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Conference paper

Time-resolved terahertz spectroscopy of conjugated polymer/CdSe nanorod composites: [invited]

By Cooke, David1,2; Lek, Jun Y.3; Krebs, Frederik C4,5; Lam, Yeng Ming3; Jepsen, Peter Uhd1,2

Edited by Song, Jin-Joo; Tsen, Kong-Thon; Betz, Markus; Elezzabi, Abdulhakem Y.

From

Department of Photonics Engineering, Technical University of Denmark1

Teraherts Technologies and Biophotonics, Department of Photonics Engineering, Technical University of Denmark2

Nanyang Technological University3

Risø National Laboratory for Sustainable Energy, Technical University of Denmark4

Solar Energy Programme, Risø National Laboratory for Sustainable Energy, Technical University of Denmark5

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.

Language: English
Publisher: SPIE
Year: 2010
Pages: 76000H-9
Proceedings: Photonics West: Integrated Optoelectronic Devices : Ultrafast Phenomena in Semiconductors and Nanostructure Materials XIV
ISSN: 1996756x and 0277786x
Types: Conference paper
DOI: 10.1117/12.840010
ORCIDs: Krebs, Frederik C and Jepsen, Peter Uhd
Keywords

Plastsolceller Polymer solar cells Solar energy Solenergi bulk heterojunctions carrier dynamics conductivity conjugated polymers nanorods terahertz ultrafast

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