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Linear and nonlinear optical properties of ZnO/ZnS and ZnS/ZnO core shell quantum dots: Effects of shell thickness, impurity, and dielectric environment
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10.1063/1.4813094
/content/aip/journal/jap/114/2/10.1063/1.4813094
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/2/10.1063/1.4813094
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic representations (left panel) and conduction band profiles (right panel) of the ZnO/ZnS CSQD (a) and ZnS/ZnO ICSQD (b) with inner radius and outer radius , embedded in a dielectric matrix. Two impurity positions, 1 (core-center impurity) and 2 (shell-center impurity), considered in our calculations, have been explicitly shown.

Image of FIG. 2.
FIG. 2.

Linear (red), third order nonlinear (navy), and total (blue) absorption coefficients (left panel) and refractive index changes (right panel) as a function of the photon energy for various shell (ZnS) thickness (T =  , in unit of ML) values in impurity free ZnO/ZnS CSQDs without ( , dashed dotted lines) and with ( , solid lines) dielectric environment. Here, the inner radius R = 1.5 nm and 1 ML = 0.3117 nm (for ZnS).

Image of FIG. 3.
FIG. 3.

Probability of finding the electron of ground-state (red triangles) and first excited state (blue diamonds) in the shell region as a function of the shell thickness (in unit of ML) in ZnO/ZnS CSQDs (left panel) and ZnS/ZnO ICSQDs (right panel) without ( , dashed dotted lines) and with dielectric environment ( , solid lines). For the left panel, 1 ML = 0.3117 nm (WZ ZnS), while for the right panel, 1 ML = 0.26025 nm (WZ ZnO).

Image of FIG. 4.
FIG. 4.

Linear (red), third order nonlinear (navy), and total (blue) absorption coefficients (upper panel) and refractive index changes (lower panel) as a function of the photon energy for various dopant positions in doped ZnO/ZnS CSQDs without (dashed dotted lines) and with (solid lines) dielectric environment. Here, the dopants located at the core center ( ) and at the shell center ( ) are considered. The inner radius  = 1.5 nm and the shell thickness is ).

Image of FIG. 5.
FIG. 5.

Linear absorption coefficient ( , upper panel) and refractive index change ( , lower panel) as a function of the photon energy for various shell thickness values (in unit of ML) in ZnO/ZnS CSQD without (dashed dotted lines) and with (solid lines) dielectric environment, using the conduction band discontinuity parameter .

Image of FIG. 6.
FIG. 6.

The same as in Fig. 2 but for ZnS/ZnO ICSQDs. Here, 1 ML = 0. 26025 nm (for ZnO (shell material)).

Image of FIG. 7.
FIG. 7.

The same as in Fig. 5 but for ZnS/ZnO ICSQDs.

Image of FIG. 8.
FIG. 8.

The same as in Fig. 4 but for ZnS/ZnO ICSQDs. The inner radius  = 1.5 nm and the shell thickness is ).

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/content/aip/journal/jap/114/2/10.1063/1.4813094
2013-07-11
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Linear and nonlinear optical properties of ZnO/ZnS and ZnS/ZnO core shell quantum dots: Effects of shell thickness, impurity, and dielectric environment
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/2/10.1063/1.4813094
10.1063/1.4813094
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