Sulfur Vacancy Mechanism in Pure CdS

Vuylsteke, Arthur A.; Sihvonen, Y. T.

doi:10.1103/physrev.113.40

Cited by 60 publications

(23 citation statements)

References 6 publications

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“…These photo-generated trapped electrons recombine with holes in the valence band, leading to an emission at 670 nm. Based on this PL data, the sulfur vacancy is located nearly ~0.7 eV below the conduction band in the CdS nanorods, which is comparable with the values reported for bulk CdS [25,26]. Deposition of Au nanocrystals on S 2 rich CdS severely quenched the PL intensity from the CdS nanorods (Fig.…”

Section: Photoluminescence and Charge Separationsupporting

confidence: 77%

Growth of Au nanocrystals on CdS nanorods

Yang

2006

Met. Mater. Int.

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Nanorods of S2 rich CdS were synthesized by a reaction of excess S versus Cd precursors in the presence of ethylene diamine. The photoluminescence (PL) emission from the S 2 rich CdS nanorods was broad with a peak at ~710 nm, which was 40 nm longer in wavelength than the PL peak from Cd 2+ rich CdS (~670 nm) nanorods. The influence of surface electron or hole trap states on the luminescent pathway of CdS nanorods will be discussed to explain these shifts in wavelength. Nanocrystals of Au ~2 nm in size were grown on S 2 rich surfaces of CdS nanorods. Significant luminescence quenching was observed from the Au nanocrystals on the CdS nanorods due to interfacial charge separation. Charge separation by the Au nanocrystals on the CdS resulted in enhanced photocatalytic degradation of Procion red mix-5B (PRB) dye in an aqueous solution under UV light irradiation.

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Section: Photoluminescence and Charge Separationsupporting

confidence: 77%

Growth of Au nanocrystals on CdS nanorods

Yang

2006

Met. Mater. Int.

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“…The spectra show two main features-a bandedge luminescence peak at 2.44 eV with FWHM of 0.11 eV, and a broad sub-bandgap emission from 1.65 to 2.18 eV. The sub-bandgap emission is attributed to S vacancies, [32] which is a common feature of CdS, including high quality single crystal material. The oscillatory substructure observed within the broad sub-bandgap region is associated with thin film optical effects.…”

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confidence: 98%

Continuous Flow Supercritical Chemical Fluid Deposition of Optoelectronic Quality CdS

Yang¹,

Hyde²,

Wilson³

et al. 2009

Advanced Materials

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“…This feature is also present in most PL spectra from CdS QDs previously reported [11,12,[16][17][18]. It could be associated to midgap surface states generally attributed to sulphur vacancies [17,[19][20][21]. Compared to near band edge emission, the intensity of this PL band is weaker for samples obtained by the MW synthetic route than for those grown by single source precursor methodology.…”

Section: Resultsmentioning

confidence: 77%

Size and quality control of fast grown CdS quantum dots

Frégnaux

Dalmasso²,

Gaumet

et al. 2012

Phys. Status Solidi C

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The synthesis of high quality II‐VI semiconductor quantum dots (QDs) is fundamental for developing new devices in several applications such as biomarkers, solar cells or blue‐UV lasers. These emerging technologies are funded on the size‐dependent optical properties of the QDs. Consequently, it is a crucial aspect to get insight into different ways for syntheses of their nanosized particles. In this work, we use two different QD elaboration methods: (i) a single source precursor thermal growth methodology and (ii) a microwave synthetic route. Using both protocols, high quality small QDs (Ø < 5 nm) are produced. Both growing techniques offer the advantage to be simple and fast: 2 hours (i) and less than 25 minutes (ii) in duration, growth temperatures do not exceed 280 °C. For both elaboration procedures, we report a unique physics/chemistry cross‐disciplinary study on these small size QDs: mass spectrometry (MS) technique provides background data about composition, size and stability of particles; crystalline structure and size distribution of the QDs are obtained from X‐ray diffraction (XRD) and transmission electron microscopy (TEM); room temperature (RT) optical spectrometry of nanodispersions – photoluminescence (PL) and absorption – reveals quantum size effects. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Sulfur Vacancy Mechanism in Pure CdS

Cited by 60 publications

References 6 publications

Growth of Au nanocrystals on CdS nanorods

Growth of Au nanocrystals on CdS nanorods

Continuous Flow Supercritical Chemical Fluid Deposition of Optoelectronic Quality CdS

Size and quality control of fast grown CdS quantum dots

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