Hole mobility effect in the efficiency of bilayer heterojunction polymer/C60 photovoltaic cells

Hole mobility effect in the efficiency of bilayer heterojunction polymer/C60 photovoltaic cells

We report here bilayer heterojunction solar cells fabricated by using poly[9,9′-hexyl-fluorene-alt-bithiophene] (LaPPS43) polymer as active layer. The power conversion efficiency (η) displays a sevenfold increase upon annealing at 200 °C, reaching the value of 2.8%. This result is comparable to the...

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Veröffentlicht in:Applied physics letters 2011-06, Vol.98 (25)
Hauptverfasser: Macedo, Andreia G., Marchiori, Cleber F. N., Grova, Isabel R., Akcelrud, Leni, Koehler, Marlus, Roman, Lucimara S.
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container_issue 25
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container_title Applied physics letters
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creator Macedo, Andreia G.
Marchiori, Cleber F. N.
Grova, Isabel R.
Akcelrud, Leni
Koehler, Marlus
Roman, Lucimara S.
description We report here bilayer heterojunction solar cells fabricated by using poly[9,9′-hexyl-fluorene-alt-bithiophene] (LaPPS43) polymer as active layer. The power conversion efficiency (η) displays a sevenfold increase upon annealing at 200 °C, reaching the value of 2.8%. This result is comparable to the highest η reported so far for bulk heterojunction solar cells using the same polymer. Simulation, absorbance spectra, and current versus voltage results indicate that the π–π stacking in solid state is enhanced after annealing with a reduction in traps and thus reflecting in higher hole mobility.
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title Hole mobility effect in the efficiency of bilayer heterojunction polymer/C60 photovoltaic cells
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