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Thuy, Chau Thi Thanh,Park, Ji Young,Lee, Seung Woo,Suresh, Thogiti,Kim, Jae Hong American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.5
<P>In our present study, polypyrrole-1 (PPy1), polypyrrole-2 (PPy2), and polypyrrole-2/multi wall carbon nanotube composite film (PPy2/MWCNT) were proposed as counter electrodes (CEs) in dye-sensitized solar cells (DSSCs) to replace the precious Pt CE. These films were fabricated on fluorine-doped tin oxide substrates by using a facile electrochemical polymerization route, and served as CEs in DSSCs. It is shown that the introduction of anionic surfactant, sodium dodecyl sulfate (SDS), enhanced the catalytic activity, thus leading to an improvement in the performance of PPy2. Further, introduction of MWCNT resulted in increase in conversion efficiency of DSSCs with PPy2/MWCNT composite film. The Tafel and electrochemical impedance analysis revealed that the PPy2 and PPy2/MWCNT CEs prepared with anionic surfactant possessed more catalytic activity and lower charge transfer resistance in comparison with PPy1-based CE. This resulted in a better conversion efficiency of 5.88% for PPy2/MWCNT-based DSSC under 1 sun condition, reaching 86% of the DSSC based on reference Pt counter electrode (6.86%). These results indicate that the composite film with high catalytic properties for I-3(-) reduction can potentially be used as the CE in a high-performance DSSC.</P>
Mass transfer properties of cobalt eelectrolyte in dye-sensitized solar cells
( Nguyen Thi Hai ),김영락,( Chau Thi Thanh Thuy ),강지윤,김재홍 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Cobalt electrolyte is one of promising alternative red-ox couples shuttles in DSSCs. In this study, the effect of diffusion coefficient of two different cobalt (II)/(III) electrolytes on the photovoltaic performance of DSSCs are investigated using organic dye containing triphenylamine based chromophore with different anchors/acceptors. [Co(bpy)3]2+/3+ and [Co(dtb)3]2+/3+ (where bpy = tris-(2,2'-bipyridine) and dtb = tris-(4,4'-di-tert-butyl-2,2'-bipyridine)) are prepared, and then applied to the red-ox shuttles of DSSCs. Their diffusion coefficients are estimated by linear sweep voltammetry (LSV) with various scan rates. The diffusion coefficient of [Co(bpy)3]2+/3+ and [Co(dtb)3]2+/3+ in prepared electrolyte are 1.91×10-7 and 2.27×10<sup>-8</sup> ㎠/s, respectively. The high diffusion coefficient of [Co(bpy)3]2+/3+ leads to the 2.4 times higher total ionic conductivity of the electrolyte than [Co(dtb)3]2+/3+-based electrolyte. [Co(bpy)3]2+/3+-based electrolyte exhibits the higher DSSCs photovoltaic performance.
이용희,( Chau Thi Thanh Thuy ),( Suresh Thogiti ),한윤수,김재홍 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Dye-sensitized solar cells (DSSCs) have attracted much attention of many research groups on account of their benefits, for instance, of low-cost fabrication process with decently high solar energy-to-conversion efficiencies compared to conventional p-n junction solar cells. The organic dyes with double electron acceptors have recently been reported to be very favorable for the DSSCs, compared to those with single electron acceptor, due to the more efficient electron extraction paths from electron donor and the higher molar extinction coefficients. In this article, we have developed novel organic dyes which have phenothiazine moieties as an electron donor in their charge-transfer chromophore for application of DSSCs. We had synthesized a series of phenothiazine derivatives which have different wave length absorbing chromophore in the molecule with high molar extinction coefficient.
조정민,( Chau Thi Thanh Thuy ),( Suresh Thogiti ),이도경,김재홍 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Dye sensitized solar cells are currently attracting widespread academic and commercial interest for the conversion of sunlight into electricity because of their low cost and high efficiency. Among of them, the performance of DSSCs based on organic dyes have been remarkably improved. Organic dyes have many advantages as photosensitizers, such as large molar extinction coefficient, control of absorption wavelength, facile design and synthesis, and lower cost than ruthenium complexes. Therefore, it is expected that organic dyes could compete with ruthenium complexes in the near future. So, We report that a combined experimental and computational study of several ruthenium(II) sensitizers and organic sensitizers.
장보윤,( Chau Thi Thanh Thuy ),백상민,( Ho Phuong ),한윤수,김재홍 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A dye sensitized solar cell (DSSC) employing a polypyrrole-1 (PPy1), polypyrrole-2 (PPy2) and polypyrrole-2/multi wall carbon nanotube composite film (PPy2/MWCNT) counter electrodes (CEs) modified by different electrolyte composition. It is shown that the introduction of anionic surfactant, sodium dodecyl sulfate (SDS), enhanced the catalytic activity, thus leading to an improvement in the performance of PPy2. Further, introduction of MWCNT resulted in increase in conversion efficiency of DSSCs with PPy2/MWCNT composite film.
장보윤,( Chau Thi Thanh Thuy ),김세현,김재홍 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The development of high performance flexible photovoltaic devices is essentially required for achieving successful commercialization. In addition, dye sensitized solar cells (DSSCs) system have been extensively studied due to their economic and environmental advantages. In this research, we introduce the low temperature treatment of TiO<sub>2</sub> layer by using UV irradiation, which is proper to fabricating flexible devices. Here, indium-doped tin oxide (ITO) electrode is used for transparent conductive electrode because various kinds of flexible substrates consist of polymer and ITO. TiO<sub>2</sub> paste is layered on ITO electrode and post-treated under the irradiation of UV light for removing organic binder. For comparison, TiO<sub>2</sub>/ITO electrode is prepared by thermal treatment at high temperature.