Title: Enhanced light-harvesting capability by phenothiazine in ruthenium sensitizers with superior photovoltaic performance
Authors: Yin, Jen-Fu
Chen, Jian-Ging
Lin, Jiann-T'suen
Bhattacharya, Dibyendu
Hsu, Ying-Chan
Lin, Hong-Cheu
Ho, Kuo-Chuan
Lu, Kuang-Lieh
Department of Materials Science and Engineering
Issue Date: 2012
Abstract: This paper reports on the design and synthesis of two new ruthenium dyes [Ru(dcbpy)(potip)(NCS)(2)] (JF-3, dcbpy 4,4'-dicarboxylic acid-2,2'-bipyridine, potip 2-(4-(10H-phenothiazin-10-yl)-5-octylthiophen- 2-yl)-1H-imidazo[4,5-f][1,10] phenanthroline, and [Ru(dcbpy)(dpotip)(NCS)(2)] (JF-4, dpotip = 2-(4-(N,N-diphenylamino)-5-octylthiophen-2-yl)-1H-imidazo[4,5-f][1,10] phenanthroline) that contain electron-donating phenothiazine-based or N,N-diphenylamino-based ancillary ligands. The ruthenium dye JF-3, in which an excellent electron-donating phenothiazine is incorporated, shows superior DSC performance (9.1%; compared to 8.8% for N3). A comparison of the electron-donating phenothiazine and N, N-diphenylamino groups utilized in the molecular architecture of ruthenium dyes demonstrates that the phenothiazine group efficiently increases the molar extinction coefficient of band II and also broadens that band in the UV-vis absorption spectrum, reduces device resistance, increases electron lifetime, and enhances power-conversion efficiency. This finding not only clarifies the significance of multifunctionalized design in the molecular architecture of ruthenium dyes, but also represents an alternative route for the introduction of an excellent electron-donating group for improving the light-harvesting characteristics of ruthenium dyes as well as DSC performance.
URI: http://hdl.handle.net/11536/14883
ISSN: 0959-9428
DOI: 10.1039/c1jm13178h
Volume: 22
Issue: 1
Begin Page: 130
End Page: 139
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