Abstract
Herein we have reported the effects of deoxycholic acid (DCA) and porphyrin sensitization on the photovoltaic characteristics of titania aerogel-incorporated quasi-solid dye-sensitized solar cell (QS-DSSC). The obtained results showed that the co-adsorption with DCA results in improving the photovoltaic parameters such as photocurrent density (Jsc), Open-circuit voltage (Voc), fill factor (FF) and overall power conversion efficiency (η). For example, the device treated with DCA (labelled as DCA-1) delivered PCE (η) of 2.56 % (with Voc of 0.61 V), which is greater than those obtained for the unchanged device (labelled as 1) (η = 0.97 %, Voc = 0.53 V). The prime factors responsible for the above enhancement are increased electron injection, suppressed recombination and low electron transport resistance, as confirmed by the analysis of photoluminescence (PL) spectra, dye adsorption measurements, electrochemical impedance spectra (EIS) and time-dependent transient spectra for photocurrent /photovoltage.
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