DongWoo Fine Chemical

Iksan, South Korea

DongWoo Fine Chemical

Iksan, South Korea
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Patent
Samsung and Dongwoo Fine Chemical | Date: 2016-01-11

A thinner composition including an acetate-based compound in an amount in a range of about 30 weight percent to about 70 weight percent, a lactate-based compound in an amount in a range of about 1 weight percent to about 20 weight percent, a propionate-based compound in an amount in a range of about 30 weight percent to about 60 weight percent, and an ether-based additive in an amount in a range of about 10 ppm to about 500 ppm, based on a total amount of the composition.


Patent
Samsung and Dongwoo Fine Chemical | Date: 2010-09-28

A photoresist composition includes an alkali-soluble resin, a dissolution inhibitor including a quinone diazide compound, a first additive including a benzenol compound represented by the following Chemical Formula 1, a second additive including an acrylic copolymer represented by the following Chemical Formula 2 and an organic solvent. Accordingly, heat resistance of a photoresist pattern may be improved, and the photoresist pattern may be readily stripped. As a result, crack formation in the photoresist pattern may be reduced and/or prevented.


Yoo B.,Korea University | Lim M.K.,DongWoo Fine Chemical | Kim K.-J.,Korea University
Current Applied Physics | Year: 2012

The effects of the Pt catalyst sputter deposited on the patterned ITO glass (SD-Pt/pITO) on the photovoltaic properties and charge-transfer characteristics at the Pt/electrolyte interface of dye-sensitized solar cells (DSSCs) are studied and compared with those of a conventional Pt counter electrode deposited by thermal reduction on fluorine-doped tin oxide (FTO) glass (TD-Pt/FTO). The DSSC with the SD-Pt/pITO (sample cell) shows a lower charge-transfer resistance than that of the DSSC with the TD-Pt/FTO (reference cell), which leads to an improvement of its fill factor by about 7.6%. The long-term durability test performed for 1000 h at room temperature reveals that the sample cell retains up to 99% of its energy conversion efficiency, while that of the reference cell is degraded by about 7.2%. © 2012 Elsevier B.V. All rights reserved.


Lee S.Y.,Korea University | Yoo B.,Korea University | Lim M.K.,DongWoo Fine Chemical | Lee T.-K.,Korea University | And 2 more authors.
Langmuir | Year: 2010

Nylon 6 fibers are used, for the first time, in dye-sensitized solar cells (DSSCs). The overall energy conversion efficiency obtained with 0.18 M nylon 6 reaches 6.2%, which is comparable to that (6.7%) obtained without adding nylon 6 on the day of cell fabrication. However, it is found that the long-term stability of the DSSCs with nylon 6 is superior to that of a reference electrolyte as a result of the complexation of nylon 6 with I3 -. Furthermore, nylon 6 is found to be a corrosion inhibitor for silver metal in the electrolyte containing I3 -. © 2010 American Chemical Society.


Jung Y.-S.,Korea University | Sathiya Priya A.R.,Korea University | Lim M.K.,DongWoo Fine Chemical | Lee S.Y.,DongWoo Fine Chemical | Kim K.-J.,Korea University
Journal of Photochemistry and Photobiology A: Chemistry | Year: 2010

A highly viscous liquid electrolyte is prepared by adding a small amount of amylopectin into dimethylsulfoxide solvent. By using this viscous electrolyte, a dye-sensitized solar cell (DSSC) enhances the short-circuit photocurrent density and solar-to-electricity conversion efficiency by 22% and 8.4%, respectively, compared to those obtained with the reference cell without amylopectin. Furthermore, the stability of the DSSC is enormously improved by the addition of amylopectin. Polarization curves indicate that amylopectin is a reasonable corrosion inhibitor for silver metal in the electrolyte containing I3 -/I- couple. © 2009 Elsevier B.V.

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