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| Modulation of photovoltaic behavior of dye-sensitized solar cells by electron donors of porphyrin dyes and cosensitization |
| Bin Chena, Lu Sunb, Yong-Shu Xiea |
a Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai 200237, China;
b Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, Stockholm SE-10691, Sweden |
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| Guide The photovoltaic behavior can be rationally modulated by introduction of various electron donors into the porphyrin framework as well as cosensitization. The power conversion effi ciency of 5.75% can be achieved for the dye-sensitized solar cells |
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Abstract Porphyrin dyes have received great attention due to their excellent photovoltaic performance in dyesensitized solar cells (DSSCs). In this work, dyes XC1-XC3 were synthesized by introducing various numbers of bis(4-methoxyphenyl)amino and p-hexyloxyphenyl groups to porphyrin meso-positions. The XC1 molecule contains two p-hexyloxyphenyl groups, and its DSSCs showed the power conversion efficiency of 4.81%. For XC2 and XC3, the replacement of p-hexyloxyphenyl with diphenylamino groups can effectively enhance the light harvesting around 500 nm. However, the highest occupied molecular orbitals (HOMOs) were elevated too much, which suppressed the dye regeneration processes, leading to low cell efficiencies of 2.51% and 1.27% for XC2, and XC3, respectively. To further improve the cell performance, an anthracene derivative C1 was used as the cosensitizer for XC1, which increased both the Jsc and Voc values, with an improved efficiency of 5.75%.
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Received: 15 January 2015
Published: 18 April 2015
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| Fund: This work was financially supported by NSFC/China (Nos. 21472047 and 91227201), the Oriental Scholarship, and NCET-11-0638. |
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Corresponding Authors:
Yong-Shu Xie
E-mail: yshxie@ecust.edu.cn
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