Photoconductivity and Charge Generation in a Thin Films of Pi-Conjugated Polymers

conference paper

English

Our contribution focuses on photoconductivity within the spectral range of the S1 ? S0 transition, i.e. below the energy at which instantaneous dissociation of a singlet (S1) exciton prior to vibrational cooling occurs. It is obvious that there two processes occurring in the bulk of conjugated polymer that can give rise to photogeneration [1]-[3]. One of them is the field assisted dissociation into geminate pairs that subsequently can separate fully. This is a generic process but requires a strong electric field. The other one is sensitized photogeneartion at either non intentional or intentional dopants that can act as electron scavengers. In summary we emphasize that in neither case the Onsager description is applicable because in the intrinsic case the field assistance in the primary event of exciton breaking is disregarded in the Onsager formalism, while in the other case GP disssociation is aided by the finite energy of the charge carrier (hole) that resides on a segment of the conjugated polymer next to the counter charge.

transient photoconductivity, charge transport

WEITER, M.; BAESSLER, H.

2005

1. 8. 2005

University Cracow

Cracow

83-921060-0-8

Book of Abstracts of 6th International Conference on Excitonic Processes in Condensed Matter

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P124

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