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Optical Spectroscopy of Doped SWNTs

Hertel, Tobias (Julius-Maximilians-University, Wuerzburg, GER)

Chemical modification and doping of semiconducting carbon nanotubes plays an important role in tailoring their electronic and optical properties for applications. However, the assessment of doping levels and the associated changes of the electronic structure of SWNTs continues to present challenges for both, theory and experiment. Here we have investigated the photophysical properties of chemically and of gatedoped semiconducting single-wall carbon nanotubes (s-SWNTs) using stationary and femtosecond time-resolved spectroscopy, at the single-particle and at the ensemble levels. We compare the effects of different doping schemes on exciton- and trionphotophysics as well as for energy transport and dissipation. We also discuss the implications for different approaches to quantifying doping by optical means.

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