Abstract

An organic nitrogenous compound benzotriazole was employed as a plasticizer in nanocrystalline dye‐sensitized solar cells (nDSSC) incorporating a polymer electrolyte based on poly (ethylene oxide) (PEO). Detailed studies have been made on the structural and electrical characterization of the polymer electrolyte using X‐ray diffraction (XRD), impedance spectroscopy and Scanning Electron Microscopy (SEM). Due to the coordinating and plasticizing effects of benzotriazole, enhanced ionic conductivity and reduced crystallinity of PEO polymer electrolyte accompanied by a better penetration of the same into the dye coated nanocrystalline TiO2 in order to enhance its efficiency were achieved. Based on the new polymer electrolyte, a nanocrystalline DSSC with a fillfactor of 0.53, an open‐circuit voltage (Voc) of 695 mV, short‐circuit current (Jsc) of 6.3 mAcm−2 and sun light to electricity conversion efficiency of 4.6% were obtained under AM 1.5 irradiation at 50 mWcm−2.

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