Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 23: Charge transfer effects in molecular materials II (CPP, jointly with BP, DS, HL)
HL 23.6: Talk
Monday, March 11, 2013, 16:45–17:00, H40
Reduced recombination and field independent charge carrier generation in polymer-polymer solar cells — •Steffen Roland1, Marcel Schubert1, Zhihua Chen2, Antonio Facchetti2, and Dieter Neher1 — 1University of Potsdam, Institute of Physics and Astronomy — 2Polyera Corporation
Charge transport and recombination are investigated for solar cells made of poly(3-hexylthiphene) (P3HT) and the non-fullerene, high mobility acceptor copolymer P(NDI2OD-T2). Optimized devices show high fill factors of up to 70%, indicating that the excellent electron transport properties of pure P(NDI2OD-T2) is prevailed in the blend. By applying of the time delayed collection field technique (TDCF) we measured the field dependence of the charge carrier generation, and of the non geminate recombination as well as the electron and hole mobilities. The results reveal a field-independent photocurrent generation and a strongly reduced recombination coefficient for free charge carriers. The results imply that major charge carrier losses originate from an ultrafast (geminate) recombination on time scales below 10 ns.