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Τίτλος: Excitation dynamics of a low bandgap silicon-bridged dithiophene copolymer and its composites with fullerenes
Συγγραφείς: Choulis, Stelios A. 
Othonos, Andreas S. 
Itskos, Grigorios 
Neophytou, Marios 
metadata.dc.contributor.other: Νεοφύτου, Μάριος
Χούλης, Στέλιος Α.
Major Field of Science: Engineering and Technology
Field Category: Chemical Engineering
Λέξεις-κλειδιά: Energy gap (Physics);Copolymers;Dynamics;Heterojunctions
Ημερομηνία Έκδοσης: 2012
Πηγή: Applied physics letters, 2012, Volume 100, Issue 15, Pages 1-4
Περίληψη: 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: https://hdl.handle.net/20.500.14279/4417
ISSN: 0003-6951 (print)
1077-3118 (online)
DOI: 10.1063/1.3703601
Rights: © 2012 American Institute of Physics
Type: Article
Affiliation: University of Cyprus 
Cyprus University of Technology 
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