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|Title:||Excitation dynamics of a low bandgap silicon-bridged dithiophene copolymer and its composites with fullerenes||Authors:||Choulis, Stelios A.
Othonos, Andreas S.
|Keywords:||Energy gap (Physics);Copolymers;Dynamics;Heterojunctions||Category:||Chemical Engineering||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)
|DOI:||10.1063/1.3703601||Rights:||© 2012 American Institute of Physics||Type:||Article|
|Appears in Collections:||Άρθρα/Articles|
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