title: Organic Photosensitizers Incorporating Rigidified Dithieno[3,2-f:2',3'-h]quinoxaline Segment Tethered with Thiophene Substitutes for Dye-Sensitized Solar Cells.
abstract: Metal-free D-π-RS-π-A type sensitizers, consisting of triphenylamine as the electron donor, 2,3-bis(3-(2-ethylhexyl)-5-methylthiophen-2-yl)dithieno[3,2-f:2',3'-h]quinoxaline (DTQT) as the rigidified conjugation spacer (RS), thiophene as the π-spacer, and 2-cyanoacrylic acid as the acceptor/anchor, have broad absorption spectra ranging from 350 to 550 nm and a high molar extinction coefficient up to >46 200 M(-1) cm(-1). Under simulated AM 1.5 G illumination, the dye-sensitized solar cells (DSSCs) fabricated from the dyes exhibited light-to-electricity conversions in the range of 6.78% to 8.27%. The best efficiency is slightly higher than that of N719-based standard DSSC (7.92%). The efficiency can be further boosted to 8.51% by optimizing the concentration of LiI electrolyte.
authors: Institute of Chemistry, Academia Sinica , 115 Nankang, Taipei, Taiwan.
authors: Jen-Shyang
authors: JS
authors: Ni
authors: Institute of Chemistry, Academia Sinica , 115 Nankang, Taipei, Taiwan.|Department of Molecular Science and Engineering, National Taipei University of Technology , Da'an 10608, Taipei, Taiwan.
authors: Tang-Yao
authors: TY
authors: Chiu
authors: Institute of Chemistry, Academia Sinica , 115 Nankang, Taipei, Taiwan.
authors: Wei-Siang
authors: WS
authors: Kao
authors: Institute of Chemistry, Academia Sinica , 115 Nankang, Taipei, Taiwan.
authors: Hao-Ju
authors: HJ
authors: Chou
authors: Department of Molecular Science and Engineering, National Taipei University of Technology , Da'an 10608, Taipei, Taiwan.
authors: Chao-Chin
authors: CC
authors: Su
authors: Institute of Chemistry, Academia Sinica , 115 Nankang, Taipei, Taiwan.
authors: Jiann T
authors: JT
authors: Lin
keywords: DSSC; J-aggregation; dithienoquinoxaline; dye-sensitized solar cells; organic sensitizer