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Portrait of Arkady Yartsev. Photo: Kennet Ruona

Arkady Yartsev

Researcher

Portrait of Arkady Yartsev. Photo: Kennet Ruona

Ultrafast Terahertz Photoconductivity of Bulk Heterojunction Materials Reveals High Carrier Mobility up to Nanosecond Time Scale.

Author

  • Carlito Ponseca
  • Arkady Yartsev
  • Ergang Wang
  • Mats R Andersson
  • Dimali Vithanage
  • Villy Sundström

Summary, in English

The few-picosecond (ps) decay of terahertz (THz) photoconductivity typically observed for conjugated polymer:fullerene blends (at excitation fluencies ∼10(15) photons/cm(2) per pulse) is shown to be a result of charge pair annihilation for two polymer:PCBM blends. At a factor of 100 lower excitation density, the THz decay is in the hundreds of ps time scale, implying that very high carrier mobility (∼0.1 cm(2) V(-1) s(-1)) prevails for long time after charge formation, of importance for free charge formation in organic solar cells.

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2012

Language

English

Pages

11836-11839

Publication/Series

Journal of the American Chemical Society

Volume

134

Issue

29

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1520-5126