Keywords: ethyl cellulose, DSSCs, dye sensitised solar cells, hydrothermal, screen printing, nanostructures, TiO2 pastes, titanium dioxide, titania, nanotechnology
The effect of ethyl cellulose on TiO2 pastes for DSSCs application
Ethyl 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 TiO2sol 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 Jsc = 14.86 mA/cm², VOC = 0.75 V and FF = 0.64 under the AM1.5 with an illumination of 100 mW/cm².