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Lee C.-L.,Nation University | Lee W.-H.,Nation University | Yang C.-H.,R2 Technology
Journal of Materials Science | Year: 2013

Triazoloisoquinoline-based organic dyestuff was synthesized and used in the fabrication of dye-sensitized solar cells (DSSCs). After co-sensitization with ruthenium complex, triazoloisoquinoline-based organic dyestuff overcomes the deficiency of ruthenium dyestuff absorption in the blue part of the visible spectrum. The incident photon-to-electron conversion efficiency (IPCE) of cis-dithiocyanate-N,N′-bis-(4-carboxylate-4-tetrabutyl ammoniumcarboxylate-2,2′-bipyridine)ruthenium(II) (N719) at shorter wavelength regions (~350-500 nm) is 35 %. After addition of triazoloisoquinoline-based dyestuff for co-sensitization, the IPCE at 350-500 nm increased significantly. This can be attributed to the increased photocurrent of the cells, which improves the dye-sensitized photoelectric conversion efficiency. After optimization of the cells, an energy conversion efficiency of 8.83 % was achieved using an 12 + 4 μm TiO2 electrode, under simulated solar illumination (AM 1.5G). As a consequence, this low molecular weight organic dyestuff is a promising candidate as a co-adsorbent and co-sensitizer for highly efficient DSSCs. © 2013 Springer Science+Business Media New York. Source

Wu B.-L.,National Taiwan University of Science and Technology | Chao H.-J.,National Taiwan University of Science and Technology | Chen C.-P.,Ming Chi University of Technology | Yang C.-H.,R2 Technology | Chang J.-Y.,National Taiwan University of Science and Technology
RSC Advances | Year: 2015

In this work, we present the synthesis of Cdx:CuInS2 quaternary quantum dots (q-QDs) using a one-pot non-injection approach of alloying CuInS2 with Cd2+. Photoluminescence measurements showed that an increase in the Cd mole fraction in Cdx:CuInS2 q-QDs caused a systematic blue-shift in the QD emission wavelength. The as-prepared Cdx:CuInS2 q-QDs exhibited emissions in the range of 560-645 nm, and a maximum fluorescence quantum yield of 22%. Time-resolved photoluminescence measurements indicated that the average lifetime of Cdx:CuInS2 q-QDs became shorter compared to that of the CuInS2 ternary QDs (t-QDs), clearly indicating that a certain amount of Cd2+ defects exist inside the CuInS2 host. The photovoltaic performance of QD-sensitized solar cells (QDSSCs) was investigated by sandwiching a polysulfide electrolyte between Cdx:CuInS2 q-QDs photoanodes and Cu2S photocathodes. A maximum energy conversion efficiency of 1.74% was obtained under AM1.5 G simulated solar light for the cell fabricated with Cdx:CuInS2 q-QDs (x = 1) as the sensitizer, which is about 70% and 35% better than the cells sensitized with pristine CuInS2 t-QDs and Zn:CuInS2 q-QDs, respectively. More interestingly, it was noted that JSC systematically improved as the quantum yields of Cdx:CuInS2 q-QDs increased, resulting in an enhancement in power conversion efficiency. Furthermore, the power conversion efficiency of the solar cells co-sensitized with Cd:CuInS2 and CdSe can be elevated further to an encouraging 2.86%. © 2015 The Royal Society of Chemistry. Source

Hologic and R2 Technology | Date: 2008-05-20

Medical system, namely, computer software that facilitates the retention, magnification, identification, comparison, display, review, analysis and highlighting of abnormal anatomical features in radiological images used for the detection, analysis and diagnosis of cancer and disease abnormalities.

Hologic and R2 Technology | Date: 2008-04-29

Computer software sold as an integral component of a medical system comprised of computer software and computer hardware components that facilities the magnification, identification, comparison, display, review, analysis of and highlighting of radiological images by providing an interactive, high definition view of radiological images in order to detect, analyze and diagnose abnormal anatomical features likely to lead to disease abnormalities.

Lee C.-L.,Nation University | Lee W.-H.,Nation University | Li W.-T.,R2 Technology | Yang C.-H.,R2 Technology | Kao P.-C.,National Chiayi University
Materials Research Bulletin | Year: 2013

Efficient flexible dye-sensitized solar cells (DSSCs) using a stainless steel (StSt) substrate for preparing nanocrystalline TiO2 film electrodes were developed. Large active area (>1 cm2) and SiO x/ITO free StSt DSSCs were fabricated for a systematic investigation. As cell area increased from 1 cm2 (device A) to 4 cm2 (device D) the power conversion efficiency dropped significantly, mostly due to a decrease in the fill factor (FF) and suppression of the short-circuit current density (Jsc). By integrating small-area cells onto StSt substrate to fabricate the large-area DSSC (device C), Rsheet-TCO (sheet resistance of the TCO) can be reduced significantly, yielding the improved performance of the DSSCs. Compared with other methods to prepare StSt-based photoelectrodes, such as sputtering, we provide a simple, low cost and suitable method for the large scale preparation of DSSCs. © 2013 Elsevier Ltd. All rights reserved. Source

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