Donal D. C. Bradley (1269006)

James R. Durrant (1268991)

Jean-Luc Brédas (1271541)

John G. Labram (1342323)

Safa Shoaee (1282368)

Shafigh Mehraeen (1342320)

Thomas D. Anthopoulos (1318539)

Veaceslav Coropceanu (1290342)

SDEGNO E.

Archivio Ricerca Ca'Foscari

Edmund Spenser

The morphology of the active layer
in polymer:fullerene solar cells
is a key parameter in determining their performance. In this study
we monitor the charge carrier dynamics in bilayers of poly­(3-hexylthiophene)
(P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) (fabricated
by sequential spin coating and vacuum deposition) before and after
thermal annealing, and compare these against conventional solution
processed bulk heterojunction (BHJ) blend films. Transmission electron
microscopy images, supported by field effect mobility data show that
while not-annealed P3HT/PC<sub>61</sub>BM bilayers possess a sharp
interface, intermixing proceeds upon annealing. Transient absorption
studies indicate that the not-annealed bilayer yields fewer, but longer
lived, charge carriers compared to the BHJ. Monte Carlo (MC) simulations
further suggest that the difference in non-geminate recombination
dynamics observed for the BHJ and bilayer films could be related to
the confinement of charge carriers to the interface, with the lower
dimensionality for the flat interface bilayer films relative to the
intercalated donor–acceptor network BHJ films leading to lower
recombination

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Correlating
Non-Geminate Recombination with Film Structure:
A Comparison of Polythiophene: Fullerene Bilayer and Blend Films

https://figshare.com/articles/Correlating_Non_Geminate_Recombination_with_Film_Structure_A_Comparison_of_Polythiophene_Fullerene_Bilayer_and_Blend_Films/2043294

Edmund Spenser

Abstract

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