A new heteroleptic ruthenium sensitizer enhances the absorptivity of mesoporous titania film for a high efficiency dye-sensitized solar cell.

CHEMICAL COMMUNICATIONS, pp.2635-2637, (2008)

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摘要

A heteroleptic polypyridyl ruthenium complex, cis-Ru(4,4'-bis(5-octylthieno[3,2-b]thiophen-2-yl)-2,2'-bipyridine)(4,4'-dicarboxyl-2,2'-bipyridine)(NCS) 2, with a high molar extinction coefficient of 20.5 x 10(3) M(-1) cm(-1) at 553 nm has been synthesized and demonstrated as a highly efficient sensitizer for a dye-sensitized solar cell, g...更多

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简介
  • COMMUNICATION Peng Wang et al A new heteroleptic ruthenium sensitizer enhances the absorptivity of mesoporous titania film for a high efficiency dye-sensitized solar cell.
  • A new heteroleptic ruthenium sensitizer enhances the absorptivity of mesoporous titania film for a high efficiency dye-sensitized solar cellw
重点内容
  • A new heteroleptic ruthenium sensitizer enhances the absorptivity of mesoporous titania film for a high efficiency dye-sensitized solar cellw
  • While an impressive device efficiency has been reached with a metal-free organic dye possessing a very high molar extinction coefficient,[2] it is fair to note that the dyesensitized solar cell1 (DSC) efficiency record of B11.1%3 measured under the irradiance of AM 1.5G sunlight is held by the well-known N719 or black dye in combination with a thick mesoscopic titania film
  • Chen et al.8c reported a noteworthy sensitizer with a high molar extinction coefficient of 21.2 Â 103 MÀ1 cmÀ1, showing a power conversion efficiency of 8.54%
  • As presented in the Electronic Supplementary Information (ESI), we detailed the origins of these transitions by calculating the electronic states of C104 with the time-dependent density functional theory (TDDFT).w The impressive improvement of extending the p conjugated system of the ancillary ligands in heteroleptic ruthenium complexes such as C104 is apparent from Fig. 2B, which depicts the absorption spectra in the visible region of Z907Na, N719 and C104 a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, China
  • The shortening of the light absorption length of mesoporous titania film endowed by the C104 sensitizer is highly desirable to achieve a good charge collection yield for a high efficiency DSC
结果
  • Received 19th February 2008, Accepted 12th March 2008 First published as an Advance Article on the web 4th April 2008 DOI: 10.1039/b802909a
  • A heteroleptic polypyridyl ruthenium complex, cis-Ru(4,40bis(5-octylthieno[3,2-b]thiophen-2-yl)-2,20-bipyridine)(4,40-dicarboxyl-2,20-bipyridine)(NCS)[2], with a high molar extinction coefficient of 20.5 Â 103 MÀ1 cmÀ1 at 553 nm has been synthesized and demonstrated as a highly efficient sensitizer for a dye-sensitized solar cell, giving a power conversion efficiency of 10.53% measured under an irradiation of air mass 1.5 global (AM 1.5G) full sunlight.
  • While an impressive device efficiency has been reached with a metal-free organic dye possessing a very high molar extinction coefficient,[2] it is fair to note that the DSC efficiency record of B11.1%3 measured under the irradiance of AM 1.5G sunlight is held by the well-known N719 or black dye in combination with a thick mesoscopic titania film.
  • In 2003, a thermally stable, B7% efficiency DSC4 was disclosed employing the amphiphilic Z907 sensitizer.[5] the molar extinction coefficient of this sensitizer is somewhat lower than that of the standard N719 dye.
  • Chen et al.8c reported a noteworthy sensitizer with a high molar extinction coefficient of 21.2 Â 103 MÀ1 cmÀ1, showing a power conversion efficiency of 8.54%.
  • The measured peak molar extinction coefficient (e) is 20.5 Â 103 MÀ1 cmÀ1, which is very close to the calculated value and significantly higher than the corresponding values for the standard Z907 (12.2 Â 103 MÀ1 cmÀ1) and N719 (14.0 Â 103 MÀ1 cmÀ1) sensitizers.[9,10] As presented in the Electronic Supplementary Information (ESI), the authors detailed the origins of these transitions by calculating the electronic states of C104 with the time-dependent density functional theory (TDDFT).w The impressive improvement of extending the p conjugated system of the ancillary ligands in heteroleptic ruthenium complexes such as C104 is apparent from Fig. 2B, which depicts the absorption spectra in the visible region of Z907Na, N719 and C104 a State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun, China.
结论
  • The shortening of the light absorption length of mesoporous titania film endowed by the C104 sensitizer is highly desirable to achieve a good charge collection yield for a high efficiency DSC.
  • The authors have developed a novel heteroleptic ruthenium sensitizer with a high molar extinction coefficient to considerably enhance the optical absorptivity of mesoporous titania film.
基金
  • This work is supported by the National Key Scientific Program-Nanoscience and Nanotechnology (No 2007CB936700) and the ‘‘100-Talent Program’’ of the Chinese Academy of Sciences
  • M.W., R.H.-B., S.M.Z. and M.G. thank the Swiss National Science Foundation for financial support
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