Mechanism of squarylium cyanine and Ru(dcbpy)(2)(NCS)(2) co-sensitization of colloidal TiO2
文献类型：期刊论文
| 作者 | Zuo, Ping; Li, Chao; Wu, Yi-Shi; Ai, Xi-Cheng; Wang, Xue-Song; Zhang, Bao-Wen; Zhang, Jian-Ping |
| 刊名 | JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
 |
| 出版日期 | 2006-09-30 |
| 卷号 | 183期号:1-2页码:138-145 |
| 关键词 | Dye-sensitized Semiconductor Solar Cell (Dssc) Squarylium Cyanine N3 Tio2 Time-resolved Spectroscopy |
| ISSN号 | 1010-6030 |
| DOI | 10.1016/j.jphotochem.2006.03.007 |
| 英文摘要 | We have investigated the mechanism of squarylium cyanine (SQC) and Ru(dcbpy)(2)(NCS)(2) (N3) co-sensitization of colloidal TiO2 by means of time-resolved spectroscopies. Picosecond time-resolved fluorescence measurements combined with solvent-effect tests revealed a planar and a twisted conformer of the lowest singlet-excited state SQC ((1)SQC*). Quenching of (1)SQC* fluorescence by adsorption on TiO2 and further by co-adsorption with N3 was observed, which are ascribed to the (1)SQC*-to-TiO2 and (1)SQC*-to-N3(center dot+) electron transfer (ET) reactions based on femtosecond time-resolved absorption results. The planar and the twisted (1)SQC* conformers are able to inject electrons into the conduction band of TiO2 with the rates of 1/2.76 ns(-1) and 1/0.30 ns(-1), and to reduce N3(center dot+) with the rates of 1/2.56 ns(-1) and 1/0.28 ns(-1), respectively. The latter pair of rates are significantly larger than those of the TiO2(e(-))-to-N3(center dot+) back electron transfer (BET) reactions. In addition, ground state SQC is also found to be able to efficiently reduce N3(center dot+) with a rate constant of 1/0.32 ns(-1). These results imply that minor amount of SQC as a co-adsorbate can effectively intercept the TiO2(e(-))-to-N3(center dot+) BET, a mechanism which accounts for the improvement of light-to-electricity conversion efficiency of dye-sensitized solar cells through N3 and SQC co-sensitization (D. Zhang et al., J. Photochem. Photobiol. A: Chem. 135 (2000) 235). (c) 2006 Elsevier B.V. All rights reserved. |
| 语种 | 英语 |
| WOS记录号 | WOS:000240577000019 |
| 出版者 | ELSEVIER SCIENCE SA |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/59949]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Ai, Xi-Cheng |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100101, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zuo, Ping,Li, Chao,Wu, Yi-Shi,et al. Mechanism of squarylium cyanine and Ru(dcbpy)(2)(NCS)(2) co-sensitization of colloidal TiO2[J]. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,2006,183(1-2):138-145. |
| APA | Zuo, Ping.,Li, Chao.,Wu, Yi-Shi.,Ai, Xi-Cheng.,Wang, Xue-Song.,...&Zhang, Jian-Ping.(2006).Mechanism of squarylium cyanine and Ru(dcbpy)(2)(NCS)(2) co-sensitization of colloidal TiO2.JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY,183(1-2),138-145. |
| MLA | Zuo, Ping,et al."Mechanism of squarylium cyanine and Ru(dcbpy)(2)(NCS)(2) co-sensitization of colloidal TiO2".JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY 183.1-2(2006):138-145. |
入库方式： OAI收割
来源：化学研究所
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