The effect of ethyl cellulose on TiO2 pastes for DSSCs application

cellulose (EC)-based TiO2 pastes were prepared in order to fabricate flat and crack-free TiO2 films employing screen-printing technique. Pure anatase TiO2 was synthesised via hydrothermal process using titanium (IV) n-butoxide as Ti-precursor and peptised by acetic acid. The as-prepared TiO2 sol was employed in making a series of pastes with various weight ratios of ethyl cellulose for screen-printing the TiO2 electrode for dye sensitised solar cells (DSSCs). The printed TiO2 electrodes were characterised by surface profile meter, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The printed TiO2 electrode observed under the micro-scale condition exhibited a porous and crack-free structure. After the DSSCs performance measurement, the amount of dye adsorbed on TiO2 electrodes was determined by UV-vis. The DSSCs made from paste with 5.82 wt% of EC demonstrated a high energy conversion efficiency of 7.17% with J(sc) = 14.86 mA/cm(2), V-OC = 0.75 V and FF = 0.64 under the AM1.5 with an illumination of 100 mW/cm(2).