Abstract
Photovoltaic performance of dye-sensitized solar cell (DSSC) is enhanced by a two-step annealing process of the photoanode. The 1st-step of annealing is performed in oxygen at 450 °C for 30 min which effectively removes the residual organics originated from the TiO 2 precursor pastes. This enhances the dye adsorption on the TiO 2 nanoparticles and raises the short-circuit current density ( J SC). The 2nd-step of annealing is performed in nitrogen at 450 °C for 10 min which removes extra oxygen atoms resulted from the incorporation of oxygen atoms into the tin-doped indium oxide (ITO) film during the 1st-step of annealing. This reduces the sheet resistance of ITO and thereby enhances the fill factor (FF). With the enhanced J SC of 15.9mAcm −2 and FF of 0.65, the AM1.5 solar to electric conversion efficiency ( η) of DSSC reaches 6.7% which is better than that based on the conventional one-step air annealing ( η = 5.53%, J SC = 14.08 mA cm −2, FF = 0.6).
Published Version
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