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Photosensitization of nanocrystalline TiO2 electrodes with II B group metal-ion-bridged self-assembled films of 3,4,9,10-perylenetetracarboxylic acid |
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| Authors: | Zhong-Sheng Wang Chun-Hui Huang Fu-You Li Shi-Fu Weng Shu-Ming Yang |
| Affiliation: | a State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University–The University of Hong Kong Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, PR China b College of Science, Shandong Agricultural University, Tai’an, Shandong 271018, PR China |
| Abstract: | Self-assembled films (SA films) of 3,4,9,10-perylenetetracarboxylic acid (PTA) (Film P) and II B group metal-ion-bridged PTA (Film PMP, M=Zn2+, Cd2+, or Hg2+) were fabricated on nanocrystalline TiO2 electrodes and characterized with UV–VIS and IR spectra and XPS. Compared with Film P sensitized solar cell, Grätzel cells based on individual PMP electrodes are more efficient regarding photocurrent generation. Synchrotron radiation photoelectron spectroscopy (SRPES) study reveals that those HOMO energy levels of PMP films are greater than that of Film P. The higher HOMO energy levels will lead to higher excited state energy levels that benefit electron injection, and hence, increase efficiencies for photocurrent generation. In view of the invariable valence of Zn2+, Cd2+, and Hg2+ ions, electron injection should be attributed to ligand, but not to the central metal ions, like the case of Ru(II)–bipyridyl complex. |
| Keywords: | 3,4,9,10-Perylenetetracarboxylic acid HOMO energy Ligand |
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