Time-resolved microwave photoconductivity study of P3HT: Fullerene bulk heterojunctions for organic photovoltaic devices

Andrew J. Ferguson, Nikos Kopidakis, Timothy J. McDonald, Jorge Piris, Sean E. Shaheen, Michael J. Heben, Gary Rumbles

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

Abstract

The photoconductivity of blends of the polymer poly(3-hexylthiophene) (P3HT) and the fullerene-based acceptor [6,6]-phenyl C61-butyric acid methyl ester (PCBM), the prototypical active layer in organic photovoltaic devices, has been investigated using the contactless Flash-Photolysis Time-Resolved Microwave Conductivity (FP-TRMC) technique. Upon this firm foundation, bulk heterojunctions in which the electron acceptor has been replaced by carbon nanotubes have also been prepared. Critical to the efficacy of these structures is the generation and quenching of excitons, and transport, trapping and recombination of carriers. We develop a kinetic scheme to describe photoinduced exciton and free carrier generation and decay, which permits comparison with existing models for pristine polymer films and bulk heterojunctions. We show that exciton relaxation involves a first order process, resulting in free carrier generation, and that quenching of excitons by holes limits free carrier generation at high light intensities, and discuss the ramifications on the operation of bulk-heterojunction photovoltaic devices.

Original languageEnglish
Title of host publicationACS National Meeting Book of Abstracts
Publication statusPublished - 2007
Event234th ACS National Meeting - Boston, MA, United States
Duration: Aug 19 2007Aug 23 2007

Other

Other234th ACS National Meeting
CountryUnited States
CityBoston, MA
Period8/19/078/23/07

Fingerprint

Fullerenes
Photoconductivity
Heterojunctions
Microwaves
Quenching
High intensity light
Carbon Nanotubes
Photolysis
Polymer films
Polymers
Kinetics
LDS 751
poly(3-hexylthiophene)
Electrons

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Ferguson, A. J., Kopidakis, N., McDonald, T. J., Piris, J., Shaheen, S. E., Heben, M. J., & Rumbles, G. (2007). Time-resolved microwave photoconductivity study of P3HT: Fullerene bulk heterojunctions for organic photovoltaic devices. In ACS National Meeting Book of Abstracts

Time-resolved microwave photoconductivity study of P3HT : Fullerene bulk heterojunctions for organic photovoltaic devices. / Ferguson, Andrew J.; Kopidakis, Nikos; McDonald, Timothy J.; Piris, Jorge; Shaheen, Sean E.; Heben, Michael J.; Rumbles, Gary.

ACS National Meeting Book of Abstracts. 2007.

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

Ferguson, AJ, Kopidakis, N, McDonald, TJ, Piris, J, Shaheen, SE, Heben, MJ & Rumbles, G 2007, Time-resolved microwave photoconductivity study of P3HT: Fullerene bulk heterojunctions for organic photovoltaic devices. in ACS National Meeting Book of Abstracts. 234th ACS National Meeting, Boston, MA, United States, 8/19/07.
Ferguson AJ, Kopidakis N, McDonald TJ, Piris J, Shaheen SE, Heben MJ et al. Time-resolved microwave photoconductivity study of P3HT: Fullerene bulk heterojunctions for organic photovoltaic devices. In ACS National Meeting Book of Abstracts. 2007
Ferguson, Andrew J. ; Kopidakis, Nikos ; McDonald, Timothy J. ; Piris, Jorge ; Shaheen, Sean E. ; Heben, Michael J. ; Rumbles, Gary. / Time-resolved microwave photoconductivity study of P3HT : Fullerene bulk heterojunctions for organic photovoltaic devices. ACS National Meeting Book of Abstracts. 2007.
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AU - Rumbles, Gary

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