Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/33824
標題: Novel Zinc Porphyrin Sensitizers for Dye-Sensitized Solar Cells: Synthesis and Spectral, Electrochemical, and Photovoltaic Properties
作者: Lee, Cheng-Wei
Lu, Hsueh-Pei
Lan, Chi-Ming
Huang, Yi-Lin
Liang, You-Ren
Yen, Wei-Nan
Liu, Yen-Chun
Lin, You-Shiang
Diau, Eric Wei-Guang
Yeh, Chen-Yu
關鍵字: cross-coupling
donor-acceptor systems
electrochemistry
porphyrinoids
solar cells
nanocrystalline tio2 films
conjugated organic-dyes
energy conversion
efficiency
nonlinear-optical properties
electron-transfer
adsorbing
groups
coumarin dyes
light
chromophor
摘要: Novel meso- or beta-derivatized porphyrins with a carboxyl group have been designed and synthesized for use as sensitizers in dye-sensitized solar cells (DSSCs). The position and nature of a bridge connecting the porphyrin ring and carboxylic acid group show significant influences on the spectral, electrochemical, and photovoltaic properties of these sensitizers. Absorption spectra of porphyrins with a phenylethynyl bridge show that both Soret and Q bands are red-shifted with respect to those of porphyrin 6. This phenomenon is more pronounced for porphyrins 3 and 4, which have a pi-conjugated electron-donating group at the meso position opposite the anchoring group. Upon introduction of an ethynylene group at the meso position, the potential at the first oxidation alters only slightly whereas that for the first reduction is significantly shifted to the positive, thus indicating a decreased HOMO-LUMO gap. Quantum-chemical (DFT) results support the spectroelectrochemical data for a delocalization of charge between the porphyrin ring and the amino group in the first oxidative state of diarylamino-substituted porphyrin 5, which exhibits the best photovoltaic performance among all the porphyrins under investigation. From a comparison of the cell performance based on the same TiO(2) films, the devices made of porphyrin 5 coadsorbed with chenodeoxycholic acid (CDCA) on TiO(2) in ratios [5]/[CD-CA]=1:1 and 1:2 have efficiencies of power conversion similar to that of an N3-based DSSC, which makes this green dye a promising candidate for colorful DSSC applications.
URI: http://hdl.handle.net/11455/33824
ISSN: 0947-6539
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