Wang Zhong-Sheng, Hara Kohjiro, Dan-oh Yasufumi, Kasada Chiaki, Shinpo Akira, Suga Sadaharu, Arakawa Hironori, Sugihara Hideki
Solar Light Energy Conversion Team, Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1, Higashi, Tsukuba, Ibaraki 305-8565, Japan.
J Phys Chem B. 2005 Mar 10;109(9):3907-14. doi: 10.1021/jp044851v.
A new coumarin dye, cyano-{5,5-dimethyl-3-[2-(1,1,6,6-tetramethyl-10-oxo-2,3,5,6-tetrahydro-1H,4H,10H-11-oxa-3a-aza-benzo[de]anthracen-9-yl)vinyl]cyclohex-2-enylidene}-acetic acid (NKX-2753), was prepared and characterized with respect to photophysical and electrochemical properties. It was employed as a dye sensitizer in dye-sensitized solar cells and showed efficient photon-to-electron conversion properties. The photocurrent action spectrum exhibited a broad feature with a maximum incident photon-to-electron conversion efficiency (IPCE) of 84% at 540 nm, which is comparable to that for the famous red dye RuL2(NCS)2 (known as N3), where L stands for 2,2'-bipyridyl-4,4'-dicarboxylic acid. The sandwich-type solar cell with NKX-2753, under illumination of full sun (AM1.5, 100 mW cm(-2)), produced 16.1 mA cm(-2) of short-circuit photocurrent, 0.60 V of open-circuit photovoltage, and 0.69 of fill factor, corresponding to 6.7% of overall energy conversion efficiency using 0.1 M LiI, 0.05 M I2, 0.1 M guanidinium thiocyanate, and 0.6 M 1,2-dimethyl-3-n-propyl-imidazolium iodide in dry acetonitrile as redox electrolyte. In comparison with its analogue NKX-2586 (Langmuir 2004, 20, 4205), NKX-2753 with an extra side ring on the alkene chain produced much higher IPCE values at the same conditions. The side ring acted as a spacer to efficiently prevent dye aggregation when adsorbed on the TiO2 surface, resulting in significant improvements of short-circuit photocurrent, open-circuit photovoltage, and fill factor compared with NKX-2586 that aggregated on the TiO2 surface.
制备了一种新型香豆素染料，氰基-{5,5-二甲基-3-[2-(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)乙烯基]环己-2-烯叉基}-乙酸（NKX-2753），并对其光物理和电化学性质进行了表征。它被用作染料敏化太阳能电池中的染料敏化剂，表现出高效的光子到电子的转换性能。光电流作用光谱呈现出宽谱特征，在540 nm处最大入射光子到电子转换效率（IPCE）为84%，这与著名的红色染料RuL2(NCS)2（称为N3，其中L代表2,2'-联吡啶-4,4'-二羧酸）相当。在全阳光（AM1.5，100 mW cm(-2)）照射下，带有NKX-2753的三明治型太阳能电池产生了16.1 mA cm(-2)的短路光电流、0.60 V的开路光电压和0.69的填充因子，对应于使用0.1 M LiI、0.05 M I2、0.1 M硫氰酸胍和0.6 M 1,2-二甲基-3-正丙基-咪唑鎓碘化物在干燥乙腈中作为氧化还原电解质时的6.7%的总能量转换效率。与其类似物NKX-2586（《朗缪尔》2004年，20卷，4205页）相比，在烯烃链上带有额外侧环的NKX-2753在相同条件下产生了更高的IPCE值。侧环起到间隔物的作用，在吸附于TiO2表面时有效地防止染料聚集，与聚集在TiO2表面的NKX-2586相比，显著提高了短路光电流、开路光电压和填充因子。
