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Supercapacity of Soft-Expanded Graphite in Li-Intercalational Electric Current Generation

100%
Shvets R., Grygorchak I., Kurepa A., Pokladok N., Sementsov Y., Dovbeshko G., Sheregii Y., Seredyuk B.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2
208-209
EN
A microwave-intercalation modification of natural graphite which ensures its effective use as a cathode material of Li-based sources of electric current is developed. Interconnection between the parameters of modification and thermodynamic and kinetic behavior of Li-intercalation electric current generation is established. On the basis of the obtained data from impedance spectroscopy, X-ray diffractometry analysis, and spectroscopy of the Raman scattering of light, the mechanism of the observed phenomena is suggested.
2
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Optical and Electrical Properties of Highly Doped ZnO:Al Films Deposited by Atomic Layer Deposition on Si Substrates in Visible and Near Infrared Region

81%
Romanyuk V., Dmitruk N., Karpyna V., Lashkarev G., Popovych V., Dranchuk M., Pietruszka R., Godlewski M., Dovbeshko G., Timofeeva I., Kondratenko O., Taborska, M., Ievtushenko A.
Acta Physica Polonica A
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2016
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vol. 129
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issue 1a
A-36-A-40
EN
Optical properties of ZnO films doped by Al in the range 0.5 to 7 at.% and deposited by atomic layer deposition were studied in visible and infrared spectral range. Spectral dependences of film optical permittivity were modeled with the Lorentz-Drude approximation resulting in ZnO:Al plasma frequency and plasma damping parameters. We observed changing electron effective mass from 0.29m₀ to 0.5m₀ with increasing electron concentration in the range (0.9-4) × 10²⁰ due to the phenomenon of conduction band non-parabolicity. Comparing the results of optical and electrical investigations we can see that the main scattering mechanism is the scattering on grain boundaries (its contribution is about 60%).
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