Intra- and inter-tube exciton relaxation dynamics in high purity semiconducting and metallic single-walled carbon nanotubes

Masao Ichida (), Shingo Saito, Yasumitsu Miyata, Kazuhiro Yanagi, Hiromichi Kataura and Hiroaki Ando

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 2, 1-5

Abstract: We have measured the exciton and carrier dynamics in the high purity semiconducting (S-) and metallic (M-) single-walled carbon nanotubes (SWNTs) in the isolated and aggregated (bundled) forms. The exciton relaxation decay times are measured by using the pump-probe spectroscopy. For bundled samples, the relaxation time becomes shorter than that for isolated SWNTs sample, because of the existence of inter-tube relaxation. We estimate the relaxation rates from S-SWNT to S-SWNT and S-SWNT to M-SWNT using the decay times for isolated SWNTs, high purity S-SWNTs bundle, and doped S-SWNTs in high purity M-SWNTs bundle. For S-SWNTs, inter-tube relaxation plays an important role in the relaxation dynamics. However, for M-SWNTs, the inter-tube relaxation is not so important, and the transition energy and intensity of exciton in M-SWNTs is strongly affected by the photoexcited carriers which plays like as photo doping. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Keywords: Topical issue: Excitonic Processes in Condensed Matter; Nanostructured and Molecular Materials. Guest editors: Maria Antonietta Loi; Jasper Knoester and Paul H. M. van Loosdrecht (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1140/epjb/e2012-30610-4

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