Efficient dye-sensitized solar cell based on a new porphyrin complex as an inorganic photosensitizer
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Ó Indian Academy of Sciences Sadhana (0123456789().,-volV)FT3](0123456 789().,-volV)
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Efficient dye-sensitized solar cell based on a new porphyrin complex as an inorganic photosensitizer AZAM NASIRIAN*, VALIOLLAH MIRKHANI*, MAJID MOGHADAM*, SHAHRAM TANGESTANINEJAD and IRAJ MOHAMMADPOUR BALTORK Catalysis Division, Department of Chemistry, University of Isfahan, 81746-73441 Isfahan, Iran E-mail: [email protected]; [email protected]; [email protected] MS received 15 December 2019; revised 14 February 2020; accepted 17 February 2020
Abstract. The synthesis of new porphyrin complexes that can absorb light in a broad range of the spectrum is very important for getting a high efficiency in dye-sensitized solar cells. The primary reason for using these complexes is good photophysical characteristic like good absorption and high quantum efficiency. Most of the metal porphyrin shows good photophysical characteristics with changing their ligands. In this work, the synthesis of a new Zn-porphyrin complex, that has a good spectral and electrochemical characteristic, is reported. Then, this complex is used as a dye in dye-sensitized solar cells, using titanium dioxide as a semiconductor. The application of this complex in a dye-sensitized nanocrystalline TiO2 solar cell has indicated a short circuit density of 11.60 mA, an open circuit potential of 0.65 V with an overall efficiency of 5.33%. The overall conversion efficiency of this system is due to the efficient electron injection into the conduction band during light absorption. Keywords. Dye-sensitizedtized solar cell; sensitizing dye; titanium dioxide; electron transfer; Zn-porphyrin complex.
1. Introduction Dye-sensitized solar cells (DSSCs) are cheap and they are a good option instead of p-n junction cells.1 These days the manufacturing of DSSCs has picked up interest because of the low cost and simple fabrication of them comparing to silicon solar cells.2 DSSCs are manufactured by the sandwich arrangement of two electrodes; anode electrode that consists of TiO2 or SnO2 thin layer coated with dye, and platinum (Pt) that used as a coated counter electrode. The space between two electrodes is filled with a redox pair electrolyte, such as I-/I3-.3–6 Various factors influence the photovoltaic efficiency of DSSCs. For improving the efficiency of the DSSCs, their fragments such as semiconductor, dye, and electrolyte are used to improve the results in different works. The mesoporous TiO2 thin film and sensitizers have an important role in improving solar cell efficiency. DSSCs is a photoelectrochemical solar cell that consists of complex photoexcited reactions, electro-chemical reactions, electron transports at different interfaces in
the cell, photocatalytic reaction. The interfacial energetics and kinetics are important in DSSCs because this information allows us to know how to reduce energy loss and achieve high efficiency, both of which are strongly dependent on the precise determination of energy levels and the complete realization of react
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