Yazar "Sariciftci, Niyazi Serdar" seçeneğine göre listele

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    Enhancing the c-TiO2 based perovskite solar cell performance via modification by a serial of boronic acid derivative self-assembled monolayers
    (ELSEVIER, 2017) Kirbiyik, Cisem; Kara, Koray; Kara, Duygu Akin; Yigit, Mesude Zeliha; Istanbullu, Bilal; Can, Mustafa; Sariciftci, Niyazi Serdar
    Morphological control of MAPbI(3) crystal growth is one of the most important factor to fabricate high efficient perovskite solar cells. Herein, different boronic acid derivative self-assemble monolayers were used for modification of c-TiO2 surface and controlling of interface properties between c-TiO2 and MAPbI(3) layers. Pre-mixed MAPbI(3) solution in GBL was deposited by spin-coating technique onto non-modified and modified c-TiO2 surfaces by selected SAMs. The 1-OMe modified c-TiO2 based solar cell shows an increase in J(sc), resulting an increase to 9.4% PCE to compare with 5.9% PCE of non-modified c-TiO2 based solar cell. With this work, we demonstrated the possibility of morphological control of perovskite layer by using simple modification method of sublayer to increase the photovoltaic characteristics of solar cells. (C) 2017 Elsevier B.V. All rights reserved.
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    Nanofibrous cobalt oxide for electrocatalysis of CO2 reduction to carbon monoxide and formate in an acetonitrile-water electrolyte solution
    (ELSEVIER SCIENCE BV, 2018) Aljabour, Abdalaziz; Coskun, Halime; Apaydin, Dogukan Hazar; Ozel, Faruk; Hassel, Achim Walter; Stadler, Philipp; Sariciftci, Niyazi Serdar
    The electrocatalytic reduction of carbon dioxide (CO2) is an attractive option to efficiently bind electrical energy from renewable resources in artificial carbon fuels and feedstocks. The strategy is considered as crucial part in closing the anthropogenic carbon cycle. In particular, the electrosynthetic production of Cl species such as carbon monoxide (CO) would radiate immense power, since these building blocks offer a versatile chemistry to higher carbon products and fuels. In the present study we report the exploration of the catalytic behavior of semiconducting Co3O4 nanofibers for the conversion of CO2 to CO predominantly with a Faradaic efficiency of 65%. We assist the process by expanding the electrode network with nanofibrous interconnections and hence are able to demonstrate the electrosynthesis of CO without applying any metal supplement. We use polyacrylnitrile (PAN) as template polymer to generate highly crystalline Co3O4 fibers to expand the catalytically active surface to volume ratio. The stability of the nanofibrous electrodes remains for 8 h at a geometric current density of approximately 0.5 mA/cm(2) on a flat surface. The ease of synthesis and the comparatively high Faradaic yield for CO makes Co3O4 nanofibers a potential candidate for future large scale electrode utilization.
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    White organic light emitting diodes based on fluorene-carbazole dendrimers
    (ELSEVIER SCIENCE BV, 2014) Usluer, Ozlem; Demic, Serafettin; Kus, Mahmut; Ozel, Faruk; Sariciftci, Niyazi Serdar
    In this paper, we report on the Prod. Type: FTP fabrication and characterization of blue and white light emitting devices based on two fluorene-carbazole containing dendrimers and para-sexiphenyl (6P) oligomers. Blue light emitting diodes were fabricated using 9',9 ''-(9,9-dioctyl-9H-fluorene-2,7-diyl)bis-9' H-9,3':6',9 ''-tercarbazole (OFC-G2) and 9',9 ''-(9,9'-spirobi[fluorene]-2,7-diyl)bis-9'H-9,3':6',9 ''-tercarbazole (SBFC-G2) dendrimers as a hole transport and emissive layer (EML) and 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) as an electron transport layer. White light emitting diodes were fabricated using 6P and these two dendrimers as an EML OLED device with the structure of ITO/PEDOT:PSS (50 nm)/OFC-G2 (40 nm)/6P (20 nm)/LiF:Al (0.5:100 nm) shows maximum luminance of nearly 1400 cd/m(2) and a Commission Internationale de l'Eclairage chromaticity coordinates of (0.27, 0.30) at 12 V. (C) 2013 Elsevier B.V. All rights reserved.