1-Alkyl-1H-imidazole-Based Dipolar Organic Compounds for Dye-Sensitized Solar Cells

被引：79

作者：

Velusamy, Marappan ^{[1
]}

Hsu, Ying-Chan ^{[1
]}

Lin, Jiann T. ^{[1
]}

Chang, Che-Wei ^{[1
]}

Hsu, Chao-Ping ^{[1
]}

机构：

[1] Acad Sinica, Inst Chem, Taipei, Taiwan

来源：

CHEMISTRY-AN ASIAN JOURNAL | 2010年 / 5卷 / 01期

关键词：

charge transfer; donor-acceptor systems; dyes; photophysics; sensitizers; NONLINEAR-OPTICAL POLARIZABILITIES; NANOCRYSTALLINE TIO2 FILMS; HIGH-EFFICIENCY; COUMARIN DYES; ENERGY-CONVERSION; EXCITED-STATES; LIGHT; CONJUGATION; PERFORMANCE; COMPLEXES;

D O I：

10.1002/asia.200900244

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A series of donor-pi-acceptor-type organic dyes based on 1-alkyl-1H-imidazole spacers 1-5 have been developed and characterized. The two electron donors are at positions 4 and 5 of the imidazole, while the electron-accepting cyanoacrylic acid is incorporated at position 2 by a spacer-containing heteroaromatic rings, such as thiophene and thiazole. Detailed investigation on the relationship between the structure, spectral and electrochemical properties, and performance of DSSC is described here. Dye-sensitized solar cells (DSSCs) using dyes as the sensitizers exhibit good efficiencies, ranging from 3.06 to 6.35 %, which reached 42-87 % with respect to that of N719-based device (7.33%) fabricated and measured under similar conditions. Time-dependent density functional theory (TDDFT) calculations have been performed on the dyes, and the results show that both electron donors can contribute to electron injection upon photo-excitation, either directly or indirectly by internal conversion to the lowest excited state.

引用

页码：87 / 96

页数：10