On the Efficiency of Charge Transfer State Splitting in Polymer:Fullerene Solar Cells

The field dependence and yield of free charge carrier generation in polymer:fullerene blends with varying energetic offsets is not affected when the excitation energy is varied from above band‐gap to direct CT state excitation. Instead, the ability of the CT state to split is dictated by the energet...

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Veröffentlicht in:	Advanced materials (Weinheim) 2014-04, Vol.26 (16), p.2533-2539
Hauptverfasser:	Albrecht, Steve, Vandewal, Koen, Tumbleston, John R., Fischer, Florian S. U., Douglas, Jessica D., Fréchet, Jean M. J., Ludwigs, Sabine, Ade, Harald, Salleo, Alberto, Neher, Dieter
Format:	Artikel
Sprache:	eng
Schlagworte:	Charge charge generation Charge transfer charge transfer states driving force excess energy Excitation geminate recombination morphology Offsets organic solar cells Photovoltaic cells Polymer blends Solar cells spectroelectrochemistry Splitting
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Beschreibung
Zusammenfassung:	The field dependence and yield of free charge carrier generation in polymer:fullerene blends with varying energetic offsets is not affected when the excitation energy is varied from above band‐gap to direct CT state excitation. Instead, the ability of the CT state to split is dictated by the energetic offset between the relaxed CT state and the charge separated (CS) state.
ISSN:	0935-9648 1521-4095
DOI:	10.1002/adma.201305283