Amao Yutaka, Yamada Yuriko
Department of Applied Chemistry, Oita University, Dannoharu 700, Oita 870-1192, Japan.
Biosens Bioelectron. 2007 Feb 15;22(7):1561-5. doi: 10.1016/j.bios.2006.07.006. Epub 2006 Aug 22.
Photovoltaic conversion using zinc chlorin-e6 (ZnChl-e6), which is zinc chlorophyll-a derivative, and fatty acid (myristic acid or cholic acid) co-adsorbed nanocrystalline TiO2 layer onto ITO glass (OTE) electrode is developed. The maximum peaks of photocurrent action spectrum of the ZnChl-e6 adsorbed TiO2 layer onto OTE (ZnChl-e6/TiO2) are 400, 660 and 800 nm, respectively. Especially the IPCE value at 800 nm (7.5%) is larger than that of 660 nm (6.9%). This result indicates that ZnChl-e6 molecules is aggregated or formed dimer on a nanocrystalline TiO2 layer onto OTE and the absorption band is shifted to near IR region. The photocurrent action spectrum of ZnChl-e6 and cholic acid adsorbed TiO2 layer onto OTE (ZnChl-e6-Cho/TiO2 is similar to that of the UV-vis absorption spectrum in methanol solution, and IPCE values at 400 and 660 nm (8.1%) increase and the IPCE value at 800 nm (4.1%) decreases, indicating that the aggregation of ZnChl-e6 molecules on the TiO2 is suppressed by cholic acid. By using ZnChl-e6-Cho/TiO2, the short-circuit photocurrent density and open-circuit photovoltage also increase compared with that of ZnChl-e6 adsorbed nanocrystalline TiO2 electrode.
开发了一种光伏转换方法，该方法使用二氢卟吩 - e6锌（ZnChl - e6，一种叶绿素 - a锌衍生物）和脂肪酸（肉豆蔻酸或胆酸）共同吸附在氧化铟锡（ITO）玻璃（OTE）电极上的纳米晶TiO₂层。吸附在OTE上的ZnChl - e6/TiO₂层的光电流作用光谱的最大峰值分别为400、660和800 nm。特别是800 nm处的光电转换效率（IPCE）值（7.5%）大于660 nm处的（6.9%）。该结果表明，ZnChl - e6分子在OTE上的纳米晶TiO₂层上聚集或形成二聚体，并且吸收带移至近红外区域。吸附在OTE上的ZnChl - e6和胆酸的TiO₂层（ZnChl - e6 - Cho/TiO₂）的光电流作用光谱与甲醇溶液中的紫外 - 可见吸收光谱相似，400和660 nm处的IPCE值（8.1%）增加，而800 nm处的IPCE值（4.1%）降低，这表明胆酸抑制了ZnChl - e6分子在TiO₂上的聚集。与吸附了ZnChl - e6的纳米晶TiO₂电极相比，使用ZnChl - e6 - Cho/TiO₂时，短路光电流密度和开路光电压也会增加。
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