Browsing by Author "Cherpak, Vladyslav"

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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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    Modeling of electric field distribution in the reflective cholesteric liquid crystal display
    (Видавництво Національного університету «Львівська політехніка», 2002) Lopatynsky, Ivan; Mikityuk, Zenovij; Cherpak, Vladyslav; Fechan, Andrew; Lviv Polytechnic National University
    Modeling the electrode structure of display devices is considered in present paper. The modeling of electric field distribution that applied in a different electrode structure in an anisotropy medium was done.Carried out modeling of electric field distribution in the proposed liquid crystal cell construction of the LC display suggested us to use such electrode structure in the reflective LC display on the base of cholesteric liquid crystals
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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.