title: Penternary chalcogenides nanocrystals as catalytic materials for efficient counter electrodes in dye-synthesized solar cells.
abstract: The penternary chalcogenides Cu2CoSn(SeS)4 and Cu2ZnSn(SeS)4 were successfully synthesized by hot-injection method, and employed as a catalytic materials for efficient counter electrodes in dye-synthesized solar cells (DSSCs). The structural, compositional, morphological and optical properties of these pentenary semiconductors were characterized by X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), energy-dispersive spectrometer (EDS) and ultraviolet-visible (UV-Vis) spectroscopy. The Cu2CoSn(SeS)4 and Cu2ZnSn(SeS)4 nanocrystals had a single crystalline, kesterite phase, adequate stoichiometric ratio, 18-25 nm particle sizes which are forming nanospheres, and band gap energy of 1.18 and 1.45 eV, respectively. Furthermore, the electrochemical impedance spectroscopy and cyclic voltammograms indicated that Cu2CoSn(SeS)4 nanocrystals as counter electrodes exhibited better electrocatalytic activity for the reduction of iodine/iodide electrolyte than that of Cu2ZnSn(SeS)4 nanocrystals and conventional platinum (Pt). The photovoltaic results demonstrated that DSSC with a Cu2CoSn(SeS)4 nanocrystals-based counter electrode achieved the best efficiency of 6.47%, which is higher than the same photoanode employing a Cu2ZnSn(SeS)4 nanocrystals (3.18%) and Pt (5.41%) counter electrodes. These promising results highlight the potential application of penternary chalcogen Cu2CoSn(SeS)4 nanocrystals in low-cost, high-efficiency, Pt-free DSSCs.
authors.affiliation: Department of Metallurgical and Materials Engineering, Faculty of Engineering, Karamanoğlu Mehmetbey University, 70200, Karaman, Turkey.
authors.forename: Faruk
authors.initials: F
authors.lastname: Özel
authors.affiliation: Department of Metallurgical and Materials Engineering, Faculty of Engineering, Karamanoğlu Mehmetbey University, 70200, Karaman, Turkey.
authors.forename: Adem
authors.initials: A
authors.lastname: Sarılmaz
authors.affiliation: Selcuk University, Advanced Technology Research and Application Center, 42030, Konya, Turkey.
authors.forename: Bilal
authors.initials: B
authors.lastname: İstanbullu
authors.affiliation: Selcuk University, Advanced Technology Research and Application Center, 42030, Konya, Turkey.
authors.forename: Abdalaziz
authors.initials: A
authors.lastname: Aljabour
authors.affiliation: Selcuk University, Advanced Technology Research and Application Center, 42030, Konya, Turkey.
authors.forename: Mahmut
authors.initials: M
authors.lastname: Kuş
authors.affiliation: Department of Metallurgical and Materials Engineering, Faculty of Engineering, Karamanoğlu Mehmetbey University, 70200, Karaman, Turkey.|Nanotechnology R&D Laboratory, Karamanoğlu Mehmetbey University, 70200, Karaman, Turkey.
authors.forename: Savaş
authors.initials: S
authors.lastname: Sönmezoğlu