Reduced charge transfer exciton recombination in organic semiconductor heterojunctions by molecular doping

Felix Deschler, Enrico Da Como, Thomas Limmer, Raphael Tautz, Tillmann Godde, Manfred Bayer, Elizabeth von Hauff, Seyfullah Yilmaz, Sybille Allard, Ullrich Scherf, Jochen Feldmann

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65 Citations (Scopus)

Abstract

We investigate the effect of molecular doping on the recombination of electrons and holes localized at conjugated-polymer–fullerene interfaces. We demonstrate that a low concentration of p-type dopant molecules (<4% weight) reduces the interfacial recombination via charge transfer excitons and results in a favored formation of separated carriers. This is observed by the ultrafast quenching of photoluminescence from charge transfer excitons and the increase in photoinduced polaron density by ∼70%. The results are consistent with a reduced formation of emissive charge transfer excitons, induced by state filling of tail states.
Original languageEnglish
Article number127402
Number of pages4
JournalPhysical Review Letters
Volume107
Issue number12
Early online date14 Sep 2011
DOIs
Publication statusPublished - 16 Sep 2011

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