American Chemical Society
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Porphyrin Sensitizers Bearing a Pyridine-Type Anchoring Group for Dye-Sensitized Solar Cells

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journal contribution
posted on 2015-07-15, 00:00 authored by Chi-Lun Mai, Thomas Moehl, Chi-Hung Hsieh, Jean-David Décoppet, Shaik M. Zakeeruddin, Michael Grätzel, Chen-Yu Yeh
Three novel efficient donor–acceptor porphyrins, MH1–MH3, with a pyridine-type acceptor and anchoring group were synthesized and their optical, electrochemical, and photovoltaic properties investigated. Replacing the commonly used 4-carboxyphenyl anchoring group with 2-carboxypyridine, 2-pyridone, and pyridine did not significantly change the absorption and electrochemical properties of the porphyrin dyes. These new porphyrin dyes MH show power conversion efficiencies of 8.3%, 8.5%, and 8.2%, which are comparable to that of the benchmark YD2-o-C8 (η = 8.25%) under similar conditions. It was demonstrated that 2-carboxypyridine is an efficient and stable anchoring group as MH1 and showed better cell performance and long-term stability than YD2-o-C8 under light soaking conditions.