Dual-channel anchorable organic dye with triphenylamine-based core bridge unit for dye-sensitized solar cells

• Published in: Dyes and pigments Vol. 99; no. 3; pp. 599 - 606
• Main Authors: Seo, Kang Deuk, You, Ban Seok, Choi, In Tack, Ju, Myung Jong, You, Mi, Kang, Hong Seok, Kim, Hwan Kyu
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2013
• Subjects: Bridges (structures); Channels; Coadsorbent; Conversion; Core bridge donor; Direct current; Dual-channel; Dye aggregation; Dye-sensitized solar cell; Dyes; Photovoltaic cells; Solar cells; Titanium dioxide; Triphenylamine; Dye-sensitized solar cell; Coadsorbent; Dye aggregation; Dual-channel; Core bridge donor; Triphenylamine
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2013.06.014

Dual-channel (DC) anchorable organic dye based on an acceptor–π–donor-core bridge donor–donor–π-acceptor structural motif, was synthesized and used as sensitizer for dye sensitized solar cells (DSSCs). DC dye linked the two donors using a core bridge donor such as triphenylamine unit, which makes two channels maintaining a particular distance (>4 Å). The inter-planar DC5 exhibited dye aggregation and charge recombination due to strongly intermolecular π–π stacking between the channels of DC dyes adsorbed on the TiO2 surface. As a result, a solar cell based on DC5 with a hole conductor coadsorbent of HC-A1 showed better photovoltaic performance with a Jsc of 8.90 mA cm−2, a Voc of 0.70 V, and an FF of 0.77, corresponding to an overall conversion efficiency (η) of 4.80%.
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•Dual-channel anchorable dye was synthesized and used as sensitizer for DSSCs.•DC dye linked to the two donors using a core bridge donor of triphenylamine unit.•The inter-planar DC5 exhibited dye aggregation and charge recombination.•The aggregation between channels of dye was reduced by coadsorbents.•DC5-DSSCs with coadsorbents decreased the charge recombination.