Browsing by Author "Birel, O"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Fabrication and electrical characterization of Al/diazo compound containing polyoxy chain/p-Si device structure
    Birel, O; Kavasoglu, N; Kavasoglu, AS; Dincalp, H; Metin, B
    Diazo-compounds are important class of chemical compounds in terms of optical and electronic properties which make them potentially attractive for device applications. Diazo compound containing polyoxy chain has been deposited on p-Si. Current-voltage characteristics of Al/diazo compound containing polyoxy chain/p-Si structure present rectifying behaviour. The Schottky barrier height (SBH), diode factor (n), reverse saturation current (I-o), interface state density (N-ss) of Al/diazo compound containing polyoxy chain/p-Si structure have been calculated from experimental forward bias current-voltage data measured in the temperature range 100-320 K and capacitance-voltage data measured at room temperature and 1 MHz. The calculated values of SBH have ranged from 0.041 and 0.151 eV for the high and low temperature regions. Diode factor values fluctuate between the values 14 and 18 with temperature. Such a high diode factors stem from disordered interface layer in a junction structure as stated by Brotzmann et al. [M. Brotzmann, U. Vetter, H. Hofsass, J. Appl. Phys. 106 (2009) 063704]. The calculated values of saturation current have ranged from 3 x 10(-11) A to 2.79 x 10(-7) A and interface state density have ranged from 5 x 10(11) eV(-1) cm(-2) and 4 x 10(13) eV(-1) cm(-2) as temperature increases. Results show that Al/diazo compound containing polyoxy chain/p-Si structure is a valuable candidate for device applications in terms of low reverse saturation current and low interface state density. (C) 2012 Elsevier B.V. All rights reserved.
  • No Thumbnail Available
    Item
    Iron(III) selective fluorescence probe based on perylene tetracarboxylic diimide
    Tirtom, VN; Çelik-Erbas, S; Birel, O; Xue, CM
    Responses of organic fluorophore, perylenediimide derivative N,N'-di[3-[2-(3-thienyl)ethyl]phenyl]perylene-3,4,9,10-bis-(dicarboxyimide) (PDI1) was investigated in polymer matrix of polyvinyl chloride (PVC) by emission spectrometry. Its response to Fe(III) ions was evaluated in terms of the effect of pH. The properties of time dependent response, reversibility, limit of detection, linear concentration range for the metal ion and repeatability characteristics of the sensing element also have been studied. The offered sensor exhibited remarkable fluorescence intensity quenching at pH 6.0 in the concentration range of 1 x 10(-6) to 2.5 x 10(-3) M Fe(III) ions. The reproducibility of the sensor membrane was investigated by alternately changing the solution between 1 x 10(-4) M Fe(III) in Na2HPO4 (4 x 10(-2) M) and NaH2PO4 buffer (2 x 10(-3) M).