Please use this identifier to cite or link to this item: http://ktisis.cut.ac.cy/handle/10488/7519
Title: Excitation dynamics of a low bandgap silicon-bridged dithiophene copolymer and its composites with fullerenes
Authors: Choulis, Stelios A. 
Othonos, Andreas S. 
Itskos, Grigorios 
Neophytou, Marios 
Keywords: Energy gap (Physics)
Copolymers
Dynamics
Heterojunctions
metadata.dc.subject.category: Chemical Engineering
metadata.dc.subject.field: Engineering and Technology
Issue Date: 2012
Publisher: American Institute of Physics
Source: Applied physics letters, 2012, Volume 100, Issue 15, Pages 1-4
Abstract: We report on excitation dynamics in pristine and bulk heterojunction films of the low bandgap silicon-bridged dithiophene copolymer poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-b:2′, 3′-d]silole)-2,6-diyl-alt-(4,7-bis(2-thienyl)-2,1,3-benzothiadiazole)-5,5′-diyl] with methanofullerene derivatives. The combination of ultrafast transient transmission and photoluminescence allows us to probe the relaxation of both exciton and polaron states in a relatively wide spectral and temporal range. Measurements reveal that the majority of excitations undergo ultrashort non-radiative relaxation while a small fraction of the photoexcited species decays slowly within hundreds of ps. In the blend films, significantly longer decays are observed suggesting the presence of long lived holes and/or charged-transfer type of excitons
URI: http://ktisis.cut.ac.cy/handle/10488/7519
ISSN: 0003-6951 (print)
1077-3118 (online)
DOI: 10.1063/1.3703601
Rights: © 2012 American Institute of Physics
metadata.dc.type: Article
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