Exciton energy and charge transfer in porphyrin aggregate/semiconductor (TiO2) composites

Verma, Sandeep ; Ghosh, Hirendra N. (2012) Exciton energy and charge transfer in porphyrin aggregate/semiconductor (TiO2) composites Journal of Physical Chemistry Letters, 3 (14). pp. 1877-1884. ISSN 1948-7185

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jz300639q

Related URL: http://dx.doi.org/10.1021/jz300639q


A porphyrin aggregate is reported that exhibits novel exciton state properties for light-harvesting applications. This porphyrin aggregate enables control of energy dissipation of coherent excited states by changing the self-assembly pattern. New exciton spectral features create a new route of energy transfer in this porphyrin aggregate. The kinetic model of exciton state decay is addressed in this Perspective by reporting steady-state and transient emission and absorption studies of porphyrin J- and H-aggregates. The porphyrin J-aggregate emerges with better spectral coverage and exciton dynamics, which are suitable for light-harvesting antenna functions. This motif is explored in a photosensitization study of TiO2 semiconductor materials. The transient absorption studies show that the J-aggregate improves the photoinduced charge separation at the porphyrin/TiO2 interface. The higher charge separation is attributed to exciton-coupled charge-transfer processes in porphyrin J-aggregate/TiO2 hybrid materials. It represents the potential of porphyrin aggregates in biomimetic artificial antenna activity.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:101680
Deposited On:01 Feb 2017 11:06
Last Modified:01 Feb 2017 11:06

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