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Issue 34, 2017
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Carrier photogeneration, drift and recombination in a semiconducting carbon nanotube network

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Abstract

Charge carrier photogeneration, drift and recombination in thin film networks of polymer-wrapped (6,5)-single-wall carbon nanotubes (SWNTs) blended with phenyl-C61-butyric acid methyl ester (PCBM) have been investigated by using transient photocurrent and time-delayed collection field (TDCF) techniques. Three distinct transient photocurrent components on the nano- and microsecond timescales have been identified. We attribute the dominant (>50% of total extracted charge) ultrashort photocurrent component with a decay time below our experimental time-resolution of 2 ns to the intratube hole motion. The second component on the few microsecond timescale is attributed to the intertube hole transfer, while the slowest component is assigned to the electron drift within the PCBM phase. The hole drift distance appears to be limited by gaps in the nanotube percolation network rather than by hole trapping or recombination. Photocurrent saturation was observed when excitation densities reached more than one charge pair per nanotube; we attribute this to the local electric field screening.

Graphical abstract: Carrier photogeneration, drift and recombination in a semiconducting carbon nanotube network

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Article information


Submitted
29 May 2017
Accepted
25 Jul 2017
First published
26 Jul 2017

Nanoscale, 2017,9, 12441-12448
Article type
Paper

Carrier photogeneration, drift and recombination in a semiconducting carbon nanotube network

A. Eckstein, V. Bertašius, V. Jašinskas, I. Namal, T. Hertel and V. Gulbinas, Nanoscale, 2017, 9, 12441
DOI: 10.1039/C7NR03813E

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