Electroless method for Bi2Te3 film deposition

Scidone, L.; Diliberto, Sébastien; Stein, Nicolas; Boulanger, Clotilde; Lecuire, J.M.

doi:10.1016/j.matlet.2004.11.013

Cited by 12 publications

(4 citation statements)

References 7 publications

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“…[10] The interpretation of the data is not obvious, but the capacity measurements show that the Bi-rich film exhibit defects. This result agrees with the work of Scidone et al, [11] which claim that annealing of Bi-rich film is necessary in order to improve their transport properties. As the double layer capacitance cannot be neglected, the flat band potential was not determined from the MS plot.…”

Section: Mott-schottky Analysissupporting

confidence: 92%

Characterizations of bismuth telluride films from Mott‐Schottky plot and spectroscopic ellipsometry

Zimmer

Stein

Johann

et al. 2008

Surface & Interface Analysis

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Capacitance measurement results (via the so-called Mott-Schottky plot) and Infrared spectroscopic ellipsometry (IRSE) analysis have been carried out in order to study semiconducting properties of electroplated thin films of bismuth telluride (Bi 2 Te 3 ) without any electrical contact. Electrochemical impedance measurements at 10 kHz exhibited that films characterized n-type semiconductors, depending upon potentials applied above and below the flat-band potential. By IRSE study, the energy band gap E g was found to be about 0.11 eV independent of the film composition and the electrical resistivity of about 30 µ .m. By combining IRSE and capacitance measurement results, dielectric constant ε and carrier concentration of the samples were calculated without any assumptions.

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Section: Mott-schottky Analysissupporting

confidence: 92%

Characterizations of bismuth telluride films from Mott‐Schottky plot and spectroscopic ellipsometry

Zimmer

Stein

Johann

et al. 2008

Surface & Interface Analysis

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“…Concerning the Bi 2 Te 3 synthesis methods, the material was prepared successfully using techniques based on chemical reaction in solution, such as electroless deposition [ 6 ], electrochemical deposition [ 7 ], solvothermal [ 1 ], and sol–gel [ 8 ], among others. Such techniques require additional treatments to obtain a uniform and adherent thin film, free of secondary phases formed by the employed chemical precursors.…”

Section: Introductionmentioning

confidence: 99%

Bi2Te3 Thin Films Deposited by the Combination of Bi and Te Plasmas in a PLD Process

et al. 2023

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Bismuth telluride thin films were grown by pulsed laser deposition by implementing a novel method that combines both Te and Bi plasmas resulting from the laser ablation of individual Bi and Te targets. Furthermore, the mean kinetic ion energy and density of the plasmas, as estimated by TOF curves obtained from Langmuir probe measurements, were used as control parameters for the deposition process. The obtained thin films exhibit a metallic mirror-like appearance and present good adhesion to the substrate. Morphology of the thin films was observed by SEM, yielding smooth surfaces where particulates were also observed (splashing). Chemical composition analysis obtained by EDS showed that apparently the films have a Te-rich composition (ratio of Te/Bi of 3); however, Te excess arises from the splashing as revealed by the structural characterization (XRD and Raman spectroscopy). The XRD pattern indicated that depositions have the rhombohedral (D3d5(R3¯m)) structure of Bi2Te3. Likewise, Raman spectra exhibited the presence of signals that correspond to Eg2, A1u2 and A1g2(LO) vibrational modes of the same rhombohedral phase of Bi2Te3. Additionally, oxidation states, analyzed by XPS, resulted in signals associated to Bi3+ and Te2- that correspond to the Bi2Te3 compound. Finally, surface topology and thickness profiles were obtained from AFM measurements, confirming a combination of a smooth surface with particulates on top of it and a film thickness of 400 nm.

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“…To synthesize bismuth telluride, a number of techniques have been established, including the hydrothermal approach [5][6][7], thermal evaporation techniques [8][9][10][11][12], electrodeposition methods [13][14][15], solvothermal methods [16][17][18][19] and other techniques [20]; which can produce different morphologies of the samples like single crystals, nanocrystalline materials and thin films. Sol-gel synthesis of the thermoelectric bismuth telluride is rarely reported and, this work emphasizes the use of sol-gel method to produce nanopowders of Bi 2 Te 3 .…”

Section: Introductionmentioning

confidence: 99%

Ab initio investigations on the structural and optical properties of sol-gel synthesized bismuth telluride nanoparticles

K A

2023

Phys. Scr.

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Bismuth telluride nanopowders are prepared by a simple but efficient wet chemical synthesis route namely Sol-gel auto-combustion. X-ray diffraction (XRD) and Scanning Electron Microscopic (SEM) analyses were used to study the structural and morphological characteristics. The crystallinity of the produced samples were verified using XRD, and composition was confirmed by Energy Dispersive x-ray analysis (EDAX) measurements. The optical characterization of the prepared bismuth nanopowders were also carried out using Diffused Reflectance Spectroscopy (DRS) and Raman spectroscopic analysis. The optical bandgap of the prepared nanopowder is found to be 3.27 eV. Raman active modes of the sample are also reported. The optical properties of the Bismuth telluride nanopowder are rarely reported. The optical constant evaluation of the prepared sample point towards the probable application of these materials in optoelectronic devices in addition to its conventional thermoelectric applications.

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Electroless method for Bi2Te3 film deposition

Cited by 12 publications

References 7 publications

Characterizations of bismuth telluride films from Mott‐Schottky plot and spectroscopic ellipsometry

Characterizations of bismuth telluride films from Mott‐Schottky plot and spectroscopic ellipsometry

Bi2Te3 Thin Films Deposited by the Combination of Bi and Te Plasmas in a PLD Process

Ab initio investigations on the structural and optical properties of sol-gel synthesized bismuth telluride nanoparticles

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