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Effect of Different Electrolytes on the Efficiency of Dye Sensitized Solar Cells for Solar Energy Conversion

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Effects of different electrolytes of dye sensitized solar cells (DSSC) on the photovoltaic parameters were studied by electrochemical impedance spectroscopy (EIS). Copper (II) phthalocyanine (CuPc), Copper iodide (CuI) and 1-Methyl-3-propylimidazolium iodide (IL) were used as solid electrolytes. TiO2 semiconductor photoanode was synthesized by sol–gel method using urea as nitrogen source. The prepared TiO2 was characterized by N2 adsorption–desorption isotherm, X-ray diffraction (XRD), Raman and Fourier Transform Infra-Red (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), High Resolution Transmission electron microscopy (HRTEM) and Ultraviolet-Visible absorption spectroscopy. It was observed that open circuit voltage (V oc), short circuit current density (J sc), fill factor (FF) and conversion efficiency (η) decreases with using p-type semiconductor electrolyte and increases by using IL. Our results confirmed that it is essential to use low-viscosity iodide melts with smaller cations to achieve high-efficiency dye-sensitized solar cells. Electrochemical impedance spectroscopy (EIS) results indicate that the use of 1-Methyl-3-propylimidazolium iodide might passivate the surface recombination sites and increases the electron lifetime in the nanostructured TiO2 film, resulting in the improvement of the cell efficiency. The order of the activity of the electrolytes is IL > CuPc > CuI. The conversion efficiency was found to be 0.15, 0.88, and 1.47% for copper iodide, copper phthalocyanine and 1-Methyl-3- propylimidazolium iodide, respectively.
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Keywords: Conversion Efficiency; Dye Sensitized Solar Cells; Fill Factor; Open Circuit Potential; Photosensitizers

Document Type: Research Article

Affiliations: 1: Egyptian Petroleum Research Institute, 1-Ahmed El-Zomr St., P.O.Box 11727, Nasr City, Cairo, Egypt 2: Leibniz-Institut für Katalyse E. V. Albert-Einstein-Straße 29a, 18059 Rostock, Germany

Publication date: 01 June 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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