Exciton dissociation at nanostructured donor-acceptor interfaces

Gary Rumbles, Nikos Kopdakis, Andrew Ferguson, David Coffey, Josh Holt, Jeffrey Blackburn

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Photovoltaic solar cells based on organic systems are emerging as a viable technology platform, with current devices exhibiting good performance and durability. Common to almost all of these new devices is a nanostructured interface that comprises a electron donor system, often a conjugated polymer such as poly (3-hexylthiophene), and more often than not, C 60 as an electron acceptor. A unique and essential feature of these interfaces is the ability to efficiently dissociate the photo-generated excitons into free carriers and, more importantly, to very effectively inhibit the reverse, recombination process. A uniform consensus on why this happens has yet to emerge and it is therefore a topic of great interest. Although they are considered to be a viable technology, solar cell power conversion efficiencies have only just exceeded 8%, and while this value is impressive, a further factor of two, at minimum, is needed. Incremental improvements in device performance cannot achieve this goal, and it requires a more fundamental, basic research to be focused on the problem. It is this type of approach that motivates this presentation. The talk will focus on the use of time-resolved microwave conductivity, using pulsed laser excitation, as a tool for probing both the production and loss of free carriers that result from exciton dissociation. Two systems will be examined: (i) the use of single-wall carbon nanotubes (SWNTs) instead of PCBM as the electron acceptor when dispersed in a conjugated polymer film, and (ii) the dissociation of excitons generated directly in PCBM when dispersed in a range of hole-accepting polymers.

Original languageEnglish
Title of host publicationACS National Meeting Book of Abstracts
Publication statusPublished - 2011
Event242nd ACS National Meeting and Exposition - Denver, CO, United States
Duration: Aug 28 2011Sep 1 2011

Other

Other242nd ACS National Meeting and Exposition
CountryUnited States
CityDenver, CO
Period8/28/119/1/11

Fingerprint

Excitons
Conjugated polymers
Electrons
Solar cells
Carbon Nanotubes
Laser excitation
Pulsed lasers
Polymer films
Conversion efficiency
Carbon nanotubes
Polymers
Durability
Microwaves
LDS 751
poly(3-hexylthiophene)

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Rumbles, G., Kopdakis, N., Ferguson, A., Coffey, D., Holt, J., & Blackburn, J. (2011). Exciton dissociation at nanostructured donor-acceptor interfaces. In ACS National Meeting Book of Abstracts

Exciton dissociation at nanostructured donor-acceptor interfaces. / Rumbles, Gary; Kopdakis, Nikos; Ferguson, Andrew; Coffey, David; Holt, Josh; Blackburn, Jeffrey.

ACS National Meeting Book of Abstracts. 2011.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Rumbles, G, Kopdakis, N, Ferguson, A, Coffey, D, Holt, J & Blackburn, J 2011, Exciton dissociation at nanostructured donor-acceptor interfaces. in ACS National Meeting Book of Abstracts. 242nd ACS National Meeting and Exposition, Denver, CO, United States, 8/28/11.
Rumbles G, Kopdakis N, Ferguson A, Coffey D, Holt J, Blackburn J. Exciton dissociation at nanostructured donor-acceptor interfaces. In ACS National Meeting Book of Abstracts. 2011
Rumbles, Gary ; Kopdakis, Nikos ; Ferguson, Andrew ; Coffey, David ; Holt, Josh ; Blackburn, Jeffrey. / Exciton dissociation at nanostructured donor-acceptor interfaces. ACS National Meeting Book of Abstracts. 2011.
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