Journal
NANO LETTERS
Volume 11, Issue 1, Pages 66-72Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1036484
Keywords
Carbon nanotube; P3HT; charge separation; molecular junction
Categories
Funding
- Engineering and Physical Sciences Research Council
- Rhodes Trust
- Engineering and Physical Sciences Research Council [GR/S83029/01, EP/H016368/1, EP/H015701/1] Funding Source: researchfish
- EPSRC [EP/H015701/1, EP/H016368/1] Funding Source: UKRI
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We have investigated the charge photogeneration dynamics at the interface formed between single-walled carbon nanotubes (SWNTs) and poly(3-hexylthiophene) (P3HT) using a combination of femtosecond spectroscopic techniques. We demonstrate that photoexcitation of P3HT forming a single molecular layer around a SWNT leads to an ultrafast (similar to 430 fs) charge transfer between the materials. The addition of excess P3HT leads to long-term charge separation in which free polarons remain separated at room temperature. Our results suggest that SWNT-P3HT blends incorporating only small fractions (1 %) of SWNTs allow photon-to-charge conversion with efficiencies comparable to those for conventional (60:40) P3HT-fullerene blends, provided that small-diameter tubes are individually embedded in the P3HT matrix.
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