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Iwaki, Japan

Wang H.,Queensland University of Technology | Liu M.,Queensland University of Technology | Zhang M.,CAS Changchun Institute of Applied Chemistry | Wang P.,CAS Changchun Institute of Applied Chemistry | And 3 more authors.
Physical Chemistry Chemical Physics | Year: 2011

The performance and electron recombination kinetics of dye-sensitized solar cells based on TiO2 films consisting of one-dimensional nanorod arrays (NR-DSSCs) which are sensitized with dyes N719, C218 and D205, respectively, have been studied. It has been found that the best efficiency is obtained with the dye C218 based NR-DSSCs, benefiting from a 40% higher short-circuit photocurrent density. However, the open circuit photovoltage of the N719 based cell is 40 mV higher than that of the organic dye C218 and D205 based devices. Investigation of the electron recombination kinetics of the NR-DSSCs has revealed that the effective electron lifetime, τn, of the different dye based NR-DSSCs shows the sequence of C218 > D205 > N719. The higher Voc with the N719 based NR-DSSC is originated from the more negative energy level of the conduction band of the TiO2 film. In addition, in comparison to the DSSCs with the conventional nanocrystalline particles based TiO2 films, the NR-DSSCs have shown over two orders of magnitude higher τn when employing N719 as the sensitizer. Nevertheless, the τn of the DSSCs with the C218 based nanorod arrays is only ten-fold higher than that of the nanoparticles based devices. The remarkable characteristic of the dye C218 in suppressing the electron recombination of DSSCs is discussed. © 2011 the Owner Societies. Source

Kajiyama S.,University of Tsukuba | Kajiyama S.,Chemicrea. Inc. | Uemura Y.,University of Tsukuba | Uemura Y.,Japan National Institute of Advanced Industrial Science and Technology | And 4 more authors.
Dyes and Pigments | Year: 2012

Organic dyes with the oligohexylthiophene linkage having several donor parts, carbazole, indole, and indoline, were newly synthesized as sensitizers for dye-sensitized solar cells. The carbazole was most efficient donor moiety for DSSCs among these dyes with the oligothiophene linkage. Carbazole dyes were adsorbed with larger amount of molecules on the TiO2 film than both indole dyes and indoline dyes. Therefore, both the VOC and the electron lifetime of DSSCs with the carbazole dyes were highly observed. The decreasing of JSC of DSSCs with indole and indoline dyes also caused by the reducing the adsorption amount of dyes. © 2011 Elsevier Ltd. All rights reserved. Source

Funabiki K.,Gifu University | Mase H.,Gifu University | Saito Y.,Dai ichi Kogyo Seiyaku Co. | Otsuka A.,Sekisuijushi Technical Research Corporation | And 7 more authors.
Organic Letters | Year: 2012

Novel near-infrared (NIR)-sensitizing (up to 800 nm) simple asymmetric squaraine dyes (Sq 31 and Sq 33) carrying indoline moieties that did not require the introduction of any linker groups were developed. DSSCs fabricated with Sq 33 exhibited remarkable characteristics in the long-wavelength visible and NIR region (up to 800 nm), such as a conversion efficiency of 3.75% (AM 1.5G) with an incident photon-to-current conversion efficiency of 63% (650 nm), a short-circuit photocurrent density of 13.64 mA, an open-circuit photovoltage of 0.48, and a fill factor of 0.57. © 2012 American Chemical Society. Source

Matsui M.,Gifu University | Tanaka N.,Gifu University | Kubota Y.,Gifu University | Funabiki K.,Gifu University | And 4 more authors.
RSC Advances | Year: 2016

An indoline dye having both α-cyanoacrylic acid and rhodanine acetic acid anchor groups at the acceptor moiety exhibited improved stability under fluorescence light irradiation. © The Royal Society of Chemistry 2016. Source

Matsui M.,Gifu University | Aoki R.,Gifu University | Nishiwaki D.,Gifu University | Kubota Y.,Gifu University | And 5 more authors.
RSC Advances | Year: 2015

To make a molecular design of efficient indoline dyes, fluorescence lifetimes should be longer than ca. 0.8 ns in chloroform, in addition to suitable HOMO and LUMO levels and bathochromic UV-vis absorption bands. © The Royal Society of Chemistry 2015. Source

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