Yazar "Yeşil, Tamer" seçeneğine göre listele

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  • Küçük Resim Yok
    Öğe
    Enhanced Hole Mobility of p-Type Materials by Molecular Engineering for Efficient Perovskite Solar Cells
    (Amer Chemical Soc, 2023) Yeşil, Tamer; Mutlu, Adem; Gultekin, Sirin Siyahjani; Gunel, Zeynep Gulay; Zafer, Ceylan
    Star-shaped triazatruxenederivative hole-transporting materials(HTMs), namely, 3,8,13-tris(4-(8a,9a-dihydro-9H-carbazol-9-yl)phenyl)-5,10,15-trihexyl-10,15-dihydro-5H-diindolo[3,2-a:3 & PRIME;,2 & PRIME;-c]carbazole (TAT-TY1)and 3,8,13-tris(4-(8a,9a-dihydro-9H-carbazol-9-yl)phenyl)-5,10,15-trihexyl-10,15-dihydro-5H-diindolo[3,2-a:3 & PRIME;,2 & PRIME;-c]carbazole (TAT-TY2),containing electron-rich triazatruxene cores and donor carbazole moieties,were synthesized and successfully used in triple-cation perovskitesolar cells. All the HTMs were obtained from relatively inexpensiveprecursor materials using well-known synthesis procedures and uncomplicatedpurification steps. All the HTMs, including the 5,10,15-trihexyl-10,15-dihydro-5H-diindolo[3,2-a:3',2'-c]carbazole(TAT-H) main core, had suitable highest occupied molecular orbitals(HOMOs) for perovskite (TAT-H: -5.15 eV, TAT-TY1: -5.17eV, and TAT-TY2: -5.2 eV). Steady-state and time-resolved photoluminescenceresults revealed that hole transport from the valence band of theperovskite into the HOMO of the new triazatruxene derivatives wasmore efficient than with TAT-H. Furthermore, the substitution of n-hexylcarbazole and 9-phenylcarbazole in triazatruxenealtered the crystalline nature of the main core, resulting in a smoothand pinhole-free thin-film morphology. As a result, the hole mobilitiesof TAT-TY1 and TAT-TY2 were measured to be one order of magnitudehigher than that of TAT-H. Finally, TAT-TY1 and TAT-TY2 achieved powerconversion efficiencies of up to 17.5 and 16.3%, respectively, comparedto the reference Spiro-OMeTAD. These results demonstrate that thenew star-shaped triazatruxene derivative HTMs can be synthesized withoutusing complicated synthesis strategies by controlling the intrinsicmorphology of the TAT-H main core.
  • Küçük Resim
    Öğe
    Investigation of chemical constituents of rhododendron luteum leaves
    (Ege Üniversitesi, Fen Bilimleri Enstitüsü, 2018) Yeşil, Tamer; Akgül, Yurdanur
    In this work, purification and isolation of major compounds from Rhododendron luteum's leaves by spectroscopic techniques was aimed. Dried and powdered leaves were respectively extracted with %80 ethanol, water and chloroform. Extracts were controlled on TLC. Isolation and purification studies were carried out. Five (5) major compounds were isolated after chromatographic studies. Their moleculer structures were identified as D-Fructose, D-Xylose, D-Mannitol, Avicularin and Isoquercetin by using spectroscopic techniques (1H-NMR, 13C-NMR, HSQC, HMBC, COSY) and literature data. These compounds isolated for the first time from Rhododendron luteum plant.