	1485-1488
Number of pages	4
Journal	Nano letters
Volume	4
Issue number	8
DOIs	https://doi.org/10.1021/nl049146c
Publication status	Published - Aug 1 2004

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ASJC Scopus subject areas

Bioengineering
Chemistry(all)
Materials Science(all)
Condensed Matter Physics
Mechanical Engineering

Cite this

Balet, L. P., Ivanov, S. A., Piryatinski, A., Achermann, M., & Klimov, V. I. (2004). Inverted core/shell nanocrystals continuously tunable between type-I and type-II localization regimes. Nano letters, 4(8), 1485-1488. https://doi.org/10.1021/nl049146c

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10.1021/nl049146c