Influence of nanoscale phase separation on geminate versus bimolecular recombination in P3HT:fullerene blend films
Artikel i vetenskaplig tidskrift, 2010

In this paper, we compare the charge recombination dynamics observed in films comprising poly(3-hexylthiophene) blended with three fullerene derivatives: PCBM and two alternative pyrazolinofullerenes. Transient absorption data indicate that replacement of PCBM with either of the pyrazolinofullerene derivatives results in a transition from bimolecular to monomolecular (geminate) recombination dynamics. We show that this transition cannot be explained by a difference in interfacial energetics. However, this transition does correlate with nanomorphology data which indicate that both pyrazolinofullerenes yield a much finer phase segregation, with correspondingly smaller domain sizes, than observed with PCBM. Our results therefore provide clear evidence of the role of nanomorphology in determining the nature of recombination dynamics in such donor/acceptor blends.

NETWORK

EFFICIENCY

COMPOSITES

PHOTODIODES

PERFORMANCE

MORPHOLOGY

POLYMER

GENERATION

TRANSPORT

HETEROJUNCTION SOLAR-CELLS

Författare

Safa Shoaee

Eva Espildora

Juan-Luis Delgado

Bert Campo

Nazario Martín

Dirk Vanderzande

James Durrant

Energy and Environmental Sciences

1754-5692 (ISSN)

Vol. 7 971-976

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