Improving photochemical properties of Ipomea pescaprae, Imperata cylindrica (L.) Beauv, and Paspalum conjugatum Berg as photosensitizers for dye sensitized solar cells
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This paper reports on the improving photochemical properties of natural dye using acid treatment, coadsorber addition, and dye combination. The natural pigments have been extracted from Ipomea pescaprae, Imperata cylindrica (L.) Beauv, and Paspalum conjugatum Berg containing quercetin 3-O-β-d-glucofuranoside, graminone B, and chlorophyll a. The dyes have been successfully sensitized on TiO2 anatase nanoparticles as photoelectrodes for the dye-sensitized solar cell. The cells were illuminated under 100 mW/cm2 AM 1.5 condition. It is investigated that the acidic treatments have been successfully improving the cell efficiencies of I. pescaprae dye from 0.45 to 0.53 %, I. cylindrica dye from 0.44 to 0.48 %, and P. conjugatum dye from 0.50 to 0.69 %. The acidic treatment leads to broaden the dye spectrum absorption and cell efficiency. Moreover, the addition of coadsorber into I. pescaprae dye is able to improve its cell efficiency from 0.53 to 0.55 % with J sc of 3.738 mA/cm2, Voc of 0.393 V, and the FF of 0.377. The combination of dyes from I. pescaprae with efficiency of 0.27 % and P. conjugatum with efficiency of 0.55 % could be improved to be 0.76 %. In conclusion, we prove that the acidic treatment, coadsorber addition, and dyes combination play a significant role in improving the photochemical properties of natural dye sensitized solar cell.
KeywordsTiO2 Quercetin Cell Efficiency Photoelectric Conversion Efficiency Imperata Cylindrica
This research underlying this paper is partially supported by Research Funding of Ministry of Education and Culture under the scheme of Decentralization Research Program (Program Desentralisasi DIKTI) 2013.
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