2012年4月
Natural Chlorophyll-Related Porphyrins and Chlorins for Dye-Sensitized Solar Cells
MOLECULES
- ,
- 巻
- 17
- 号
- 4
- 開始ページ
- 4484
- 終了ページ
- 4497
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.3390/molecules17044484
- 出版者・発行元
- MDPI AG
Natural-chlorophyll-related porphyrins, including (2H, Zn, Cu)-protoporphyrin IX (Por-1) and Zn-mesoporphyrin IX (Por-2), and chlorins, including chlorin e(6) (Chl-1), chlorin e(4) (Chl-2), and rhodin G(7) (Chl-3), have been used in dye-sensitized solar cells (DSSCs). For porphyrin sensitizers that have vinyl groups at the beta-positions, zinc coordinated Por-1 gives the highest solar-energy-to-electricity conversion efficiency (eta) of up to 2.9%. Replacing the vinyl groups of ZnPor-1 with ethyl groups increases the open-circuit voltage (V-oc) from 0.61 V to 0.66 V, but decreases the short-circuit current (J(sc)) from 7.0 mA.cm(-2) to 6.1 mA.cm(-2) and the value of eta to 2.8%. Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations suggest that the higher J(sc) values of Zn-based porphyrin sensitizers result from the favorable electron injection from the LUMO at higher energy levels. In the case of the chlorin sensitizers, the number of carboxyl protons has a large effect on the photovoltaic performance. Chl-2 with two carboxyl protons gives much higher values of J(sc), V-oc, and eta than does Chl-1 with three carboxyl protons. Replacing the protons of Chl-1 with sodium ions can substantially improve the photovoltaic performance of Chl-1-based solar cells. Furthermore, the sodium salt of Chl-3 with an aldehyde group at the C7 position shows poorer photovoltaic performance than does the sodium salt of Chl-1 with methyl groups at the C7 position. This is due to the low light-harvesting capability of Chl-3.
- リンク情報
- ID情報
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- DOI : 10.3390/molecules17044484
- ISSN : 1420-3049
- Web of Science ID : WOS:000303309900061