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Chen C.-M.,National Chung Hsing University | Chen C.-H.,National Chung Hsing University | Cherng S.-J.,National Chung Hsing University | Wei T.-C.,Tripod Technology Corporation
Materials Chemistry and Physics | Year: 2010

A platinum (Pt) layer is electroless-deposited on indium tin oxide (ITO) glass substrate as the counterelectrode for dye-sensitized solar cells (DSSCs). Compared with other methods of depositing Pt layer, electroless deposition is simple, low-temperature, and easy to scale-up for industrial application. The Pt concentration of the electroless plating solution is found to play an important role in the cell performance. With increasing the Pt concentration, i.e. the Pt loading on the ITO surface, the resultant Pt layer exhibits a porous structure. Owing to the porous structure, the Pt layer can provide more active surface area for triiodide reduction and thus reduces the charge-transfer resistance. The cell performance is promoted accordingly with increasing the Pt concentration. Energy conversion efficiency of 6.46%, short-circuit current density of 15.04 mA cm-2, open-circuit voltage of 0.68, and fill factor of 0.63 can be achieved for the DSSC employing electroless-Pt counterelectrode. © 2010 Elsevier B.V. All rights reserved.


Wu M.-S.,National Kaohsiung University of Applied Sciences | Tsai C.-H.,National Kaohsiung University of Applied Sciences | Wei T.-C.,Tripod Technology Corporation
Chemical Communications | Year: 2011

A bifunctional TiO2 layer having an inner compact layer and an outer anchoring layer coated on fluorine-doped tin oxide (FTO) glass could reduce the charge recombination and interfacial contact resistance between FTO and the main TiO2 layer; photoelectron conversion efficiency of cell was increased from 7.31 to 8.04% by incorporating the bifunctional layer. © The Royal Society of Chemistry.


Lin J.-Y.,Tatung University | Liao J.-H.,Tatung University | Wei T.-C.,Tripod Technology Corporation
Electrochemical and Solid-State Letters | Year: 2011

In this study, a transparent CoS counter electrode (CE) fabricated by potentiodynamic deposition was incorporated in a Pt-free dye-sensitized solar cell (DSSC). The CoS CE fabricated by potentiodynamic deposition was observed with high transparency and honeycomblike morphology. Thus it exhibited a low charge-transfer resistance of ∼1.45 cm2 in comparison with a sputtered-Pt CE (∼2.03 cm2). The DSSC assembled with the CoS CE showed a superior photovoltaic conversion efficiency of 6.01 to that with the sputtered-Pt CE (5.71) due to the higher photocurrent density (14.17 mA cm -2) under full sunlight illumination (100 mW cm-2, AM 1.5G). © 2011 The Electrochemical Society.


Wu M.-S.,National Kaohsiung University of Applied Sciences | Tsai C.-H.,National Kaohsiung University of Applied Sciences | Jow J.-J.,National Kaohsiung University of Applied Sciences | Wei T.-C.,Tripod Technology Corporation
Electrochimica Acta | Year: 2011

Surface modification of porous TiO 2 photoanode with a thin compact TiO 2 layer was carried out by means of anodic electrodeposition in an aqueous TiCl 3 electrolyte. Results indicated that the electrodeposited thin TiO 2 layer could bridge gaps between TiO 2 nanoparticles and improve the electrical contact at the FTO (fluoride-doped tin oxide)/TiO 2 interface, leading to an efficient electron transport. In addition, the thin compact TiO 2 layer could cover the exposed surface area of FTO to the electrolyte, which contributes to the suppression of the charge recombination. The surface treatment of mesoporous TiO 2 photoanode via aqueous electrochemical route is an effective way to improve the performance of DSSC (dye-sensitized solar cell), which could increase the short-circuit current density, and reduce the dark current density compared to DSSCs with bare and TiCl 4-treated TiO 2 photoanodes. The photoelectron conversion efficiency of DSSC was increased from 7.3 to 8.2% after employing the TiO 2-modified photoanode. © 2011 Elsevier Ltd.


Lin C.-Y.,National Tsing Hua University | Lin J.-Y.,Tatung University | Wan C.-C.,National Tsing Hua University | Wei T.-C.,Tripod Technology Corporation
Electrochimica Acta | Year: 2011

This study demonstrates platinum (Pt) counter electrodes with low charge-transfer resistance (R ct), low Pt loading and high active surface area can be obtained within 30 s by using the direct-current deposition in the presence of 3-(2-aminoethylamino)propyl-methyldimethoxysilane (Me-EDA-Si) as an additive. The addition of appropriate Me-EDA-Si can not only enhance the current efficiency but also inhibit the growth of semicircle-like grains, thus resulting in Pt electrode with high active surface area. Consequently, the dye-sensitized solar cells (DSSCs) fabricated with so-prepared Pt electrodes exhibited cell efficiency of 7.39% while 0.01 vol% Me-EDA-Si was added, which is much superior to that with sputtered-Pt electrodes under the same assembly conditions. © 2010 Elsevier Ltd.

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