2006
DOI: 10.1021/nl060993k
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Structural Basis for Near Unity Quantum Yield Core/Shell Nanostructures

Abstract: Aberration-corrected Z-contrast scanning transmission electron microscopy of core/shell nanocrystals shows clear correlations between structure and quantum efficiency. Uniform shell coverage is obtained only for a graded CdS/ZnS shell material and is found to be critical to achieving near 100% quantum yield. The sublattice sensitivity of the images confirms that preferential growth takes place on the anion-terminated surfaces. This explains the three-dimensional "nanobullet" shape observed in the case of core/… Show more

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Cited by 222 publications
(255 citation statements)
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“…Only isolated ZnS islands could be grown on the surface of CdSe cores. 56 For this reason, we decided to investigate shell materials that can adopt a cubic, zinc blende structure with a similar lattice parameter to that of cubic, diamond Ge. Several IIÀVI and IIIÀV semiconductors are available for this purpose (Table 1).…”
Section: Resultsmentioning
confidence: 99%
“…Only isolated ZnS islands could be grown on the surface of CdSe cores. 56 For this reason, we decided to investigate shell materials that can adopt a cubic, zinc blende structure with a similar lattice parameter to that of cubic, diamond Ge. Several IIÀVI and IIIÀV semiconductors are available for this purpose (Table 1).…”
Section: Resultsmentioning
confidence: 99%
“…The growth of the CdSe tips leads to a new absorption feature near 585 nm and the corresponding PL from CdSe band edge. The double-peaked PL spectrum of CdS/CdSe nanorod heterostructures arises from a bimodal size distribution of CdSe presumably owing to the differentiation of growth rates on the two ends of the seed CdS nanorod 30,40,41 (see Supplementary Fig. 4).…”
Section: Challenges In Synthesismentioning
confidence: 99%
“…However, large red shifts by as much as 130 nm have been observed upon capping CdTe QDs with a semiconductor shell 205 and, therefore, it is unclear whether the position of the absorption peak can be used to determine the cross section reliably. Further, these QDs are highly anisotropic and exhibit a characteristic bullet shape, 206 which complicates the direct determination of the QD diameter based on simple empirical formulas.…”
Section: Absorption Cross Section Of Qdsmentioning
confidence: 99%