title: Triarylamine-substituted imidazole- and quinoxaline-fused push-pull porphyrins for dye-sensitized solar cells.
abstract: 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.
authors: Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
authors: Hironobu
authors: H
authors: Hayashi
authors: Abeda Sultana
authors: AS
authors: Touchy
authors: Yuriko
authors: Y
authors: Kinjo
authors: Kei
authors: K
authors: Kurotobi
authors: Yuuki
authors: Y
authors: Toude
authors: Seigo
authors: S
authors: Ito
authors: Hanna
authors: H
authors: Saarenpää
authors: Nikolai V
authors: NV
authors: Tkachenko
authors: Helge
authors: H
authors: Lemmetyinen
authors: Hiroshi
authors: H
authors: Imahori
mesh_terms: D000588:Amines / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D011211:Electric Power Supplies; D004563:Electrochemistry; D007093:Imidazoles / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D055620:Optical Phenomena; D011166:Porphyrins / Q000737:chemistry*; D011810:Quinoxalines / Q000737:chemistry*; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry
chemical_list: D000588:Amines; D004396:Coloring Agents; D007093:Imidazoles; D011166:Porphyrins; D011810:Quinoxalines; C009495:titanium dioxide; D014025:Titanium