Journal article
Direct Observation of Sub-100 fs Mobile Charge Generation in a Polymer-Fullerene Film
McGill University1
Department of Energy Conversion and Storage, Technical University of Denmark2
Functional organic materials, Department of Energy Conversion and Storage, Technical University of Denmark3
Teraherts Technologies and Biophotonics, Department of Photonics Engineering, Technical University of Denmark4
Department of Photonics Engineering, Technical University of Denmark5
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.
| Language: | English |
|---|---|
| Year: | 2012 |
| Pages: | 056603 |
| ISSN: | 10797114 and 00319007 |
| Types: | Journal article |
| DOI: | 10.1103/PhysRevLett.108.056603 |
| ORCIDs: | Krebs, Frederik C and Jepsen, Peter Uhd |
