Efficient charge extraction out of nanoscale Schottky contacts to CdS nanowires

Nano Letters
Thomas DufauxKlaus Kern

Abstract

Charge recombination dynamics in semiconductor nanostructures is of vital importance for photovoltaic or photodetector device applications. We use local photocurrent measurements to explore spatially separated drift- and diffusion-currents close to the edge of gold contacts on top of cadmium sulfide nanowires. By theoretical modeling of the experimental photocurrent profiles, the electron diffusion length and lifetime in the wires are obtained to 0.8 μm and 1 ns, respectively. In contrast to bulk devices, the nanoscale dimensions of the involved Schottky contacts enable a highly efficient charge carrier extraction from below the electrodes. This finding paves the way for designing nanostructured optoelectronic devices of improved performance.

References

Jun 6, 2003·Nature·Chris G Van de Walle, J Neugebauer
Mar 10, 2005·Nano Letters·Kannan BalasubramanianAlf Mews
Mar 16, 2007·Nano Letters·C SociD Wang
Feb 14, 2008·Nano Letters·Michael D KelzenbergHarry A Atwater
Aug 8, 2008·Nature Nanotechnology·Eduardo J H LeeKlaus Kern
Aug 5, 2010·Small·Thomas DufauxKlaus Kern

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Citations

Jan 10, 2013·Nano Letters·Pengyu FanMark L Brongersma
Jul 12, 2012·ACS Nano·Marko Burghard, Alf Mews
Mar 19, 2014·Advanced Materials·Kaimo Deng, Liang Li
Mar 14, 2013·Optics Express·Shan LiangQu-Quan Wang
Apr 25, 2018·ACS Applied Materials & Interfaces·Li WangBo-Ru Yang

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