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 | |
| Publication status | Published - Aug 2004 |
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ASJC Scopus subject areas
- Materials Science(all)
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Inverted core/shell nanocrystals continuously tunable between type-I and type-II localization regimes. / Balet, L. P.; Ivanov, S. A.; Piryatinski, A.; Achermann, M.; Klimov, Victor I.
In: Nano Letters, Vol. 4, No. 8, 08.2004, p. 1485-1488.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Inverted core/shell nanocrystals continuously tunable between type-I and type-II localization regimes
AU - Balet, L. P.
AU - Ivanov, S. A.
AU - Piryatinski, A.
AU - Achermann, M.
AU - Klimov, Victor I
PY - 2004/8
Y1 - 2004/8
N2 - 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.
AB - 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.
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U2 - 10.1021/nl049146c
DO - 10.1021/nl049146c
M3 - Article
VL - 4
SP - 1485
EP - 1488
JO - Nano Letters
JF - Nano Letters
SN - 1530-6984
IS - 8
ER -