Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 34, Pages 10008-10015Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta11870c
Keywords
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Funding
- WNLO
- 973 Program of China [2013CB922104, 2011CBA00703]
- NSFC [21103057, 21161160445, 20903030, 21173091]
- Natural Science Foundation of Hubei Province [2011CDB04]
- Fundamental Research Funds for the Central Universities [HUST: 2011TS021, 2011QN040, 2012YQ027]
- Program of New Century Excellent Talents in University [NCET-10-0416]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars
- CME
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In this study, new push-pull alkoxy-wrapped zinc porphyrin dyes with intramolecular donor-pi-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 (similar to 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 pi-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 pi-conjugated linkers and anchoring groups upon the optoelectronic features of porphyrin dyes in DSCs.
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