Composition, surface topography, structure, Raman, and electrochemical/photoelectrochemical characterisation of CdxHg1−xTe films

Sahu, S.N.; Antonio, Marina; Sánchez, Carlos

doi:10.1016/0927-0248(95)00173-5

Cited by 11 publications

(9 citation statements)

References 21 publications

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“…It has been found that the composition of Hg and Te changes with the change in electrodeposition current density which is ascribed to the respective nobility of the cations. 11 Near stoicheometric HgTe nanocrystalline thin film could be obtained by the above-mentioned electrodeposition parameters. The thickness of the film was found to be 30 nm as estimated from RBS measurements (details to be published elsewhere).…”

Section: Resultsmentioning

confidence: 99%

QUANTUM CONFINEMENT EFFECT IN HgTe NANOCRYSTALS AND VISIBLE LUMINESCENCE

et al. 2004

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Mercury Telluride (HgTe) nanocrystals with a mean size of 5.35 nm have been synthesized by an electrochemical technique. Structural analysis by transmission electron microscopy and glancing angle X-ray diffraction studies indicate the presence of cubic phase HgTe nanocrystals in the deposit. Optical absorption measurements reveal two well resolved excitonic peaks around 578.5 nm and 550 nm attributed to heavy hole valence band (HVB)-conduction band (CB) and light hole valence band (LVB)-CB transitions, respectively, and suggest a band opening of bulk inverted narrow band gap HgTe as a result of strong quantum confinement effect (QCE). Visible photoluminescence (PL) of HgTe nanocrystals indicates free exciton transition around 579.5 nm as observed from the PL measurement at 300 K along with a bound exciton dominated band around 588 nm. Micro-Raman measurements at 300 K indicate the 1LO vibrational mode at 142.6 cm −1 shifted by 6 cm −1 from its standard bulk value and confirm the QCE.

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Section: Resultsmentioning

confidence: 99%

QUANTUM CONFINEMENT EFFECT IN HgTe NANOCRYSTALS AND VISIBLE LUMINESCENCE

et al. 2004

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“…The method described in this study is based on electrodeposition that allows for facile composition tuning of the CdTe layer. Considering that further improvement of CdTe-based photoelectrodes must be accompanied by the optimization of the Fermi level, band positions, and the conductivity of the CdTe layer, – the method described here will create more opportunities to improve the photoelectrochemical properties of CdTe-based photoelectrodes by enabling the formation of high quality three-dimensional junction structures as well as fine composition tuning.…”

Section: Discussionmentioning

confidence: 99%

Photoelectrochemical Properties of Heterojunction CdTe/TiO₂ Electrodes Constructed Using Highly Ordered TiO₂ Nanotube Arrays

et al. 2008

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A heterojunction CdTe/TiO 2 photoelectrode was prepared by electrochemically filling the tubes and tube-to-tube voids of a TiO 2 nanotube array with CdTe. The TiO 2 nanotube arrays used in this study were prepared by anodizing titanium films, which resulted in closely packed n-type TiO 2 tubes with an average inner pore diameter of 50 nm, wall thickness of approximately 13 nm, and length of 250-300 nm. CdTe was cathodically deposited using TiO 2 nanotubes as the working electrode at E ) -0.4 V vs Ag/AgCl at 85 °C (3H + + Cd 2+ + HTeO 2 + + 6ef CdTe + 2H 2 O). The resulting electrodes contained three-dimensionally organized CdTe/TiO 2 junction structures with significantly enhanced junction areas. Formation of the CdTe/TiO 2 junction improved the photocurrent generation and photostability of the CdTe layer when compared with a two-dimensional CdTe layer deposited directly on a conducting substrate (i.e., fluorine-doped tin oxide). A more intimate and conformal CdTe/TiO 2 junction was formed via a new deposition technique developed in this study that promotes deposition of CdTe only in the TiO 2 tubes while minimizing deposition at the tube entrances, thus preventing pore clogging. The CdTe/TiO 2 electrodes prepared by the new technique created a longer path length for light in the CdTe layer as well as increased CdTe/TiO 2 and CdTe/electrolyte junction areas. This resulted in enhanced photon absorption and photocurrent generation, achieved using a minimal amount of CdTe.

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“…The 1LO Raman phonon mode of bulk CdTe is at 175 cm À1 [49]. Alloying effect between HgTe and CdTe should have yielded 1LO Raman frequency in between 175 cm À1 and 140 cm À1 [50] which is not the case in the present core/shell structure. Shell related phonons were generally observed for much higher shell thickness [51,52].…”

Section: Shown Inmentioning

confidence: 79%

Epitaxial growth of colloidal hydrophilic lattice matched HgTe/CdTe core/shell nanocrystals for UV luminescence

Hussain

Sarangi

Sahu

2012

Materials Chemistry and Physics

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Composition, surface topography, structure, Raman, and electrochemical/photoelectrochemical characterisation of CdxHg1−xTe films

Cited by 11 publications

References 21 publications

QUANTUM CONFINEMENT EFFECT IN HgTe NANOCRYSTALS AND VISIBLE LUMINESCENCE

QUANTUM CONFINEMENT EFFECT IN HgTe NANOCRYSTALS AND VISIBLE LUMINESCENCE

Photoelectrochemical Properties of Heterojunction CdTe/TiO₂ Electrodes Constructed Using Highly Ordered TiO₂ Nanotube Arrays

Epitaxial growth of colloidal hydrophilic lattice matched HgTe/CdTe core/shell nanocrystals for UV luminescence

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Composition, surface topography, structure, Raman, and electrochemical/photoelectrochemical characterisation of CdxHg1−xTe films

Cited by 11 publications

References 21 publications

QUANTUM CONFINEMENT EFFECT IN HgTe NANOCRYSTALS AND VISIBLE LUMINESCENCE

QUANTUM CONFINEMENT EFFECT IN HgTe NANOCRYSTALS AND VISIBLE LUMINESCENCE

Photoelectrochemical Properties of Heterojunction CdTe/TiO2 Electrodes Constructed Using Highly Ordered TiO2 Nanotube Arrays

Epitaxial growth of colloidal hydrophilic lattice matched HgTe/CdTe core/shell nanocrystals for UV luminescence

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Photoelectrochemical Properties of Heterojunction CdTe/TiO₂ Electrodes Constructed Using Highly Ordered TiO₂ Nanotube Arrays