Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 110, Issue 50, Pages 25477-25484Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp064845u
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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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