Please use this identifier to cite or link to this item: https://ktisis.cut.ac.cy/handle/10488/14136
Title: Excitation dynamics of a low bandgap silicon-bridged dithiophene copolymer and its composites with fullerenes
Authors: Choulis, Stelios A.
Othonos, Andreas
Neophytou, Marios
Itskos, Grigorios
Issue Date: 9-Apr-2012
Journal: Applied Physics Letters
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. © 2012 American Institute of Physics.
URI: https://ktisis.cut.ac.cy/handle/10488/14136
ISSN: 00036951
DOI: 10.1063/1.3703601
Type: Article
Appears in Collections:Άρθρα/Articles

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