Colloidal synthesis and characterization of CdSe/CdTe core/shell nanowire heterostructures

Liu, Sheng; Zhang, Wenhua; Li, Can

doi:10.1016/j.jcrysgro.2011.09.045

Cited by 21 publications

(14 citation statements)

References 42 publications

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“…Interfacial misfit strain accumulates along the long dimension in core–shell QBs and nanowires, which may be partially relaxed by surface (shell-thickness) modulations. , However, shell breakage or islanding occurs when such modulations are extreme. Consequently, the shells deposited on nanowires are frequently roughened, cracked, and nonepitaxial. ,, …”

Section: Discussionmentioning

confidence: 99%

Cadmium Bis(phenyldithiocarbamate) as a Nanocrystal Shell-Growth Precursor

et al. 2017

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Cadmium bis(phenyldithiocarbamate) [Cd(PTC)] is prepared and structurally characterized. The compound crystallizes in the monoclinic space group P2/n. A one-dimensional polymeric structure is adopted in the solid state, having bridging PTC ligands and 6-coordinate pseudo-octahedral Cd atoms. The compound is soluble in DMSO, THF, and DMF and insoluble in EtOH, MeOH, CHCl, CHCl, and toluene. {CdSe[n-octylamine]} quantum belts and Cd(PTC) react to deposit epitaxial CdS shells on the nanocrystals. With an excess of Cd(PTC), the resulting thick shells contain spiny CdS nodules grown in the Stranski-Krastanov mode. Stoichiometric control affords smooth, monolayer CdS shells. A base-catalyzed reaction pathway is elucidated for the conversion of Cd(PTC) to CdS, which includes phenylisothiocyanate and aniline as intermediates, and 1,3-diphenylthiourea as a final product.

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Section: Discussionmentioning

confidence: 99%

Cadmium Bis(phenyldithiocarbamate) as a Nanocrystal Shell-Growth Precursor

et al. 2017

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“…17 Generally, photovoltaic and photocatalytic applications require directional charge separation which could not be realized in the case of core-shell QDs. Therefore type-II HNCs with heterojunctions in 1D (quantum rods) or 0D (quantum dots) NCs like CdSe-CdTe nanorods and nanowires, [18][19][20][21] CdSe-CdTe nanobarbells 22,23 and CdSe-CdTe tetrapods 24,25 gained considerable attention.…”

Section: Introductionmentioning

confidence: 99%

Colloidal synthesis and optical properties of type-II CdSe–CdTe and inverted CdTe–CdSe core–wing heteronanoplatelets

et al. 2015

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We developed colloidal synthesis to investigate the structural and electronic properties of CdSe-CdTe and inverted CdTe-CdSe heteronanoplatelets and experimentally demonstrate that the overgrowth of cadmium selenide or cadmium telluride core nanoplatelets with counterpartner chalcogenide wings leads to type-II heteronanoplatelets with emission energies defined by the bandgaps of the CdSe and CdTe platelets and the characteristic band offsets. The observed conduction and valence band offsets of 0.36 eV and 0.56 eV are in line with theoretical predictions. The presented type-II heteronanoplatelets exhibit efficient spatially indirect radiative exciton recombination with a quantum yield as high as 23%.While the exciton lifetime is strongly prolonged in the investigated type-II 2D systems with respect to 2D type-I systems, the occurring 2D giant oscillator strength (GOST) effect still leads to a fast and efficient exciton recombination. This makes type-II heteronanoplatelets interesting candidates for low threshold lasing applications and photovoltaics.

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“…The sign reversal for the effective mass of the first Γ 7 -like subband remains similar to III-V NWs. [37,38]. Because the first conduction band involves states derived from the anti-bonding p orbitals, the present EBOM theory is not suitable for describing their conduction band properties.…”

Section: Resultsmentioning

confidence: 94%

“…Nanostructures formed from combinations of these nanostructures are also abundant. They are often combined with ZnTe and CdS to form core-shell nanowires [36,37]. Their band gaps at 300 K are 1.44 eV and 2.69 eV respectively [16], which cover the visible range of the solar spectrum.…”

Section: Resultsmentioning

confidence: 99%