Evaluation of dye aggregation and effect of deoxycholic acid concentration on photovoltaic performance of N749-sensitized solar cell
- Evaluation of dye aggregation and effect of deoxycholic acid concentration on photovoltaic performance of N749-sensitized solar cell
- 방소연; 고민재; 김경곤; 김종학; 장인혁; 박남규
- dye-sensitized solar cell; N749; Black dye; solar cell; Deoxycholic acid; Co-adsorbent; Aggregate
- Issue Date
- Synthetic metals
- VOL 162, NO 17-18, 1503-1507
- Black dye, coded N749, solutions with different concentration of deoxycholic acid (DCA) were prepared
and effect of DCA concentration on photovoltaic property was investigated. Photocurrent density was
improved by addition of DCA ranging between 2 mM and 20 mM, while little changes in voltage and
fill factor were observed. High concentration of 100 mM DCA, however, deteriorated photovoltaic performance
due to the significant decrease in photocurrent density. Photocurrent density of 15.6 mA/㎠ observed without DCA was improved to 16.5 mA/㎠ after addition of 10 mM DCA in N749 solution,
while the amount of the adsorbed dye was decreased from 60.9 mmol to 51.3 mmol per cubic centimeter
of TiO2. Based on changes in photocurrent density and amount of the adsorbed dye, the faction of dye
aggregation, which could not contribute to photocurrent generation, was estimated to be about 40%.
The large fraction of dye aggregation was thus responsible for low photocurrent density, which could be
resolved by addition of DCA. Based on an optimal condition of 10 mM DCA and 30-μm-thick TiO2 film
with light scattering layer, conversion efficiency of 9.1% was demonstrated at full sun illumination.
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