Oligophenylenevinylene-functionalized Ru(II)-bipyridine sensitizers for efficient dye-sensitized nanocrystalline TiO2 solar cells

被引:94
作者
Jang, Song-Rim
Lee, Chongchan
Choi, Hyunbong
Ko, Jae Jung [1 ]
Lee, Jiwon
Vittal, R.
Kim, Kang-Jin
机构
[1] Korea Univ, Div Chem & Mol Engn, Seoul 136713, South Korea
[2] Korea Univ, Dept New Mat Chem, Jochiwon 339700, South Korea
[3] Samsung SDI Co Ltd, Gyeonggi 449577, South Korea
关键词
D O I
10.1021/cm061447v
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
New 4- and 4,4'-oligophenylenevinylene- functionalized Ru( II)- bipyridine sensitizers were synthesized and used in dye- sensitized TiO2 solar cells ( DSSCs) to study their sensitizing properties relative to those of the usual N3 dye. Among those studied, two sensitizers, denoted as D5 and D6, have rendered considerably higher photocurrents and efficiencies for their cells, compared to those of a cell using the conventional N3 dye. The short- circuit photocurrent densities for N3, D5, and D6 are 9.8, 10.8, and 11.7 mA/ cm2, and the efficiencies are 4.1, 4.6, and 4.8%, respectively. The enhanced photocurrents are correlated with the increased molar absorption coefficients of the D5 and D6 dyes over the entire visible spectra region, relative to those of the N3 dye. Corresponding enhancements in IPCE values are attributed to the oligophenylenevinylene groups of D5 and D6 that consist of conjugated double bonds. Analysis of the absorption spectra of the sensitizer-coated TiO2 films and the desorbed dyes in an aqueous KOH solution indicates that D5 and D6 adhere more strongly to TiO2 particles than the N3 dye, which is beneficial from the viewpoint of the long- term stability of the DSSCs.
引用
收藏
页码:5604 / 5608
页数:5
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