Makale Koleksiyonu

Permanent URI for this collection

http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/1037

Browse

collection.page.browse.recent.head

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Optoelectronic performance comparison of new thiophene linked benzimidazole conjugates with diverse substitution patterns
    (Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2018) Murat Saltan, Gözde; Dinçalp, Haluk; Kırmacı, Eser; Kıran, Merve; Zafer, Ceylan; Dinçalp, Haluk; Murat Saltan, Gözde; Fakülteler > Mühendislik Ve Doğa Bilimleri Fakültesi > Kimya Bölümü
    In an approach to develop efficient organic optoelectronic devices to be used in light-driven systems, a series of three thiophene linked benzimidazole conjugates were synthesized and characterized. The combination of two thiophene rings to a benzimidazole core decorated with different functional groups (such as \\OCH3, \\N(CH3)2,\\CF3) resulted in donor-acceptor type molecular scaffold. The effect of the electronic behavior of the substituents on the optical, electrochemical, morphological and electron/hole transporting properties of the dyes were systematically investigated. DTBI2 dye exhibited distinct absorption properties among the other studied dyes because N,N-dimethylamino group initiated intramolecular charge transfer (ICT) process in the studied solvents. In solid state, the dyes exhibit peaks extending up to 600 nm. Depending on the solvent polar ities, dyes show significant wavelength changes on their fluorescence emission spectra in the excited states. Mor phological parameters of the thin films spin-coated from CHCl3 solution were investigated by using AFM instrument; furthermore photovoltaic responses are reported, even though photovoltaic performances of thefabricated solar cells with different configurations are quite low.
  • No Thumbnail Available
    Item
    Improvement of intramolecular charge transfer within a donor–acceptor blend by doping novel synthesized benzothiadiazole small molecules in solid state
    (Optical Materials, 2014) Dinçalp, Haluk; Murat, Gözde; İçli, Sıddık; Dinçalp, Haluk; Murat, Gözde; Fakülteler > Mühendislik Ve Doğa Bilimleri Fakültesi > Kimya Bölümü
    Three electron-deficient small molecules based on 2,1,3-benzothiadiazole (BTD) units namely, 4,7-bis (3-methoxyphenyl)-2,1,3-benzothiadiazole (BT1), (3-{7-[3-(dimethylamino)phenyl]-2,1,3-benzothiadi azole-4-yl}phenyl)dimethylamine (BT2) and 3,30 -(2,1,3-benzothiadiazole-4,7-dyl)dianiline (BT3) were synthesized and their photophysical properties were investigated systematically to understand their potential usage in ternary organic solar cells (OSCs) as additive material to enhance the cell efficiency. All these molecules show broad absorption bands in 350–750 nm on glass substrate and their optical band gaps were calculated to be around 2.50–2.80 eV. BTD fluorescence dynamics were measured in polymer:BT1:fullerene blends with varying emission wavelengths of active layer. Fluorescence emission and time resolved measurements indicated photoinduced energy shift from BT1 dye to fullerene and also from polymer to BT1 dye upon excitation of the active layer.