Open-circuit voltage loss in annealed P3HT:perylene diimide bulk heterojunction solar cells

Solar cells based on blends of regioregular poly(3-hexylthiophene) as a donor and a commercial perylene diimide derivative as a acceptor are investigated. Thermal annealing of the devices results in increased photocurrent generation but is simultaneously accompanied by a loss in open-circuit voltage...

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Veröffentlicht in:Applied physics letters 2017-04, Vol.110 (16)
Hauptverfasser: Solak, S., Ricciardulli, A. G., Lenz, T., Crăciun, N. I., Blom, P. W. M., Wetzelaer, G. A. H.
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container_title Applied physics letters
container_volume 110
creator Solak, S.
Ricciardulli, A. G.
Lenz, T.
Crăciun, N. I.
Blom, P. W. M.
Wetzelaer, G. A. H.
description Solar cells based on blends of regioregular poly(3-hexylthiophene) as a donor and a commercial perylene diimide derivative as a acceptor are investigated. Thermal annealing of the devices results in increased photocurrent generation but is simultaneously accompanied by a loss in open-circuit voltage. It is shown that the decreased open-circuit voltage is caused by the formation of a cathode barrier, as evidenced by injection-limited electron currents, a reduced built-in voltage, and a weaker light-intensity dependence of the open-circuit voltage. Device simulations show that the increased photocurrent after annealing is the result of an increased electron mobility.
doi_str_mv 10.1063/1.4980842
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title Open-circuit voltage loss in annealed P3HT:perylene diimide bulk heterojunction solar cells
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