Journal
BIOSENSORS & BIOELECTRONICS
Volume 22, Issue 7, Pages 1561-1565Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2006.07.006
Keywords
photovoltaic conversion; Zn chlorin-e(6); nanocrystalline TiO2; fatty acid; artificial photosynthesis
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Photovoltaic conversion using zinc chlorin-e(6) (ZnChl-e(6)), 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-e(6) adsorbed TiO2 layer onto OTE (ZnChl-e(6)/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-e(6) 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-e(6) and cholic acid adsorbed TiO2 layer onto OTE (ZnChl-e(6)-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-e(6) Molecules on the TiO2 is suppressed by cholic acid. By using ZnChl-e(6)-Cho/TiO2, the short-circuit photocurrent density and open-circuit photovoltage also increase compared with that of ZnChl-e(6) adsorbed nanocrystalline TiO2 electrode. (c) 2006 Elsevier B.V. All rights reserved.
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