Title of Paper:Efficient Organic Sensitizers with Pyridine-N-oxide as an Anchor Group for Dye-Sensitized Solar Cells

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Date of Publication:2014-09-01

Journal:CHEMSUSCHEM

Included Journals:SCIE、EI、PubMed、Scopus

Volume:7

Issue:9

Page Number:2640-2646

ISSN No.:1864-5631

Key Words:dyes/pigments; electrochemistry; photochemistry; sensitizers; structure-activity relationships

Abstract:Five organic dyes with pyridine-N-oxide as the anchor group and electron acceptor have been synthesized and applied in dye-sensitized solar cells (DSSCs). Benzothiadiazole was introduced in the conjugation system to increase the electron withdrawing properties, FTIR spectra showed that the coordination was between the pyridine-N-oxide and the Bronsted acid site on the TiO2 surface. The relationship between different dye structures and the performance of the DSSCs was investigated systematically. The location of the thiophene unit was studied, and the direct linkage of benzothiadiazole with pyridine-Noxide was beneficial to broaden the absorption. The donor-acceptor-acceptor-configured dye WL307, which has 2-ethylhexyloxy chains in the donor part, showed the best efficiency of 6.08% under 100 mWcm(-2) light illumination. The dye series showed a fairly good stability during the one month test period.