Synthesis of monodisperse CdS nanowires and their photovoltaic applications

Xi, Lifei; Tan, Winnie Xiu Wen; Chua, Kee Sze; Boothroyd, Chris; Lam, Yeng Ming

doi:10.1016/j.tsf.2009.02.054

Cited by 28 publications

(22 citation statements)

References 42 publications

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“…They exhibit quantum confinement effect such as size-dependent optical and electric properties for applications in optoelectronic devices [ 1 - 3 ] and biological fluorescence labeling [ 4 , 5 ]. CdS, with a bulk band gap of ~2.42 eV (~512 nm) and exciton Bohr radius of ~3 nm, is a candidate for quantum-dot blue light-emitting diodes [ 6 ] and can be used in photovoltaic devices [ 7 ]. In order to tune the optical properties of CdS quantum dots for specific applications, two schemes have been put forward.…”

Section: Introductionmentioning

confidence: 99%

Noninjection Synthesis of CdS and Alloyed CdSxSe1−x Nanocrystals Without Nucleation Initiators

Zou

Yang

2010

Nanoscale Res Lett

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CdS and alloyed CdSxSe1−x nanocrystals were prepared by a simple noninjection method without nucleation initiators. Oleic acid (OA) was used to stabilize the growth of the CdS nanocrystals. The size of the CdS nanocrystals can be tuned by changing the OA/Cd molar ratios. On the basis of the successful synthesis of CdS nanocrystals, alloyed CdSxSe1−x nanocrystals can also be prepared by simply replacing certain amount of S precursor with equal amount of Se precursor, verified by TEM, XRD, EDX as well as UV–Vis absorption analysis. The optical properties of the alloyed CdSxSe1−x nanocrystals can be tuned by adjusting the S/Se feed molar ratios. This synthetic approach developed is highly reproducible and can be readily scaled up for potential industrial production.

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Section: Introductionmentioning

confidence: 99%

Noninjection Synthesis of CdS and Alloyed CdSxSe1−x Nanocrystals Without Nucleation Initiators

Zou

Yang

2010

Nanoscale Res Lett

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“…Scope of the present paper is to highlight its photo-enhanced properties that modify the chemical activity at surface. Even though it is known that the electrical properties of CdS are influenced by visible and near infrared electromagnetic radiation, [17][18][19] the literature lacks of studies on the influence of irradiation on the adsorption properties. Irradiation influences the extent of the spacecharge layer confined at the surface of CdS nanograins, which forms upon atmospheric oxygen adsorption.…”

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confidence: 99%

Resonant photoactivation of cadmium sulfide and its effect on the surface chemical activity

Giberti

Fabbri

Gaiardo³

et al. 2014

Applied Physics Letters

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Photo-enhanced surface chemical activity of cadmium sulfide gives rise to a wide class of surface-dependent phenomena, such as heterogeneous photocatalysis, chemoresistivity and chemiluminescence, which have several technological and scientific applications. In this work, the photochemical properties of nanostructured cadmium sulfide films are investigated by means of electrical conductance measurements in controlled atmosphere, while irradiated by light of wavelengths ranging from 400 to 645 nm. Chemisorption of benzene, carbon monoxide, methane, ethanol and hydrogen sulfide onto CdS surface has been analyzed as a function of the wavelength, in a gas concentration range of the order of parts per million. It resulted that the increase of photoconductance with gas adsorption is resonant with the bandgap energy. It turns out that this resonant enhancement of the surface chemical activity can be of advantage for all the optical and chemical mechanisms that depend upon it. An interpretation of these results, in terms of electronic optical transitions and Fermi level shift induced by light, is proposed

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“…Apart from the above‐mentioned nanoribbons, the CdS nanoribbons are also attracting interest to the research community because CdS is a very promising group II–VI optoelectronic semiconductor with its band gap (

\approx

2.5 eV) appearing in the visible spectrum. This lead to possible application of CdS in light‐emitting diode, solar cell, field‐emitting devices, thin film transistors, optical wave guides, electrically driven laser systems, nonlinear optical switch . CdS may exist in various nanostructural form like nanotube, nanowire, nanoribbon, etc.…”

Section: Introductionmentioning

confidence: 99%

Properties of armchair and zigzag CdS nanoribbons: A density functional study

Das

Gupta

2015

Phys. Status Solidi B

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Using density functional theory‐based calculation, we have investigated the structural and electrical properties such as atomic structure, energetics, band gap, and work function of various armchair and zigzag CdS nanoribbons. Our study establishes that the armchair nanoribbons are more favorable compared to zigzag nanoribbons. It also reveals that both the armchair and zigzag nanoribbons become more stable upon hydrogen passivation at the edges. With regard to band gap, it is found that all the armchair nanoribbons are semiconducting in nature and their band gap decreases smoothly with increasing ribbon width. On the other hand, the lower width zigzag nanoribbons turn out to be semiconducting and they undergo a metallic transition as width increases. The effect of hydrogen passivation on band gap is also investigated. We further study work functions of all nanoribbons, which is relevant to field emission applications.

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Synthesis of monodisperse CdS nanowires and their photovoltaic applications

Cited by 28 publications

References 42 publications

Noninjection Synthesis of CdS and Alloyed CdSxSe1−x Nanocrystals Without Nucleation Initiators

Noninjection Synthesis of CdS and Alloyed CdSxSe1−x Nanocrystals Without Nucleation Initiators

Resonant photoactivation of cadmium sulfide and its effect on the surface chemical activity

Properties of armchair and zigzag CdS nanoribbons: A density functional study

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