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Öğe Effects of solvent and copper-doping on polyaniline conducting polymer and its application as a counter electrode for efficient and cost-effective dye-sensitized solar cells(Elsevier Science Sa, 2016) Tas, Recep; Gulen, Mahir; Can, Muzaffer; Sonmezoglu, SavasIn this study, the synthesis of Copper-doped polyaniline (NPANI-Cu-X) was performed in the following solvents: H2O, DMF, DO, THF, ACTN and ACN, and then the solvent effects on the formation of NPANI-Cu-X (X represents the dopants, I- and BF4-) were investigated. NPANI-Cu-X was characterized using scanning electron microscopy (SEM), X-ray diffractions (XRD), energy-dispersive X-ray analysis (EDAX), Fourier transform infrared spectrometry (FTIR), Atomic Absorption spectrometer (AAS), Ultraviolet-visible spectrophotometers (UV-vis), thermal analysis (TGA, DTA) and electrical conductivity measurements. The results show that the solvent is effective in the formation of NPANI-Cu-X. This effect was observed in the polymer structures, conductivities, copper contents and crystalline structures. The NPANI-Cu-X polymers synthesized with the various solvents were notably different from each other because some of the solvents create a copper-solvent complex with the copper. To understand the influence of solvent type and Cu inclusion on photoelectric performance, the obtained PANI were employed as counter electrode in a DSSC configuration. The highest double layer capacitance (24.1 mu F), low charge transfer resistance (5.13 Omega) together with series resistance (14.62 Omega), and good photovoltaic performance with conversion efficiency (6.37%) for counter electrodes are obtained the NPANI-Cu-X in ACN solvent media which is higher than that fabricated with N-PANI in same solvent media (1.36%). These results represent a promising route for developing new counter electrodes of Pt-free DSSCs by Cu doping and choosing an appropriate solvent. (C) 2015 Elsevier B.V. All rights reserved.Öğe Exploring on Photovoltaic Performance of Dye-Sensitized Solar Cells Using Polyaniline as a Counter Electrode: Role of Aluminum-Solvent Interactions(Ieee-Inst Electrical Electronics Engineers Inc, 2017) Tas, Recep; Can, Muzaffer; Sonmezoglu, SavasIn this work, we successfully synthesized aluminumdoped polyaniline in various solvent media using chemical oxidation polymerization, and for the first time, investigated their applications as counter electrode (CE) in dye-sensitized solar cells (DSSCs). The experimental results (field emission scanning electron microscopy/energy dispersive X-ray analysis, atomic absorption spectrometer, Fourier transform infrared spectroscopy, thermogravimetric/differential thermal analysis, etc.) showed that critical properties such as crystallinity, conductivity, and surface area of PAni polymers can be controlled through both Al ions and/or solvent media. The photovoltaic performance of DSSCs was evaluated by current density-voltage (J-V) and external quantum efficiency measurements. The differences in the conversion efficiencies (eta) were explained based on the electrocatalytic abilities and electron transfer properties of CEs. Of the CEs in various solvents, the P@6 CE in acetone showed the best electrocatalytic ability and highest eta of 5.97%. This is even higher than that of the cell with Pt CE (5.75%). Furthermore, its stability under a prolonged irradiation is somewhat lower or close to the Pt CE, P@ 6 CE based DSSC showed the characteristics of rapid activity onset, high multiple start/stop capability, and superior irradiation stability. This novel concept-along with promising electrocatalytic activity and facile electron transfer-provides a new approach to enhance the photovoltaic performances of Pt-free DSSCs.Öğe Polyaniline micro-rods based heterojunction solar cell: Structural and photovoltaic properties(Amer Inst Physics, 2012) Sonmezoglu, Savas; Tas, Recep; Akin, Seckin; Can, MuzafferThe present paper reports the fabrication and photovoltaic characterization of pure and dodecyl benzene sulfonic acid (DBSA)-doped polyaniline (PAni) micro-rods polymer/n-Si heterojunction solar cells, and also the morphological and structural properties of pure and micro-rods PAni doping with DBSA. The device shows a strong photovoltaic behavior with a maximum open-circuit voltage V-oc of 0.83 V, a short-circuit current J(sc) of 14.72 mA cm(-2), fill factor FF of 0.54 resulting in an estimated device efficiency eta of 6.13% under simulated solar light with the intensity of 100 mW/cm(2). The results indicate that the Au/DBSA-doped PAni micro-rods/n-Si heterojunction structure might be promising for the solar cell applications. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4772019]Öğe Preparation and characterization of polyaniline microrods synthesized by using dodecylbenzene sulfonic acid and periodic acid(Scientific Technical Research Council Turkey-Tubitak, 2015) Tas, Recep; Can, Muzaffer; Sonmezoglu, SavasThe preparation of polyaniline (PANI) microrod arrays in the presence of dodecylbenzene sulfonic acid (DBSAH), a structure-directing agent, and in the presence of periodic acid (H5IO6), an oxidant in aqua-acidic media, was investigated. DBSAH was performed to distinguish the roles of both surfactant and dopant. The method of preparation of DBSAH and H5IO6 doped PANI (DBSAH-PANI) microrods in a reversed micelle had previously not been reported. The characterizations of the PANI microrods were determined by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, (EDX) and X-ray diffraction (XRD). Based on the SEM results, we found that PANI microrods occur in the presence of DBSAH in the polymerization medium, while the XRD results showed that PANI-DBSA gave clearer crystallinity than PANI. At room temperature, the DC conductivities of pure PANI and PANI-DBSA were 9.5 x 10(-2) S/cm and 9.2 x 10(-2) S/cm(-4) x 10(-2) S/cm, respectively, based on the molar ratio of DBSA. The experimental results suggested that it is possible to control both the electrical conductivities and the crystal structures of PANI microrods with DBSAH dopants' incorporation level.
