East China University of Science and Technology has made important progress in the research area of ​​dye-sensitized solar cells

Professor Shi Yongshu of the School of Chemistry and Molecular Engineering of East Polytechnic University has made important progress in the research field of dye-sensitized solar cells (DSSCs). The latest research result is “Efficient Solar Cells Sensitized by Porphyrins with Extended Conjugation Framework and a Carbazole Donor: from Molecular Design to Cosensitization”. Published in the German Journal of Applied Chemistry (Angew. Chem. Int. Ed. 2014, link: http://dx.doi.org/10.1002/anie.201406190). The research work was completed by doctoral student Wang Yueqiang and others under the guidance of Professor Xi Yongshu.

Solar energy is a clean, efficient and abundant renewable energy source. An important way to use solar energy is to convert light energy into electricity. As an important member of the solar cell family, dye-sensitized solar cells have the advantages of high photoelectric conversion efficiency and simple manufacturing process, which has attracted widespread attention of experts.

Photoelectric conversion efficiency is an important parameter to measure the performance of a battery, and a sensitizer for capturing light energy plays a decisive role in battery efficiency. As a core component of nature photosynthesis centers, porphyrins have high molar absorption coefficients and structures that are easily modified by the system. They have special advantages in light energy capture and energy conversion, but they are evident in the near-infrared region and around 500 nm. Absorption defects.

In response to this problem, this study introduced an extra alkyne bond in the porphyrin molecule to expand the conjugated structure of the molecule, enhance dye absorption in the near-infrared region, and introduce an alkoxy chain on the phenyl group attached to the acetylene bond. To inhibit the intermolecular agglomeration effect caused by the introduction of acetylene bonds. In addition, a pure organic small molecule dye with an absorption peak around 500 nm and a large open circuit voltage was further designed and synthesized. As a co-sensitizer for porphyrin dyes, it effectively compensated for the absorption of porphyrin dyes at around 500 nm. defect. Through the above-mentioned comprehensive strategy of porphyrin dye structure optimization and co-sensitization, the short-circuit current and the open-circuit voltage of the battery can be increased at the same time, achieving a photoelectric conversion efficiency of up to 10.45%.

In addition, the porphyrin sensitizers developed in this paper all use the carbazole group as the electron donor, which breaks the limitations of the commonly used diphenylamine electron donors for the high-potency porphyrin dyes, and develops highly efficient porphyrin dyes containing different electron donors. , To further improve the efficiency of the battery provides a new idea.

The accomplishment of this research work has benefited from the long-term accumulation and solidarity and collaborative research atmosphere of the Tian Luan academician team in the field of dye-sensitized solar cells. It is a project of the National Natural Science Foundation of China, the Shanghai Oriental Scholars Distinguished Professor and the New Century Excellent Talents of the Ministry of Education. Completed under the funding of other projects.

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