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A Close Look at Charge Generation in Polymer:Fullerene Blends with Microstructure Control

Scarongella, Mariateresa ; Jonghe-Risse, Jelissa De ; Buchaca-Domingo, Ester ; Causa, Martina ; Fei, Zhuping ; Heeney, Martin ; Moser, Jacques-E. ; Stingelin, Natalie ; Banerji, Natalie

In: Journal of the American Chemical Society, 2015, vol. 137, no. 8, p. 2908–2918

We reveal some of the key mechanisms during charge generation in polymer:fullerene blends exploiting our well-defined understanding of the microstructures obtained in pBTTT:PCBM systems via processing with fatty acid methyl ester additives. Based on ultrafast transient absorption, electro-absorption, and fluorescence up-conversion spectroscopy, we find that exciton diffusion through relatively...