Browsing by Author "Stakhira, Pavlo"

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    Dynamics of modulation spectrums of piezophotoconductivity of monopolar semiconductor
    (Видавництво Національного університету «Львівська політехніка», 2002) Stakhira, Pavlo; Stakhira, Roman; Rzeszów University of Technology; Lviv Polytechnic National University
    Piezophotoconductivity is being analyzed - phenomenon stimulated by common action of light from spectrum region that corresponds to interband absorption and strain. The case of interband optical absorption of the system that is under the influence of adiabatic low frequency disturbance, caused by pressure, and high frequency disturbance, caused by light action, is considered. It is shown that absorption factor of a system, which is under an action of combined disturbance, is a periodic time function with the period determined by low frequency disturbance. The equation of dynamics of nonequilibrium current carriers' concentration in the conditions of acoustic-light excitation was obtained. The peculiarities of dynamics of spectrum of interband absorption of the strained semiconductor were considered.
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    Investigation of photoluminescence and electrical properties of 3,6-di(9-carbazolyl)-9-(2-ethylhexyl)carbazole
    (Видавництво Львівської політехніки, 2012) Hotra, Zenon; Stakhira, Pavlo; Volyniuk, Dmytro; Cherpak, Vladyslav; Simokaitiene, Jurate; Tomkeviciene, Ausra; Grazulevicius, Juozas; Kremer, Iryna
    In this paper the photoluminescence of organic semiconductor 3,6-di(9- carbazolyl)-9-(2-ethylhexyl) (TCz1) film and electrical properties of the device on it base are investigated. In the photoluminescence spectrum of TCz1 films at excitation of 320 and 350 nm the new red shifted band appeared which was not observed with the excitation wavelength of 270 nm. An analysis of frequency dependences of the impedance showed that the device ITO/CuI/TCz1/Al can be simulated by an equivalent circuit consisting of two series RC elements representing the organic film bulk and space charge region.
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    The influence of oxygen doping of channel of organic field-effect transistor based on nickel phthalocyanine on the output parameters
    (Видавництво Львівської політехніки, 2010) Stakhira, Pavlo; Cherpak, Vladyslav; Pakhomov, Georgiy; Volynyuk, Dmytro; Dutchak, Zoya; Hladun, Mykhaylo
    The influence of nickel phthalocyanine (NiPc) thin film doping by oxygen on electric parameters of organic transistor structures of Si/SiO2/NiPc/Au was investigated. The complex analysis of structure and electrical&physical characteristics of thin films of organic low-molecular semiconductor after influence of oxygen during seven days was carried out.