Journal ArticleDOI
Electrical conductivity of air-exposed and unexposed lead telluride thin films-temperature and size effects
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TLDR
In this paper, it was found that the electrical resistivity of the air-exposed films is much higher than that of the as-grown (unexposed) thin films.Abstract:
Thin films of PbTe of different thicknesses have been prepared on glass substrates at room temperature by vacuum deposition. It is found that the electrical resistivity of the air-exposed films is much higher (by about 2 to 3 orders of magnitude) than that of the as-grown (unexposed) thin films. The electrical resistivity temperature behaviours of both the air-exposed and as-grown (unexposed) thin films of PbTe are different but both show hysteresis behaviour during successive heating-cooling cycles. These observations can be explained by considering that the desorption of absorbed gas molecules (mainly oxygen) and creation of defects at higher temperatures during heating influence the electrical conduction. Further, the time factor involved in gas desorption-adsorption can cause the observed hysteresis in temperature-dependent conduction behaviour. The as-grown (unexposed) thin-film conductivity exhibits the expected reciprocal thickness dependence due to the thickness effect, but the air-exposed film conductivity does not. This can be explained to be due to the complete masking of the thickness effect by the gas adsorption effect in air-exposed film conductivity. The reciprocal thickness dependence observed in the case of unexposed film conductivity has been explained by the 'effective mean free path' model. The low value of the 'grain boundary' mean free path obtained by the analysis points to the fact that in polycrystalline films, grain boundary scattering is extensive and controls the film conductivity.read more
Citations
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Synthesis and characterization of copper doped zinc telluride thin films
TL;DR: In this article, copper doped zinc telluride (ZnTe:Cu) thin films have been synthesized by an electrodeposition technique from acidic aqueous bath containing ZnSO 4, TeO 2 and CuSO 4.
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Structural and electrical properties of thermally evaporated cobalt phthalocyanine (CoPc) thin films
TL;DR: In this article, the mean free path of charge carriers in CoPc thin films and bulk resistivity was estimated using the CBH model with centers of intimate valence alternation pairs type with a maximum barrier height of 1.594 eV.
Journal ArticleDOI
Controlling the crystallite size and influence of the film thickness on the optical and electrical characteristics of nanocrystalline Cu2S films
TL;DR: In this paper, the surface morphology of the deposited Cu 2 S nanocrystalline films was studied using both the scanning electron microscopy (SEM) and the atomic force microscopy(AFM).
Journal ArticleDOI
Enhancement of thermoelectric power of PbTe thin films by Ag ion implantation
Manju Bala,Anuradha Bhogra,Saif A. Khan,T. S. Tripathi,Surya Kant Tripathi,D.K. Avasthi,K. Asokan +6 more
TL;DR: In this paper, an enhancement in the thermoelectric power (TEP) of thermally evaporated PbTe thin films by low energy Ag ion implantation was reported.
Journal ArticleDOI
Enhancement of thermoelectric power of PbTe:Ag nanocomposite thin films
Manju Bala,Srashti Gupta,T. S. Tripathi,Shikha Varma,Surya Kant Tripathi,K. Asokan,D.K. Avasthi +6 more
TL;DR: In this article, the enhancement of thermoelectric power of PbTe:Ag nanocomposite thin films, synthesized by the thermal evaporation technique, was investigated.
References
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Journal ArticleDOI
Mobility of Electrons and Holes in PbS, PbSe, and PbTe between Room Temperature and 4.2°K
TL;DR: Hall coefficient and resistivity measurements have been made on 29 single crystals (mostly synthetic) of PbS, PbSe, and PbTe between room temperature and 4.2\ifmmode^\circ\else\textdegree\fi{}K as mentioned in this paper.
Journal ArticleDOI
A theoretical description of grain boundary electron scattering by an effective mean free path
TL;DR: A mathematical analysis based on the Mayadas-Shatzkes model indicates that an effective mean free path may be defined in order to describe electronic conduction in both thin polycrystalline and monocrystalline metallic films as discussed by the authors.
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Recent advances in the optical and electronic properties of PbS, PbSe, PbTe and their alloys
Journal ArticleDOI
Optical Constants of Lead Sulfide in the Fundamental Absorption Edge Region
R. B. Schoolar,Jack R. Dixon +1 more
Journal ArticleDOI
Interpretation of the Hall coefficient, electrical resistivity and Seebeck coefficient of p-type lead telluride
A J Crocker,L M Rogers +1 more
TL;DR: In this article, the Hall coefficient and electrical resistivity have been measured from 77 to 450°K for the carrier concentration range 4.3 × 1017 to 1.6 × 1020 cm-3.