Dielectric properties of vacuum deposited Bi2Te3 thin films

Dheepa, J.; Ramakrishnan, S.; Subbarayan, A.; Velumani, S.; Sebastian, P.J.; Pérez, R. Castanedo

doi:10.1016/j.solmat.2004.02.052

Cited by 22 publications

(13 citation statements)

References 23 publications

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“…As film thickness increases, the strain and dislocation density decreases progressively. This may be due to the movement of interstitial atoms from its grain boundary to the crystallites, which may be leading to reduction in the concentration of lattice imperfections [12]. Fig.…”

Section: Structural Analysismentioning

confidence: 99%

Thickness dependent structural and optical properties of In/Te bilayer thin films

Matheswaran¹,

Gokul²,

Abhirami³

et al. 2012

Materials Science in Semiconductor Processing

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Section: Structural Analysismentioning

confidence: 99%

Thickness dependent structural and optical properties of In/Te bilayer thin films

Matheswaran¹,

Gokul²,

Abhirami³

et al. 2012

Materials Science in Semiconductor Processing

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“…6 are summarized in Table II. The frequency behavior of ESs comprised of GHEs with varying NaCl concentrations was studied by complex power equations. EIS data for ESs are analyzed in the light of information available in the literature 51,57,58 to evaluate the relaxation time constant ͑ o ͒ that corresponds to a phase angle of +45°and represents a transition for ES from a resistive behavior for frequencies higher than 1/ o to a capacitive behavior for frequencies lower than 1/ o . These plots allow overarching the entire frequency spectrum for the ESs, ranging from a pure resistance at high frequencies to a pure capacitance at low frequencies.…”

Section: A76mentioning

confidence: 99%

Gelatin Hydrogel Electrolytes and Their Application to Electrochemical Supercapacitors

Choudhury¹,

Sampath

Shukla

2008

J. Electrochem. Soc.

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Gelatin hydrogel electrolytes ͑GHEs͒ with varying NaCl concentrations have been prepared by cross-linking an aqueous solution of gelatin with aqueous glutaraldehyde and characterized by scanning electron microscopy, differential scanning calorimetry, cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic chronopotentiometry. Glass transition temperatures for GHEs range between 339.6 and 376.9 K depending on the dopant concentration. Ionic conductivity behavior of GHEs was studied with varying concentrations of gelatin, glutaraldehyde, and NaCl, and found to vary between 10 −3 and 10 −1 S cm −1 . GHEs have a potential window of about 1 V. Undoped and 0.25 N NaCl-doped GHEs follow Arrhenius equations with activation energy values of 1.94 and 1.88 ϫ 10 −4 eV, respectively. Electrochemical supercapacitors ͑ESs͒ employing these GHEs in conjunction with Black Pearl Carbon electrodes are assembled and studied. Optimal values for capacitance, phase angle, and relaxation time constant of 81 F g −1 , 75°, and 0.03 s are obtained for 3 N NaCl-doped GHE, respectively. ES with pristine GHE exhibits a cycle life of 4.3 h vs 4.7 h for the ES with 3 N NaCl-doped GHE. Polymer electrolytes are widely studied materials with applications in electrochemical devices. Although the ionic conductivity behavior of solid polymer electrolytes, such as polyethylene oxidesalt complexes, was reported as early as in 1973 by Wright, the potential of these materials as a new class of solid electrolytes for energy storage applications was envisaged by Armand in 1978. [1][2][3][4] Solid polymer electrolytes exhibit ionic conductivity between 10 −8 and 10 −7 S cm −1 that is too low to be significant for devices. Accordingly, efforts have been expended to enhance the ionic conductivity of polymer electrolytes.1,2 One such approach involves addition of plasticizer, a low-molecular-weight polar solvent, such as ethylene carbonate, to a polymer-salt system to realize polymer gel electrolyte ͑PGE͒.5-8 These PGEs are solid, have good adhesive properties, and exhibit high ionic conductivity of about 10 −3 S cm −1 at ambient temperatures. Although such nonaqueous PGEs have a wider potential window of about 4 V as compared to about 1 V for their aqueous counterpart, preparation and handling of the former require a moisture-free environment that is both involved and costintensive. Besides, organic solvents used as plasticizers with nonaqueous PGEs are environmentally toxic. 5Electrochemical supercapacitors ͑ESs͒ are electrochemical power systems with highly reversible charge-storage and delivery capabilities. ESs have properties complementary to secondary batteries and find usage in hybrid energy systems for electric vehicles, heavy-load starting assist for diesel locomotives, utility load leveling, and military and medical applications.9,10 Depending on the charge-storage mechanism, an ES is classified as an electrical double-layer capacitor ͑EDLC͒ or a pseudocapacitor. Higher energy density of EDLCs, as compared to dielectric capacit...

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“…Preparation of these chalcogenide thermoelectric materials in thin film form is highly required to fabricate an active micro-cooling device in chip level. Bismuth telluride thin films have been elaborated by a variety of deposition techniques, such as evaporation [5][6][7][8], pulsed laser deposition [9,10], sputtering [11], and electrochemical deposition [12]. Even though high quality epitaxial films could be obtained by metal organic chemical vapor deposition (MOCVD) [13,14] and molecular beam epitaxy (MBE) [15,16], preparation of thermoelectric films by more conventional deposition technique is highly requested in related industry.…”

Section: Introductionmentioning

confidence: 99%

Effect of deposition temperature on the structural and thermoelectric properties of bismuth telluride thin films grown by co-sputtering

et al. 2006

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Dielectric properties of vacuum deposited Bi2Te3 thin films

Cited by 22 publications

References 23 publications

Thickness dependent structural and optical properties of In/Te bilayer thin films

Thickness dependent structural and optical properties of In/Te bilayer thin films

Gelatin Hydrogel Electrolytes and Their Application to Electrochemical Supercapacitors

Effect of deposition temperature on the structural and thermoelectric properties of bismuth telluride thin films grown by co-sputtering

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