WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7150

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2011 - 20162

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Author: search.filters.author.Demiç, ŞerafettinInstitution Author: search.filters.institutionAuthor.Aydın, Hasan

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  • Article
    Citation - WoS: 1
    Investigation of the Electrical Parameters of the Organic Diode Modified With 4-[(3 Benzoic Acid
    (Electrochemical Society, Inc., 2016) Havare, A. Kemal; Okur, Salih; Can, Mustafa; Yağmurcukardeş, Nesli; Yiğit, Mesude Zeliha; Aydın, Hasan; Okur, Salih; Demiç, Şerafettin; İçli, Sıddık; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    4-[(3-Methylphenyl)(phenyl)amino]benzoic acid (MPPBA) self-assembled monolayer (SAM) molecules as hole injection is formed on p and n type Si and on indium-tin oxide (ITO) electrodes to investigate the effect on the electrical parameters of hole only organic device. The hole mobility improvement of organic device was attributed to an intermediate energy level formed between hole transport materials (HTL) (N,N'-Bis(naphthalen-1-yl)-N,N'-bis(phenyl)benzidine -NPB) and ITO when forming an ultrathin MPPBA layer, leading to increase of carrier mobility of the device. Space charge limited current (SCLC) technique is used to estimate the mobility of the NPB formed at the interface metal/organic Ohmic contact. The hole mobility of ITO/NPB/Al and ITO/MPPBA/NPB/Al devices were obtained as 1.80 x 10(-6) and 1.76 x 10(-3) cm(2)/Vs, at 1350 E (V/cm)(1/2) applied electric field, respectively. SAM modified devices has lower barrier height values. The electronic characteristic parameters of the ITO/(with or without MPPBA)/NPB/Al, Au/n-Si(or p-Si)/(with or without MPPBA)/Au contacts were calculated using current-voltage (I-V) measurements by Schottky type carrier injection. (C) The Author(s) 2016. Published by ECS.
  • Article
    Citation - WoS: 35
    Citation - Scopus: 37
    Modification of Ito Surface Using Aromatic Small Molecules With Carboxylic Acid Groups for Oled Applications
    (Elsevier Ltd., 2011) Havare, Ali Kemal; Tarı, Süleyman; Demiç, Şerafettin; Okur, Salih; Kuş, Mahmut; Okur, Salih; Yağmurcukardeş, Nesli; Tarı, Süleyman; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    4-[(3-Methylphenyl)(phenyl)amino]benzoic acid (MPPBA) was synthesized in order to facilitate the hole-injection in Organic Light Emitting Diodes (OLED). MPPBA was applied to form self-assembled monolayer (SAM) on indium tin oxide (ITO) anode to align energy-level at the interface between organic semiconductor material (TPD) and inorganic anode (ITO) in OLED devices. The modified surface was characterized by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM). KPFM was used to measure the surface potential and work function between the tip and the ITO surface modified by SAM technique using MPPBA. The OLED devices (ITO/MPPBA/TPD/Alq3/Al) fabricated with SAM-modified ITO substrates showed lower turn-on voltages and enhanced diode current compare to the OLED devices fabricated with bare ITO substrates.