Organized assemblies of single wall carbon nanotubes and porphyrin for photochemical solar cells: Charge injection from excited porphyrin into single-walled carbon nanotubes

被引:171
作者
Hasobe, Taku
Fukuzumi, Shunichi
Kamat, Prashant V.
机构
[1] Osaka Univ, SORST, Japan Sci & Technol Agcy,Dept Mat & Life Sci, Grad Sch Engn,Div Adv Sci & Biotechnol, Suita, Osaka 5650871, Japan
[2] Univ Notre Dame, Dept Chem & Biochem, Radiat Lab, Notre Dame, IN 46556 USA
[3] Univ Notre Dame, Dept Chem & Biomol Engn, Radiat Lab, Notre Dame, IN 46556 USA
关键词
D O I
10.1021/jp064845u
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Photochemical solar cells have been constructed from organized assemblies of single-walled carbon nanotubes (SWCNT) and protonated porphyrin on nanostructured SnO2 electrodes. The protonated form of porphyrin ( H4P2+) and SWCNT composites form 0.5-3.0 mu m-sized rodlike structures and they can be assembled onto nanostructured SnO2 films [optically transparent electrode OTE/SnO2] by an electrophoretic deposition method. These organized assemblies are photoactive and absorb strongly in the entire visible region. The incident photon to photocurrent efficiency ( IPCE) of OTE/SnO2/SWCNT-H4P2+ is similar to 13% at an applied potential of 0.2 V versus saturated calomel electrode. Femtosecond pump-probe spectroscopy experiments confirm the decay of the excited porphyrin in the SWCNT-H4P2+ assembly as it injects electrons into SWCNT. The dual role of SWCNT in promoting photoinduced charge separation and facilitating charge transport is presented.
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页码:25477 / 25484
页数:8
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