Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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  • Article
    Citation - WoS: 14
    Citation - Scopus: 14
    Analysis of Illumination Dependent Electrical Characteristics of Α- Styryl Substituted Bodipy Dye-Based Hybrid Heterojunction
    (Springer, 2021) Kaplan, Nazmiye; Emrullahoğlu, Mustafa; Taşcı, Enis; Emrullahoğlu, Mustafa; Gökçe, Halil; Tuğluoğlu, Nihat; Eymur, Serkan; 04.04. Department of Photonics; 04. Faculty of Science; 01. Izmir Institute of Technology
    The alpha-styryl substituted BODIPY compound (BDP-Sty) was synthesized and characterized. The optimize ground state structure, HOMO and LUMO simulations, MEP surface map, and various molecular descriptors of the isolated BDP-Sty compound were investigated by Density Functional Theory at the B3LYP/6-311G (d,p) level. The reverse and forward bias current-voltage (I-V) characteristics of the Au/BDP-Sty/n-Si/In diode showed Schottky diode-like characteristics. An ideality factor (n) and barrier height (phi(b)) values of prepared diode for dark were found as 2.32 and 0.828, respectively. The series resistance (R-s) values were attained from the dV/dln(I) plot and Cheung's H(I) function and their values found for dark as 4.95 k omega and 4.59 k omega, respectively. The lnI - lnV and ln(I-R) - V-R(1/2) characteristics of the Au/BDP-Sty/n-Si/In diode reveal that the conduction mechanism is ohmic at low voltage and that of trap-filled space charge limited current and space charge limited current at higher voltage. The characteristic photodiode parameters of the prepared diode such as open circuit voltage (V-oc), short circuit current density (J(sc)), and photosensitivity (S) have also been investigated. All these results indicate the applicability for Au/BDP-Sty/n-Si/In diode in the field optoelectronic device applications.
  • Article
    Citation - WoS: 16
    Citation - Scopus: 16
    Investigation of Electrical and Photovoltaic Properties of Au/N-si Schottky Diode With Bod-Z Interlayer
    (Springer, 2021) Tezcan, Ali Osman; Emrullahoğlu, Mustafa; Eymur, Serkan; Taşcı, Enis; Emrullahoğlu, Mustafa; Tuğluoğlu, Nihat; 04.04. Department of Photonics; 04. Faculty of Science; 01. Izmir Institute of Technology
    4,4-Difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) based BOD-Z-EN compound was used as an interfacial organic layer to fabrication of Au/BOD-Z-EN/n-Si/In diode. The electrical parameters of Au/BOD-Z-EN/n-Si/In diode such as ideality factor (n), barrier height (phi(b)) and series resistance (R-s) have been investigated through current-voltage (I-V) studies at dark and under various illumination intensities to understand the effect of interlayer on the device properties. The values found for the n varied from 2.33 to 1.55 and the phi(b) ranged from 0.86 to 0.90 eV as the illumination condition changed from dark to 100 mW/cm(2). Series resistance (R-s) values calculated using Cheung's method were found to decrease with increasing illumination level. The forward bias I-V characteristics of the diode were explained by the space charge limited current theory. The main photovoltaic parameters such as open circuit voltage (V-oc), short circuit current density (J(sc)) and fill factor (FF) were determined for various light intensity. The Au/BOD-Z-EN/n-Si/In diode exhibits a photovoltaic behavior with a V-oc of 150 mV and J(sc) of 10 mu A/cm(2) under 100 mw/cm(2). In addition, photosensitivity and photoresponsivity properties of the diode were determined. All these results indicate that Au/BOD-Z-EN/n-Si/In device can be used as photosensor in optoelectronic applications.
  • Article
    Citation - WoS: 12
    Citation - Scopus: 12
    Modification of Metal/Semiconductor Junctions by Self-Assembled Monolayer Organic Films
    (Elsevier Ltd., 2009) Yakuphanoğlu, Fahrettin; Okur, Salih; Okur, Salih; Özgener, Hüseyin; 04.05. Department of Pyhsics; 04.01. Department of Chemistry; 04. Faculty of Science; 01. Izmir Institute of Technology
    Two new metal/molecule/semiconductor contacts, Au/n-Si/TDA/Au and Au/p-Si/ODM/Au, were fabricated to understand effect of organic compounds, tridecylamine and octadecylmercaptan self-assembled monolayer (SAM) films, on electrical charge transport properties of the metal/semiconductor junctions. The morphology of the organic monolayers deposited on Si substrates was investigated by atomic force microscopy. The molecular coverage of ODM deposited on p-Si is poorer than that of TDA on n-Si substrate. The ideality factors of the p-Si/ODM and n-Si/TDA diodes were found to be 1.66 and 1.48, respectively. The electrical results show that the tridecylamine monolayer passivated junction has a lower ideality factor. The ideality factor indicates clear dependence on two different type functional groups R-SH (Thiol) and R-NH2 (Amin) groups and it increases with different functional groups of organic molecule. The barrier height φb value of the n-Si/TDA diode is smaller than that of p-Si/ODM diode, as a result of chain length of the SAM organic molecules. The interface state density Dit values of the diodes were determined using conductance technique. The n-Si/TDA diode has the smaller interface state density according to p-Si/ODM diode. We have evaluated that the organic molecules control the electronic parameters of metal/semiconductor diodes and thus, organic modification helps to get one step closer towards to new organic assisted silicon based microelectronic devices.