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Excitation dynamics of a low bandgap silicon-bridged dithiophene copolymer and its composites with fullerenes
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Figures

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FIG. 1.

Absorption and PL of Si-PCPDTBT polymer and Si-PCPDTBT:PCBM bulk heterojunction films.

Image of FIG. 2.

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FIG. 2.

Transient transmission decays of Si-PCPDTBT polymer at several probing photon energies for excitation at 3.1 eV. The inset shows the ΔT/T at zero optical delay where the signal is maximum for the different probing photon energies.

Image of FIG. 3.

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FIG. 3.

TR-PL decays from the pristine film and the 1:1 and 1:4 blends probing at the first vibronic (1.5 eV) and at the low energy side of the second vibronic (1.3 eV).

Image of FIG. 4.

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FIG. 4.

Transient transmission decays of the Si-PCPDTBT:PCBM (1:4) film at different probe photon energies. The inset shows the ΔT/T at zero optical delay for the different probing photon energies.

Image of FIG. 5.

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FIG. 5.

Normalized transient transmission decays of the Si-PCPDTBT polymer (1:0) and the Si-PCPDTBT:PCBM blends (1:1, 1:2, and 1:4) film at different probe photon energies.

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/content/aip/journal/apl/100/15/10.1063/1.3703601
2012-04-12
2014-04-25

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.

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Scitation: Excitation dynamics of a low bandgap silicon-bridged dithiophene copolymer and its composites with fullerenes
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/15/10.1063/1.3703601
10.1063/1.3703601
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