Chemical structure of ZnO nanorod array on a DSSC photoanode

Yu Hao Chang, Chang Yu Liao, H. Paul Wang, Yu Lin Wei, Tzung Fang Guo, Yi Fang Chiang

研究成果: Conference contribution

摘要

The main objective of the present work was to study speciation of ZnO nanorods during the photoexcited electron transfer between photosensitive dyes and the ZnO nanorod arrays on the photoanode of a dye-sensitized solar cell (DSSC) by X-ray absorption (near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS)) spectroscopy. The least-square component fitted XANES spectra show that the main zinc species in the ZnO-nanorod photoanode are nanosize ZnO (88%) and Zn(OH)2 (12%). An enhanced adsorption of the dyes N3 (C26H20O10N 6S2Ru) and mercurochrome (C20H 8Br2HgNa2O6) on the ZnO nanorods is found, of which 6-10% of the nanosize ZnO involve in the chemical interaction with the dyes. Their EXAFS spectra also indicate that the bond distance and coordination number of Zn-0 in the ZnO nanorods is 1.95 å (which is less than that in the ZnO seedlayer by 0.01 å) and in the range of 4.6-4.8, respectively. The efficiencies of the DSSCs containing the N3 and mercurochrome dispersed ZnO nanorods on the photoanodes are 0.33-0.92%. The relatively less Jsc (photocurrent density) of the DSSC with the N3-dispersed ZnO nanorod may be due to the formation of a N3-Zn2+ complex. A rapid recombination of the photoexcited electrons with I3- in the electrolyte of the DSSC containing the N3 dispersed ZnO nanorods is also found, which causes a reduction of its FF (fill factor) value.

原文English
主出版物標題Nanotechnology 2010
主出版物子標題Advanced Materials, CNTs, Particles, Films and Composites - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010
頁面685-688
頁數4
出版狀態Published - 2010 十一月 9
事件Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites - 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010 - Anaheim, CA, United States
持續時間: 2010 六月 212010 六月 24

出版系列

名字Nanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites - Technical Proceedings of the 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010
1

Other

OtherNanotechnology 2010: Advanced Materials, CNTs, Particles, Films and Composites - 2010 NSTI Nanotechnology Conference and Expo, NSTI-Nanotech 2010
國家/地區United States
城市Anaheim, CA
期間10-06-2110-06-24

All Science Journal Classification (ASJC) codes

  • 陶瓷和複合材料
  • 表面、塗料和薄膜
  • 表面和介面

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