DOI: 10.1063/1.1924540. Exciton dissociation dynamics in model donor-acceptor polymer heterojunctions. I. Energetics and spectra

Exciton dissociation dynamics in model donor-acceptor polymer heterojunctions. I. Energetics and spectra

10.1063/1.1924540

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

In this paper we consider the essential electronic excited states in parallel chains of semiconducting polymers that are currently being explored for photovoltaic and light-emitting diode applications. In particular, we focus upon various type II donor-acceptor heterojunctions and explore the relation between the exciton binding energy to the band offset in determining the device characteristic of a particular type II heterojunction material. As a general rule, when the exciton binding energy is greater than the band offset at the heterojunction, the exciton will remain the lowest-energy excited state and the junction will make an efficient light-emitting diode. On the other hand, if the offset is greater than the exciton binding energy, either the electron or hole can be transferred from one chain to the other. Here we use a two-band exciton to predict the vibronic absorption and emission spectra of model polymer heterojunctions. Our results underscore the role of vibrational relaxation and suggest that intersystem crossings may play some part in the formation of charge-transfer states following photoexcitation in certain cases.

Bibliography

Bittner, E. R., Ramon, J. G. S., & Karabunarliev, S. (2005). Exciton dissociation dynamics in model donor-acceptor polymer heterojunctions. I. Energetics and spectra. The Journal of Chemical Physics, 122(21).

Authors 3

Eric R. Bittner (first)
John Glenn Santos Ramon (additional)
Stoyan Karabunarliev (additional)

References 62 Referenced 56

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Dates

Type	When
Created	20 years, 2 months ago (June 6, 2005, 8:20 p.m.)
Deposited	2 years, 1 month ago (July 30, 2023, 6:24 p.m.)
Indexed	1 month, 1 week ago (July 30, 2025, 6:45 a.m.)
Issued	20 years, 3 months ago (June 1, 2005)
Published	20 years, 3 months ago (June 1, 2005)
Published Online	20 years, 2 months ago (June 8, 2005)
Published Print	20 years, 3 months ago (June 1, 2005)

Funders 0

None

BibTeX

@article{Bittner_2005, title={Exciton dissociation dynamics in model donor-acceptor polymer heterojunctions. I. Energetics and spectra}, volume={122}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1924540}, DOI={10.1063/1.1924540}, number={21}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Bittner, Eric R. and Ramon, John Glenn Santos and Karabunarliev, Stoyan}, year={2005}, month=jun }

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