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Proceedings Paper

Time-resolved terahertz spectroscopy of conjugated polymer/CdSe nanorod composites
Author(s): David G. Cooke; Jun Y. Lek; Frederik C. Krebs; Yeng Ming Lam; Peter Uhd Jepsen
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Paper Abstract

We report ultrafast carrier dynamics in hybrid CdSe nanorod/poly(3-hexythiophene) (P3HT) bulk heterojunction films measured by time-resolved terahertz spectroscopy, and compare to the well studied P3HT/phenyl-C61-butyric acid methyl ester (PCBM) blend. Both films show an improved peak photoconductivity compared to P3HT alone, consistent with efficient charge transfer. The photoconductivity dynamics show fast, picosecond trapping or recombination in the hybrid blend while the all-organic film shows no such loss of mobile charge over ns time scales. The ac conductivity for all samples is well described by a Kramers-Kronig compatible Jonscher-type power law with exponent between 0.5 and 1 suggesting that interchain hopping in the polymer or between nanorods occurs at frequencies higher than 3 THz immediately after photoexcitation.

Paper Details

Date Published: 1 March 2010
PDF: 9 pages
Proc. SPIE 7600, Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV, 76000H (1 March 2010); doi: 10.1117/12.840010
Show Author Affiliations
David G. Cooke, Technical Univ. of Denmark (Denmark)
Jun Y. Lek, Nanyang Technological Univ. (Singapore)
Frederik C. Krebs, Risø National Lab. (Denmark)
Yeng Ming Lam, Nanyang Technological Univ. (Singapore)
Peter Uhd Jepsen, Technical Univ. of Denmark (Denmark)


Published in SPIE Proceedings Vol. 7600:
Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV
Jin-Joo Song; Kong-Thon Tsen; Markus Betz; Abdulhakem Y. Elezzabi, Editor(s)

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