Change search
ReferencesLink to record
Permanent link

Direct link
Origin of Reduced Bimolecular Recombination in Blends of Conjugated Polymers and Fullerenes
Delft University of Technology, Netherlands .
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
Vilnius University, Lithuania .
Show others and affiliations
2013 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 23, no 34, 4262-4268 p.Article in journal (Refereed) Published
Abstract [en]

Bimolecular charge carrier recombination in blends of a conjugated copolymer based on a thiophene and quinoxaline (TQ1) with a fullerene derivative ((6,6)-phenyl-C-71-butyric acidmethyl ester, PC71BM) is studied by two complementary techniques. TRMC (time-resolved microwave conductance) monitors the conductance of photogenerated mobile charge carriers locally on a timescale of nanoseconds, while using photo-CELIV (charge extraction by linearly increasing voltage) charge carrier dynamics are monitored on a macroscopic scale and over tens of microseconds. Despite these significant differences in the length and time scales, both techniques show a reduced Langevin recombination with a prefactor close to 0.05. For TQ1:PC71BM blends, the value is independent of temperature. On comparing TRMC data with electroluminescence measurements it is concluded that the encounter complex and the charge transfer state have very similar energetic properties. The value for annealed poly(3-hexylthiophene) (P3HT):(6,6)-phenyl-C-61-butyric acid methyl ester (PC61BM) is approximately 10(-4), while for blend systems containing an amorphous polymer values are close to 1. These large differences can be related to the extent of charge delocalization of opposite charges in an encounter complex. Insight is provided into factors governing the bimolecular recombination process, which forms a major loss mechanism limiting the efficiency of polymer solar cells.

Place, publisher, year, edition, pages
Wiley-VCH Verlag , 2013. Vol. 23, no 34, 4262-4268 p.
Keyword [en]
organic photovoltaics (OPVs), bimolecular recombination, charge transfer states, charge delocalization
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-102788DOI: 10.1002/adfm.201203852ISI: 000327492500011OAI: diva2:683862

Funding Agencies|Dutch Polymer Institute (DPI)|681|Swedish Energy Agency||European Social Fund under the Global Grant measure||

Available from: 2014-01-07 Created: 2013-12-26 Last updated: 2014-01-16

Open Access in DiVA

fulltext(1106 kB)565 downloads
File information
File name FULLTEXT01.pdfFile size 1106 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Melianas, ArmantasTang, ZhengZhang, FenglingInganäs, Olle
By organisation
Biomolecular and Organic ElectronicsThe Institute of Technology
In the same journal
Advanced Functional Materials
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 565 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 219 hits
ReferencesLink to record
Permanent link

Direct link