Photovoltaic performance of dye-sensitized solar cells fabricated with polyvinylidene fluoride-polyacrylonitrile-silicondioxide hybrid composite membrane

Electrospun fibrous membranes of hybrid composites of polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN) and silicon dioxide (SiO2) (PVdF-PAN-SiO2) are prepared with different proportions of SiO2 (3, 5 and 7% w/w). The field emission scanning electron microscopy (FE-SEM) reveals that these membranes have three-dimensional, fully interconnected network structures, which are combined with micropores of fine SiO2 distribution. The surface roughness of the membranes increases with increasing the SiO2 content. It is found that 7 wt% SiO2/PVdF-PAN electrolyte membrane has the highest ionic conductivity (6.96 x 10(-2) S cm(-1)) due to the large liquid electrolyte uptake (about 570%). As the concentration of SiO2 nanoparticles increase, the contact angle value also increases, ranging from 135.70 degrees to 140.60 degrees which indicates that the membrane has higher hydrophobicity. The dye sensitized solar cells (DSSCs) are fabricated using the hybrid composite membrane with PVdF-PAN with 7 wt % SiO2. Its photovoltaic performance exhibits an open circuit voltage (V-oc) of 0.79 V and a short circuit current 11.6 mA cm(-2) at an incident light intensity of 100 mW cm(-2), producing an efficiency of 5.61%. DSSC, using the hybrid composite electrospun membrane which shows more stable photovoltaic performance than other assembled DSSCs. (C) 2013 Elsevier B.V. All rights reserved.