The effect of ethyl cellulose on TiO₂ pastes for DSSCs application
by Hsiou-Hsuan Wang; Chaochin Su; Chung-Ying Wu; Hon-Bin Tsai; Wen-Ren Li
International Journal of Nanotechnology (IJNT), Vol. 11, No. 12, 2014

Abstract: 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 J_sc = 14.86 mA/cm², V_OC = 0.75 V and FF = 0.64 under the AM1.5 with an illumination of 100 mW/cm².

Online publication date: Fri, 06-Feb-2015

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