Bimolecular recombination in regioregular and regiorandom poly(3-hexylthiophene):PCBM using photoinduced absorption spectroscopy

Harri Aarnio, Ronald Österbacka*

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedingConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

We have used photoinduced absorption (PA) spectroscopy and measured the intensity dependence on thin films of 1:1 blends of regioregular-poly(3- hexylthiophene):PCBM before and after annealing as well as on 1:1 blends of regiorandom-poly(3-hexylthiophene):PCBM. We have calculated the bimolecular recombination coefficients from the out-of-phase component of the photoinduced absorption. Annealing shows no change in the bimolecular recombination coefficients of rr-P3HT:PCBM, but the increased PA amplitude suggests that the geminate (monomolecular) recombination is reduced. In rra-P3HT:PCBM, the bimolecular recombination coefficient estimated by the same method (disregarding dispersion) is significantly smaller, indicating together with a low PA amplitude that the recombination is primarily geminate.

Original languageEnglish
Title of host publicationProceedings of the Spring 2011 E-MRS Meeting, Symposium S
Subtitle of host publicationOrganic Photovoltaics: Science and Technology
PublisherElsevier Ltd
Pages21-25
Number of pages5
ISBN (Print)9781627484404
DOIs
Publication statusPublished - 2012
MoE publication typeA4 Article in a conference publication
EventSpring 2011 E-MRS Meeting, Symposium S: Organic Photovoltaics: Science and Technology - Nice, France
Duration: 9 May 201113 May 2011

Publication series

NameEnergy Procedia
Volume31
ISSN (Print)1876-6102

Conference

ConferenceSpring 2011 E-MRS Meeting, Symposium S: Organic Photovoltaics: Science and Technology
CountryFrance
CityNice
Period09/05/1113/05/11

Keywords

  • Intensity dependence
  • Photoinduced absorption
  • Recombination
  • Solar cells

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