Triplication of the Photocurrent in Dye Solar Cells by Increasing the Elongation of the π-conjugation in Zn-Porphyrin Sensitizers

被引:33
作者
Barea, Eva M. [1 ]
Caballero, Ruben [2 ]
Lopez-Arroyo, Leticia [2 ]
Guerrero, Antonio [1 ]
de la Cruz, Pilar [2 ]
Langa, Fernando [2 ]
Bisquert, Juan [1 ]
机构
[1] Univ Jaume 1, Photovolta & Optoelect Devices Grp, Dept Phys, Castellon de La Plana 12071, Spain
[2] Univ Castilla La Mancha, Inst Nanociencia Nanotecnol & Mat Mol INAMOL, Toledo 45071, Spain
关键词
dye-sensitized solar cells; dyes/pigments; porphyrinoids; UV/Vis spectroscopy; zinc; EFFICIENCY;
D O I
10.1002/cphc.201000958
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Porphyrins are promising sensitizers for dye solar cells (DSCs) but narrow absorption bands at 400-450 and 500-650 nm limit their light-harvesting properties. Increasing elongation of the p-conjugation and loss of symmetry causes broadening and a red-shift of the absorption bands, which considerably improves the performance of the DSC. Herein we use an oligothienylenevinylene to bridge a Zn-porphyrin system and the anchoring group of the sensitizer. We separately study the performance of the two basic units: oligothienylenevinylene and Zn-porphyrin. The combined system provides a three-fold enhancement of the photocurrent with respect to parent dyes. This is caused by an additional strong absorption in the region 400-650 nm that leads to flat IPCE of 60 %. Theoretical calculations support that the addition of the oligothienylenevinylene unit as a linking bridge creates a charge transfer band that transforms a Zn-porphyrin dye into a push-pull type system with highly efficient charge injection properties.
引用
收藏
页码:961 / 965
页数:5
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