title: Organic dyes with a fused segment comprising benzotriazole and thieno[3,2-b]pyrrole entities as the conjugated spacer for high performance dye-sensitized solar cells.
abstract: Sensitizers with a fused segment comprising electron deficient benzotriazole () and electron rich thiophene or thieno[3,2-b]pyrrole entities as the conjugated spacer have been synthesized for dye-sensitized solar cells (DSSCs). The power conversion efficiency (PCE) increases with elongation of the conjugated spacer, and the dye with the dithieno[3,2-b]pyrrolobenzotriazole spacer has the best efficiency of 8.14%, which is comparable with that of an -based DSSC (8.03%). After coadsorbed with 1 mM CDCA, the efficiency was improved to 8.4%. The J-aggregation of the dye results in light harvesting at a longer wavelength spectral region and increasing the photocurrent of the cell.
authors.affiliation: Institute of Chemistry, Academia Sinica, Nankang 11529, Taipei, Taiwan. jtlin@gate.sinica.edu.tw.
authors.forename: Jen-Shyang
authors.initials: JS
authors.lastname: Ni
authors.affiliation: Department of Chemistry, National Central University, Chungli 32001, Taiwan.
authors.forename: Yi-Chi
authors.initials: YC
authors.lastname: Yen
authors.affiliation: Institute of Chemistry, Academia Sinica, Nankang 11529, Taipei, Taiwan. jtlin@gate.sinica.edu.tw and Department of Chemistry, National Central University, Chungli 32001, Taiwan.
authors.forename: Jiann T
authors.initials: JT
authors.lastname: Lin