Time-resolved terahertz spectroscopy of conjugated polymer/CdSe nanorod composites
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 photocondu...
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| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2014
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/101938 http://hdl.handle.net/10220/18846 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | 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. |
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