Hara Kohjiro, Wang Zhong-Sheng, Sato Tadatake, Furube Akihiro, Katoh Ryuzi, Sugihara Hideki, Dan-Oh Yasufumi, Kasada Chiaki, Shinpo Akira, Suga Sadaharu
National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
J Phys Chem B. 2005 Aug 18;109(32):15476-82. doi: 10.1021/jp0518557.
We have developed oligothiophene-containing coumarin dyes fully functionalized for dye-sensitized nanocrystalline TiO(2) solar cells (DSSCs). DSSCs based on the dyes gave good performance in terms of incident photon-to-current conversion efficiency (IPCE) in the range of 400-800 nm. A solar energy-to-electricity conversion efficiency (eta) of 7.4% was obtained with a DSSC based on 2-cyano-3-[5'-(1,1,6,6-tetramethyl-10-oxo-2,3,5,6-tetrahydro-1H,4H,10H-11-oxa-3a-aza-benzo[de]anthracen-9-yl)-[2,2']bithiophenyl-5-yl]acrylic acid (NKX-2677) under simulated AM 1.5G irradiation (100 mW cm(-2)) with a mask: short-circuit current density (J(sc)) = 13.5 mA cm(-2); open-circuit voltage (V(oc)) = 0.71 V; fill factor (FF) = 0.77. Transient absorption spectroscopy measurements indicated that electron injection from NKX-2677 to the conduction band of TiO(2) is very rapid (<100 fs), which is much faster than the emission lifetime of the dye (1.0 ns), giving a highly efficient electron injection yield of near unity.
我们已开发出用于染料敏化纳米晶TiO₂太阳能电池（DSSC）的、完全功能化的含寡聚噻吩香豆素染料。基于这些染料的DSSC在400 - 800 nm范围内的入射光子到电流转换效率（IPCE）方面表现良好。基于2-氰基-3-[5'-(1,1,6,6-四甲基-10-氧代-2,3,5,6-四氢-1H,4H,10H-11-氧杂-3a-氮杂-苯并[de]蒽-9-基)-[2,2']联噻吩基-5-基]丙烯酸（NKX-2677）的DSSC在模拟AM 1.5G辐照（100 mW cm⁻²）且带有掩膜的条件下，获得了7.4%的太阳能到电能转换效率（η）：短路电流密度（J(sc)）= 13.5 mA cm⁻²；开路电压（V(oc)）= 0.71 V；填充因子（FF）= 0.77。瞬态吸收光谱测量表明，从NKX-2677到TiO₂导带的电子注入非常迅速（<100 fs），这比染料的发射寿命（1.0 ns）快得多，从而实现了接近100%的高效电子注入产率。
