Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/10054/4551
Title: Photophysics of charge-transfer excitons in thin films of pi-conjugated polymers
Authors: WANG, ZD
MAZUMDAR, S
SHUKLA, A
Keywords: Interchain Interactions
Poly(P-Phenylene Vinylene)
Absorption
Photoluminescence
Emission
States
Electroabsorption
Photoexcitations
Spectroscopy
Generation
Issue Date: 2008
Publisher: AMER PHYSICAL SOC
Citation: PHYSICAL REVIEW B, 78(23), -
Abstract: We develop a theory of the electronic structure and photophysics of interacting chains of pi-conjugated polymers to understand the differences between solutions and films. While photoexcitation generates only the intrachain exciton in solutions, the optical exciton as well as weakly allowed charge-transfer excitons are generated in films. We extend existing theories of the lowest polaron pair and charge-transfer excitons to obtain descriptions of the excited states of these interchain species, and we show that a significant fraction of ultrafast photoinduced absorptions in films originates from the lowest charge-transfer exciton. Our proposed mechanism explains the simultaneous observation of polaronlike-induced absorption features peculiar to films in ultrafast spectroscopy and the absence of mobile charge carriers as deduced from other experiments. We also show that there is a 1:1 correspondence between the essential states that describe the photophysics of single chains and of interacting chains that constitute thin films.
URI: http://dx.doi.org/10.1103/PhysRevB.78.235109
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4551
http://hdl.handle.net/10054/4551
ISSN: 1098-0121
Appears in Collections:Article

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