Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14279/18257
Title: Ultrafast transient optical studies of charge pair generation and recombination in poly-3-hexylthiophene(P3ht):[6,6]phenyl C61 butyric methyl acid ester (PCBM) blend films
Authors: Kirkpatrick, James 
Keivanidis, Panagiotis E. 
Bruno, Annalisa 
Ma, Fei 
Haque, Saif A 
Yarstev, Arkady 
Sundstrom, Villy 
Nelson, Jenny 
Major Field of Science: Engineering and Technology
Field Category: Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Excitons;Diffusion;Organic polymers;Kinetics;Recombination
Issue Date: 29-Dec-2011
Source: Journal of Physical Chemistry B, 2011, vol. 115, no. 51, pp. 15174-15180
Volume: 115
Issue: 51
Start page: 15174
End page: 15180
Journal: Journal of Physical Chemistry B 
Abstract: Charge generation and recombination are studied in blend films of poly-3-hexylthiophene (P3HT) and [6,6']phenyl C61 butyric acid methyl ester (PCBM) using ultrafast transient absorption spectroscopy. We find that the charge generation yield depends upon both blend film composition and thermal annealing. The data suggest that recombination occurs over a wide range of time scales and that, in the least favorable cases, the fastest charge recombination occurs on a time scale similar to exciton diffusion. The results are explained using a simple model that incorporates the effect of P3HT domain size on exciton diffusion and uses empirical models of recombination kinetics. We propose our method as a route to interpretation of spectroscopic data where different processes occur on similar time scales.
ISSN: 15205207
DOI: 10.1021/jp205731f
Rights: © American Chemical Society
Type: Article
Affiliation : Imperial College London 
Lund University 
Publication Type: Peer Reviewed
Appears in Collections:Άρθρα/Articles

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