
194 Semiconductor Device-Based Sensors for Gas, Chemical, and Biomedical Applications
© 2011 by Taylor & Francis Group, LLC
efcient absorption near the surface of the nanowires. Once again we see an absence of the very
long time constants for recovery seen in nanowires prepared by thermal evaporation.
In conclusion, single ZnO nanowires with excellent photocurrent response and I–V characteristics
have been prepared by site-selective MBE. The I–V characteristics are linear even when measured in
the dark, and the photoconduction appears predominantly to originate in bulk conduction processes
with only a minor surface-trapping component. These de ...