標題: | Synthesis and characterization of porphyrin sensitizers with various electron-donating substituents for highly efficient dye-sensitized solar cells |
作者: | Hsieh, Chou-Pou Lu, Hsueh-Pei Chiu, Chien-Lan Lee, Cheng-Wei Chuang, Shu-Han Mai, Chi-Lun Yen, Wei-Nan Hsu, Shun-Ju Diau, Eric Wei-Guang Yeh, Chen-Yu 應用化學系 Department of Applied Chemistry |
公開日期: | 2010 |
摘要: | A series of porphyrin dyes with an electron-donating group (EDG) attached at a meso-position (YD1-YD8) have been designed and synthesized for use as sensitizers in dye-sensitized solar cells (DSSC). The nature of the EDG exerts a significant influence on the spectral, electrochemical and photovoltaic properties of these sensitizers. Absorption spectra of porphyrins having an amino group show broadened Soret band and red-shifted Q bands with respect to those of reference porphyrin YD0. This phenomenon is more pronounced for porphyrins YD7 and YD8 that have a pi-conjugated triphenylamine at the meso-position opposite the anchoring group. Upon introduction of an EDG at the meso-position, the potential for the first oxidation alters significantly to the negative whereas that for the first reduction changes inappreciably, indicating a decreased HOMO-LUMO gap. Results of density-functional theory (DFT) calculations 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 porphyrins YD1-YD4, which exhibit superior photovoltaic performance among all porphyrins under investigation. With long-chain alkyl groups on the diarylamino substituent, YD2 shows the best cell performance with J(SC) = 13.4 mA cm(-2), V(OC) = 0.71 V, and FF = 0.69, giving an overall efficiency 6.6% of power conversion under simulated one-sun AM1.5 illumination. |
URI: | http://hdl.handle.net/11536/6147 http://dx.doi.org/10.1039/b919645e |
ISSN: | 0959-9428 |
DOI: | 10.1039/b919645e |
期刊: | JOURNAL OF MATERIALS CHEMISTRY |
Volume: | 20 |
Issue: | 6 |
起始頁: | 1127 |
結束頁: | 1134 |
顯示於類別: | 期刊論文 |