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3, 3'- Dithiodipropionic acid as co-adsorbent along with poly(ethyl thieno[3,4-b]thiophene-2-carboxylate) for efficient NIR sensitization of TiO2 photoelectrode

2009년 8월 21일 15시 04분 53초
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금 <발표Ⅳ>
저자 및
Viswanathan S. Saji, 표명호
순천대학교 화학과, Korea
Recently, organic dyes have attracted considerable research interest as potential substitutes for the Ru-based metal-ligand counterparts for sensitization of nanocrystalline photoelectrode in dye sensitized solar cells; as they are attractive in terms of easy availability, cost and environmentally friendly nature. When considering the quantum of research done in organic dyes, reported information available on conjugated polymer based dyes is limited. It has been proved that the possible polymer aggregation onto the photoelectrode can be minimized by effective use of small molecular weight co-adsorbents. In the present investigation, we have employed a newly synthesized thieno[3,4-b]thiophene based polymer, having near infra red region (NIR) absorption as the sensitizer. NIR sensitization of the nanocrystalline TiO2 electrode can significantly improve the cell efficiency. 3,3'-dithiodipropionic acid was investigated as a novel co-adsorbent. Photoelectrodes sensitized with the NIR dye, with and without co-adsorbent, were characterized using UV-Visible spectroscopy, SEM, TEM and XRD. The photocurrent and photovoltage were measured using a Potentiostant/Galvanostat under AM 1.5 simulated sunlight at 100 mW cm-2. The results of the study revealed that the co-adsorbent in optimum composition significantly enhanced the polymer adsorption onto the nanocrystalline electrode which further enhanced the current conversion efficiency. The study proved that 3,3'-dithiodipropionic acid is a promising co-additive that enhanced the conjugation length of the adsorbed polymer. The newly synthesized polymer dye possesses significant promise as an efficient NIR sensitizer in DSSC applications.