Organized assemblies of single wall carbon nanotubes and porphyrin for photochemical solar cells: Charge injection from excited porphyrin into single-walled carbon nanotubes
Organized assemblies of single wall carbon nanotubes and porphyrin for photochemical solar cells: Charge injection from excited porphyrin into single-walled carbon nanotubes
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DOI：
10.1021/jp064845u
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发表时间：
2006-12-21
影响因子：
3.3
通讯作者：
Kamat, Prashant V.
中科院分区：
文献类型：
--
作者：
Hasobe, Taku;Fukuzumi, Shunichi;Kamat, Prashant V.
光化学太阳能电池已经从单壁碳纳米管（SWCNT）和质子化卟啉的纳米结构的SnO 2电极的有组织的组件构造。质子化形式的卟啉（H4 P2+）和SWCNT复合物形成0.5-3.0 μ m大小的棒状结构，并且它们可以通过电泳沉积方法组装到纳米结构的SnO 2膜[光学透明电极OTE/SnO 2]上。这些有组织的组件是光活性的，并且在整个可见光区强烈吸收。OTE/SnO 2/SWCNT-H4 P2+的入射光子光电流效率（IPCE）在0.2V的外加电位下与饱和甘汞电极相比接近13%。飞秒泵浦-探测光谱实验证实了激发的卟啉在SWCNT-H4 P2+组件中的衰减，因为它将电子注入SWCNT。单壁碳纳米管在促进光诱导电荷分离和促进电荷传输的双重作用。
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.