Thin Solid Films, Vol.520, No.23, 7018-7021, 2012
Preparation of TiO2 paste using poly(vinylpyrrolidone) for dye sensitized solar cells
The surface morphology of titanium oxide (TiO2) films as a photoanode in dye sensitized solar cells plays a vital role in converting light to electricity. Therefore, TiO2 films were prepared using TiO2 paste with different compositions of poly(vinylpyrrolidone) (PVP) as a binder to optimize their physico-chemical properties. The paste was prepared with commercial TiO2 powder mixed with acetylacetone, PVP, 4-octylphenol polyethoxylate, acetic acid and ethanol. The chemical composition remains the same for all pastes except PVP. The quantity of the PVP was optimized in such a way that it provides a thick film with a good network connection. The impact of the quantity of PVP in the TiO2 paste was analyzed. The prepared TiO2 film structure was characterized by X-ray diffraction. The surface morphology was analyzed by scanning electron microscopy. The electrochemical performance of the prepared TiO2 as a photoanode was also investigated. Among the four different photoanodes, the cells fabricated with a TiO2 film prepared with 0.4 g of PVP exhibited the highest power conversion efficiency of 6.77%, short-circuit photocurrent density and open circuit voltage of 12.38 mA/cm(2) and 0.77 V, respectively. (C) 2012 Elsevier B. V. All rights reserved.
Keywords:Semiconductors;Nanomaterials;Polymer;Poly(vinylpyrrolidone);Power conversion efficiency;Solar cells;Titanium dioxide