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Issue 34, 2013
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D–π–A structured porphyrins for efficient dye-sensitized solar cells

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In this study, new push–pull alkoxy-wrapped zinc porphyrin dyes with intramolecular donor–π–acceptor structures have been designed and synthesized for dye-sensitized solar cells (DSCs). The linkers based on thiophene or 2,3-dihydrothieno[3,4-b][1,4] dioxine with cyanoacetic acid can broaden the spectral response of porphyrins into the near-IR region (∼850 nm), which is mainly attributed to the cyanoacetic acid group. However, porphyrins with cyanoacrylic acid as an anchoring group lead to a faster charge recombination rate at the dye-sensitized heterojunction interface, which lowers the device photovoltaic performance. By using porphyrins with a rigid π-linker feature structure that is 5-ethynylthiophene-2-carboxylic acid, highly efficient DSC devices with a power conversion efficiency of 9.5% can be obtained. Spectral, electrochemical, photovoltage transient decay and impedance measurements are performed to reveal the influence of π-conjugated linkers and anchoring groups upon the optoelectronic features of porphyrin dyes in DSCs.

Graphical abstract: D–π–A structured porphyrins for efficient dye-sensitized solar cells

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The article was received on 12 May 2013, accepted on 18 Jun 2013 and first published on 20 Jun 2013

Article type: Paper
DOI: 10.1039/C3TA11870C
Citation: J. Mater. Chem. A, 2013,1, 10008-10015

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    D–π–A structured porphyrins for efficient dye-sensitized solar cells

    J. Lu, X. Xu, K. Cao, J. Cui, Y. Zhang, Y. Shen, X. Shi, L. Liao, Y. Cheng and M. Wang, J. Mater. Chem. A, 2013, 1, 10008
    DOI: 10.1039/C3TA11870C

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