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HL: Fachverband Halbleiterphysik

HL 59: Goup IV elements and their compounds I

HL 59.6: Talk

Wednesday, March 13, 2013, 16:15–16:30, H15

Tubes n’ Triplets - On Excitation dynamics in (6,5)-single-wall carbon nanotubes — •Hannes Kraus¹, Florian Späth², Andreas Sperlich¹, Dominik Stich², Daniel Schilling², Tobias Hertel², and Vladimir Dyakonov^1,3 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Institute of Physical and Theoretical Chemistry, Julius Maximilian University of Würzburg, 97074 Würzburg — ³ZAE Bayern, 97074 Würzburg

Carbon nanotube research is picking up pace, as this material class provides a multitude of potential applications due to its intriguing structural, electrical and optical properties. Focusing on the latter, we present spin-sensitive photoluminescence and time-correlated single photon counting (TCSPC) studies on semiconducting (6,5)-single-wall carbon nanotubes (SWNT). For the first time, we can unambiguously identify the signatures of triplet-triplet interaction in SWNTs, using optically detected magnetic resonance (ODMR). Applying a 1D diffusion model to ODMR and TCSPC experimental data yields a triplet lifetime of (60±30) µ s. Additionally, the triplet diffusion constant was found to be very similar to the singlet excitons’, i.e. on the order of 10 cm² s⁻¹. The impact of the finding on the applications of carbon nanotubes in organic photovoltaics will be discussed.