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    A comparative study on TiO2 doped hybrid solar cells
    (Elsevier Science Bv, 2012) Ozdal, Teoman; Hames, Yakup; Aslan, Erdem
    In this study, n-type titanium (IV) oxide (TiO2) and p-type poly (3-hexylthiophene-2,5-diyl) (P3HT) structured various photovoltaic (PV) devices have been produced onto indium tin oxide (ITO) coated glass substrates. For the economy and simplicity, spin coating and doctor blading deposition methods were used in normal atmospheric conditions. The effect of the device morphology on the efficiency of the solar cells was investigated by applying various morphologies such as classic and optimized p-n junctions, bulk heterojunction (BHJ) and sandwich structures, respectively. Electrical characterizations of the devices were obtained under AM 1.5 G (100 mW/cm(2)) solar illumination. (c) 2012 Elsevier B.V. All rights reserved.
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    Electrochemically grown ZnO nanorods for hybrid solar cell applications
    (Pergamon-Elsevier Science Ltd, 2010) Hames, Yakup; Alpaslan, Zuehal; Koesemen, Arif; San, Sait Eren; Yerli, Yusuf
    A hybrid solar cell is designed and proposed as a feasible and reasonable alternative, according to acquired efficiency with the employment of zinc oxide (ZnO) nanorods and ZnO thin films at the same time. Both of these ZnO structures were grown electrochemically and poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester; (P3HT:PCBM) was used as an active polymer blend, which was found to be compatible to prepared indium-tin-oxide (ITO) substrate base. This ITO base was introduced with mentioned ZnO structure in such a way that, the most efficient configuration was optimized to be ITO/ZnO film/ZnO nanorod/P3HT: PCBM/Ag. Efficiency of this optimized device is found to be 2.44%. All ZnO works were carried out electrochemically, that is indeed for the first time and at relatively lower temperatures. (C) 2009 Elsevier Ltd. All rights reserved.
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    Investigation of Thickness Effects on the TM-Wave Radiation from a Thick Impedance-Loaded Parallel-Plate Radiator
    (Taylor & Francis Inc, 2011) Hames, Yakup
    In this work, the influence of the plate thickness on the lowest order TM-wave radiation is investigated by using the mode-matching method in conjunction with the Fourier transform technique. While the classical formulation leads to an intractable matrix Wiener-Hopf factorization, the hybrid method adopted here reduces the related boundary value problem to a scalar modified Wiener-Hopf equation of the second kind. The solution involves infinitely many unknown constants satisfying an infinite system of linear algebraic equations susceptible to a numerical treatment. Some computational results illustrating the effect of the plate thickness and the plate impedances on the radiation phenomenon are revealed.