| Autor: |
Hayashi, Hironobu, Touchy, Abeda Sultana, Kinjo, Yuriko, Kurotobi, Kei, Toude, Yuuki, Ito, Seigo, SaarENpää, Hanna, TkachENko, Nikolai V., LemmetyinEN, Helge, Imahori, Hiroshi |
| Zdroj: |
ChemSusChem; Mar2013, Vol. 6 Issue 3, p508-517, 10p |
| Abstrakt: |
We have prepared a push-pull porphyrin with an electron-donating triarylamino group at the β,β ′-edge through a fused imidazole group and an electron-withdrawing carboxyquinoxalino anchoring group at the opposite β,β ′-edge (ZnPQI) and evaluated the effects of the push-pull structure of ZnPQI on optical, electrochemical, and photovoltaic properties. ZnPQI showed red-shifted Soret and Q bands relative to a reference porphyrin with only an electron-withdrawing group (ZnPQ), thus demonstrating the improved light-harvesting property of ZnPQI. The optical HOMO-LUMO gap was consistent with that estimated by DFT calculations. The ZnPQI-sensitized solar cell exhibited a relatively high power conversion efficiency ( η) of 6.8 %, which is larger than that of the ZnPQ-sensitized solar cell ( η=6.3 %) under optimized conditions. The short-circuit current and fill factor of the ZnPQI-sensitized solar cell are larger than those of the ZnPQ-sensitized solar cell, whereas the open circuit potential of the ZnPQI-sensitized cell is smaller than that of the ZnPQ-sensitized cell, leading to an overall improved cell performance of ZnPQI. Such fundamental information provides a new tool for the rational molecular design of highly efficient dye-sensitized solar cells based on push-pull porphyrins. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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