Phenyl-conjugated oligoene sensitizers for TiO2 solar cells
Phenyl-conjugated oligoene sensitizers for TiO2 solar cells
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DOI：
10.1021/cm0349708
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发表时间：
2004-05-04
影响因子：
8.6
通讯作者：
Yanagida, S
中科院分区：
文献类型：
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作者：
Kitamura, T;Ikeda, M;Yanagida, S
设计并合成了一系列以不同长度的亚甲基、氰基和/或羧基为电子受体单元，氨基为电子供体单元的新型低聚烯染料，作为染料敏化太阳能电池的高效有机增感剂。吸收光谱的红移是通过增加甲基单元的数目和引入吸电子和接受电子基团来扩展pi共轭体系而实现的，这导致了电荷转移型吸收特性。染料的氧化还原电位也受取代官能团的控制。基于低聚烯染料的染料敏化太阳能电池(DSCs)表现出良好的入射光子对电流转换效率的响应(~gt；80%)，使得在1个太阳照射条件下的光伏性能高达6.6%。飞秒瞬时吸收光谱分析。中红外光谱区显示了从低聚烯类染料的激发态到二氧化钛导带的快速电子注入。寡烯染料的分子设计为开发用于染料敏化太阳能电池的新型有机增感剂提供了可靠的依据。
As highly efficient organic sensitizers for dye-sensitized solar cells, a series of novel oligoene dyes which have different lengths of methine units, cyano groups and/or carboxylic groups as the electron acceptor units, and amino groups as the electron donor units was designed and synthesized. The bathochromic shift of the absorption spectrum was achieved by expansion of the pi-conjugated system by increasing the number of methine units and by introduction of both electron-withdrawing and -accepting groups, which induced chargetransfer-type absorption character. Redox potential of the dyes was also controlled by the substitution of the functional groups. Dye-sensitized solar cells (DSCs) based on the oligoene dyes showed excellent response of incident photon to current conversion efficiency (>80%), leading to good photovoltaic performances up to 6.6% under 1 sun irradiation conditions. Femtosecond transient absorption spectroscopy in. the mid-IR region revealed the very fast electron injection from the excited states of the oligoene dyes to the conduction band of TiO2. The molecular design of oligoene dye is reliable for developing novel organic sensitizers for use in dye-sensitized solar cells.