標題: | Electroabsorption spectra of push-pull porphyrins in solution and in solid films |
作者: | Awasthi, Kamlesh Hsu, Hung-Yu Chiang, Hung-Chu Mai, Chi-Lun Yeh, Chen-Yu Diau, Eric Wei-Guang Ohta, Nobuhiro 應用化學系 應用化學系分子科學碩博班 Department of Applied Chemistry Institute of Molecular science |
關鍵字: | Stark shift;electric dipole moment;dye-sensitized solar cell;push-pull porphyrins |
公開日期: | 1-一月-2015 |
摘要: | Polarized electroabsorption (E-A) spectra of highly efficient porphyrin sensitizers (YD2 and YD2-oC8) have been measured in benzene solution. Polarized E-A spectra of these push-pull porphyrins embedded in poly(methyl methacrylate) films or sensitized on TiO2 films are also observed. Based on the analysis of the E-A spectra, the magnitude of the electric dipole moment both in the ground state and in the lowest excited state have been evaluated in solution and in solid films. The electric dipole moment in the excited state of these compounds is very large on TiO2 films, suggesting the interfacial charge transfer on TiO2 surface following photoexcitation of porphyrin dyes. The electric dipole moment in the excited state evaluated from the E-A spectra is very different from the one evaluated from the electrophotoluminescence spectra on TiO2, suggesting that the strong local field of TiO2 films is applied to the fluorescing dyes attached to TiO2 films. |
URI: | http://dx.doi.org/10.1142/S108842461550042X http://hdl.handle.net/11536/124733 |
ISSN: | 1088-4246 |
DOI: | 10.1142/S108842461550042X |
期刊: | JOURNAL OF PORPHYRINS AND PHTHALOCYANINES |
Volume: | 19 |
Issue: | 1-3 |
起始頁: | 527 |
結束頁: | 534 |
顯示於類別: | 期刊論文 |