Yazar "Oktik, Sener" için listeleme
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The analysis of the charge transport mechanism of n-Si/MEH-PPV device structure using forward bias I-V-T characteristics
Kavasoglu, A. Sertap; Yakuphanoglu, Fahrettin; Kavasoglu, Nese; Pakma, Osman; Birgi, Ozcan; Oktik, Sener (Elsevier Science Sa, 2010)In this study, temperature dependent current-voltage (I-V) measurements and investigation of the dc current transport mechanism of n-Si/MEH-PPV device have been performed. While the series resistance value displayed strongly ... -
The circuit point of view of the temperature dependent open circuit voltage decay of the solar cell
Kavasoglu, A. Sertap; Kavasoglu, Nese; Oktik, Sener (Pergamon-Elsevier Science Ltd, 2009)The open circuit voltage decay (OCVD) technique has been used to determine the minority carrier lifetime. In this study, an experimental and analytical method is described for determination of minority carrier lifetime at ... -
Induced changes of thermotropic properties of phase transitions between smectic A mesophase and isotropic liquid: Effect of surfaces
Nesrullajev, Arif; Oktik, Sener (World Scientific Publ Co Pte Ltd, 2006)In this work, the effect of thin films on the thermotropic and thermo-optical properties and peculiaxities of the phase transitions between the smectic A and isotropic liquid have been investigated. Peculiarities of the ... -
Intensity modulated short circuit current spectroscopy for solar cells
Kavasoglu, Nese; Kavasoglu, A. Sertap; Birgi, Ozcan; Oktik, Sener (Elsevier Science Bv, 2011)Understanding charge separation and transport is momentously important for the rectification of solar cell performance. To probe photo-generated carrier dynamics, we implemented intensity modulated short circuit current ... -
Negative capacitance peculiarities in a-Si:H/c-Si rectifier structure
Kavasoglu, A. Sertap; Kavasoglu, Nese; Kodolbas, A. Osman; Birgi, Ozcan; Oktu, Ozcan; Oktik, Sener (Elsevier, 2010)Nontrivial negative capacitance (NC) effect, observed in a-Si:H/c-Si heterostructure devices, is discussed emphasizing the theoretical interpretation of experimental data. To explain NC effect, we have performed dark current ... -
A new method of diode ideality factor extraction from dark I-V curve
Kavasoglu, Nese; Kavasoglu, A. Sertap; Oktik, Sener (Elsevier Science Bv, 2009)Most of the techniques have been developed to extract diode ideality factor utilize the one-exponential diode model. However, for a correct description of two linear regions in the log I-V (current-voltage) graph Of Unipolar ... -
Nonlinear thermotropic and thermo-optical behaviour of planar oriented textures in nematic liquid crystals at phase transitions
Avci, Nejmettin; Nesrullajev, Arif; Oktik, Sener (Springer, 2010)Thermotropic, thermo-morphologic and thermo-optical properties of the planar oriented nematic liquid crystals have been investigated for large temperature interval and especially for the direct nematic - isotropic liquid ... -
Photocapacitance study at p-i-n photodiode by numerical C-V integration
Kavasoglu, A. Sertap; Kavasoglu, Nese; Oktik, Sener (Pergamon-Elsevier Science Ltd, 2009)This paper describes a different numerical approach to estimate the impurity profile in a typical p-i-n device by using measured capacitance-voltage (C-V) characteristics. The constructed numerical model has been found to ... -
Room-temperature interface state analysis of Au/Poly(4-vinyl phenol)/p-Si structure
Kavasoglu, Nese; Tozlu, Cem; Pakma, Osman; Kavasoglu, A. Sertap; Ozden, Sadan; Metin, Bengul; Oktik, Sener (Elsevier Science Sa, 2009)The Poly(4-vinyl phenol) insulator layer was grown by spin coating technique onto p-Si substrate. Diode ideality factor (n), insulator layer thickness (delta), space charge region width (W(D)), interface state density ... -
Seasonal Variation of Internal Parameters of an Amorphous Silicon (a-Si) Thin Film Photovoltaic Module
Eke, Rustu; Oktik, Sener (Int Journal Renewable Energy Research, 2012)Operating parameters of a KA58 Amorphous Silicon (a-Si) photovoltaic module is investigated as a function of solar irradiation and atmospheric conditions using current-voltage curves taken for a year from April to May at ... -
Simulation for capacitance correction from Nyquist plot of complex impedance-voltage characteristics
Kavasoğlu, Abdulkadir Sertap; Kavasoğlu, Neşe; Oktik, Sener (Pergamon-Elsevier Science Ltd, 2008)The impression of series resistance on unipolar semiconductor device's capacitance-voltage spectrum is discussed by conventional impedance and admittance analysis, and it is shown that series resistance may cause large ... -
Texture transformations and orientational properties of lyotropic nematics in magnetic field
Nesrullajev, Arif; Oktik, Sener (Wiley-V C H Verlag Gmbh, 2007)Dynamics of changes of the morphological properties and processes of orientation in lyotropic nematic mesophases by application of external magnetic field have been investigated in detail. The dynamics of changes of the ... -
Thermotropic and Thermo-optical Properties of Nematic Mesophase at Direct and Reverse Phase Transitions
Avci, Nejmettin; Nesrullajev, Arif; Oktik, Sener (Springer/Plenum Publishers, 2010)Comparative investigations of the thermo-optical, thermotropic, and thermo-morphologic properties of aligned and non-aligned textures in the nematic mesophase over a large temperature interval and in regions of direct and ...
