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CdZnS quantum dots formed by the Langmuir–Blodgett technique
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10.1116/1.4810782
/content/avs/journal/jvstb/31/4/10.1116/1.4810782
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/31/4/10.1116/1.4810782
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Figures

Image of FIG. 1.
FIG. 1.

Typical HREM plan-view images of CdZn S QDs (a) embedded in the organic matrix, (b) annealed at 200 °C and (c) annealed at 350 °C. HREM images of CdZn S QDs (d) and (e) annealed at 200 °C and (f) annealed at 350 °C.

Image of FIG. 2.
FIG. 2.

(Color online) Histograms of the QD size distribution for samples CdZn S QDs with a nominal Zn content (a) x = 0.3, (b) x = 0.5, (c) and x = 0.8 embedded in an organic matrix; (d) x = 0.3, (e) x = 0.5, and (f) x = 0.8 annealed at 200 °C; and (g) x = 0.5 (h) and x = 0.2 annealed at 350 °C. The distribution of the QD size dispersion is fitted with Gaussian curves, from which we obtain the average QD size and the size distribution.

Image of FIG. 3.
FIG. 3.

(Color online) (a) STEM HAADF image, chemical maps of (b) Zn, (c) Cd and (d) S, and (e) the integrated EDX drift-corrected spectrum of CdZn S QDs annealed at 200 °C.

Image of FIG. 4.
FIG. 4.

(Color online) UV–vis absorption spectra of CdZnS QDs with different nominal compositions (a) embedded in an organic matrix, (b), annealed at 200 °C, and (c) annealed at 350 °C.

Image of FIG. 5.
FIG. 5.

(Color online) Raman spectra of CdZnS QDs (a) annealed at 200 °C and (b) annealed at 350 °C, measured with a 325 nm excitation source.

Image of FIG. 6.
FIG. 6.

(Color online) Dependence of the experimentally determined CdZnS QD composition as a function of the nominal Zn content. Open and solid symbols are the data obtained from UV–vis absorption and Raman experiments, respectively. Circles, squares, and triangles correspond to CdZnS QDs embedded in the matrix, annealed at 200 °C, and annealed at 350 °C, respectively. Dashed lines present results based on calculations within the LS theory.

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/content/avs/journal/jvstb/31/4/10.1116/1.4810782
2013-06-11
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: CdZnS quantum dots formed by the Langmuir–Blodgett technique
http://aip.metastore.ingenta.com/content/avs/journal/jvstb/31/4/10.1116/1.4810782
10.1116/1.4810782
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