Direct Observation of Sub-100 fs Mobile Charge Generation in a Polymer-Fullerene Film

D. G. Cooke, Frederik C Krebs, Peter Uhd Jepsen

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Abstract

The formation of mobile charges in a roll-to-roll processed poly-3-hexylthiophene-fullerene bulk heterojunction film is observed directly by using transient terahertz spectroscopy with sub-100 fs temporal resolution. The transient terahertz ac conductivity reveals that 20% of the incident pump photons are converted into highly delocalized charges within the 40 fs, 3.1 eV pump pulse duration, which then rapidly becomes localized within 120 fs. Approximately 2/3 of these carriers subsequently decay, possibly into an exciton, on a 1 ps time scale.
Original languageEnglish
JournalPhysical Review Letters
Volume108
Issue number5
Pages (from-to)056603
ISSN0031-9007
DOIs
Publication statusPublished - 2012

Bibliographical note

Copyright (2012) American Physical Society.

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