• P S Nikam

      Articles written in Pramana – Journal of Physics

    • Electrical properties of simultaneously evaporated Sb-Te thin films

      P S Nikam R R Pawar

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      Thin films of Sb-Te of varying compositions have been deposited on glass substrates following the three temperature method. The dc conductivity (σ), Hall coefficient (RH) and thermoelectric power (α) of annealed samples have been measured in the temperature range 300–470°K. Films exhibit metallic as well as semiconducting characteristics withp-type conductivity. The properties are found to be dependent on composition and thickness of the film.

    • Photoconductivity and dark conductivity studies of solution-gas interface grown Ag2S films

      P S Nikam C B Shinde

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      Ag2S films of thicknesses ranging between 500–4000 Å were formed on glass substrate, employing solution-gas interface technique. Dark conductivity of Ag2S films has been studied at different temperatures and Bi(III) concentrations. Photoconductivity of these films has been investigated at different temperatures, illumination levels, excitation energies and Bi(III) concentrations. Dark conductivity is explained on Slater and Neugebauer models, while photoconductivity is explained on Miccoci and Rose models.

    • Electric and dielectric properties of solution-gas interface grown amorphous AgCl films

      P S Nikam K A Pathan

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      Electric and dielectric properties of solution-gas interface grown AgCl thin film capacitors (Al/AgCl/Al) of various thicknesses have been studied in the frequency range 101–106 Hz at various temperatures (303–393 K). I–V characteristics show ohmic, space-charge-limited, and thermionic emission conduction mechanisms to operate at low, intermediate and high voltages respectively. Capacitance decreases with increasing film thickness and applied frequency while it increases with increase of temperature. Loss factor (tanδ), which shows a pronounced minimum with frequency, increases with the rise of temperature and (tanδ)min shifts to a higher frequency. The large values of capacitance and dielectric constant (ɛ) in the low frequency region indicate the possibility of an interfacial polarization mechanism to operate in this region while electronic and ionic polarizations dominate in the high frequency region.

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