https://scholars.lib.ntu.edu.tw/handle/123456789/371814
標題: | Dye molecular structure device open-circuit voltage correlation in Ru(II) sensitizers with heteroleptic tridentate chelates for dye-sensitized solar cells | 作者: | PI-TAI CHOU | 公開日期: | 2012 | 卷: | 134 | 期: | 17 | 起(迄)頁: | 7488-7496 | 來源出版物: | Journal of the American Chemical Society | 摘要: | Dicarboxyterpyridine chelates with π-conjugated pendant groups attached at the 5- or 6-position of the terminal pyridyl unit were synthesized. Together with 2,6-bis(5-pyrazolyl)pyridine, these were used successfully to prepare a series of novel heteroleptic, bis-tridentate Ru(II) sensitizers, denoted as TF-11-14. These dyes show excellent performance in dye-sensitized solar cells (DSCs) under AM1.5G simulated sunlight at a light intensity of 100 mW cm -2 in comparison with a reference device containing [Ru(Htctpy)(NCS) 3][TBA] 3 (N749), where H 3tctpy and TBA are 4,4′,4″-tricarboxy-2,2′:6′,2″- terpyridine and tetra-n-butylammonium cation, respectively. In particular, the sensitizer TF-12 gave a short-circuit photocurrent of 19.0 mA cm -2, an open-circuit voltage (V OC) of 0.71 V, and a fill factor of 0.68, affording an overall conversion efficiency of 9.21%. The increased conjugation conferred to the TF dyes by the addition of the π-conjugated pendant groups increases both their light-harvesting and photovoltaic energy conversion capability in comparison with N749. Detailed recombination processes in these devices were probed by various spectroscopic and dynamics measurements, and a clear correlation between the device V OC and the cell electron lifetime was established. In agreement with several other recent studies, the results demonstrate that high efficiencies can also be achieved with Ru(II) sensitizers that do not contain thiocyanate ancillaries. This bis-tridentate, dual-carboxy anchor configuration thus serves as a prototype for future omnibearing design of highly efficient Ru(II) sensitizers suited for use in DSCs. © 2012 American Chemical Society. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84860817069&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/371814 |
DOI: | 10.1021/ja300828f | SDG/關鍵字: | Dye-Sensitized solar cell; Electron lifetime; Excellent performance; Fill factor; Heteroleptic; Light intensity; Light-harvesting; Overall conversion efficiency; Pendant groups; Photovoltaic energy conversion; Pyridyl; Recombination process; Reference devices; Short-circuit photocurrent; Simulated sunlight; Terpyridines; Chelation; Conversion efficiency; Open circuit voltage; Photoelectrochemical cells; Solar cells; Ruthenium alloys; chelate; ruthenium derivative; tf 11; tf 12; tf 13; tf 14; tricarboxyterpyridine ruthenium sensitizer; unclassified drug; article; cell type; chemical structure; conjugation; dye sensitized solar cell; electric potential; energy conversion; light harvesting system; light intensity; simulation; sunlight; synthesis |
顯示於: | 化學系 |
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