M. Hjort, S. Lehmann, J. Knutsson, A.A. Zakharov, Y.A. Du, S. Sakong, R. Timm,G. Nylund, E. Lundgren, P. Kratzer, K.A. Dick, and A. Mikkelsen
Electronic and Structural Differences between Wurtzite and Zinc Blende InAs Nanowire Surfaces: Experiment and Theory
ACS Nano (2014) In Press.
We determine the detailed differences in geometry and band structure between wurtzite (Wz) and zinc blende (Zb) InAs nanowire (NW) surfaces using scanning tunneling microscopy/spectroscopy and photoemission electron microscopy. By establishing unreconstructed and defect-free surface facets for both Wz and Zb, we can reliably measure differences between valence and conduction band edges, the local vacuum levels, and geometric relaxations to the few meV and few pm levels, respectively. Surface and bulk density functional theory calculations agree well with the experimental findings and are used to interpret the results, allowing us to obtain information on both surface and bulk electronic structure. We can thus exclude several previously proposed explanations for the observed differences in conductivity of Wz-Zb NW devices. Instead, fundamental structural differences at the atomic and nanoscale that we observed between NW surface facets can explain the device behavior.
Link to the complete paper (if available):
Lunds universitet, Avdelningen för synkrotronljusfysik
Besöks- och leveransadress: Sölvegatan 14, 223 62 Lund
Postadress: Box 118, 221 00 Lund
Fakturaadress: Box 188, 221 00 Lund
OBS! Beställarens för- och efternamn måste alltid anges som referens på fakturan!
Lund University, Division of Synchrotron Radiation Research
Visiting and delivery address: Sölvegatan 14, 223 62 Lund, Sweden
Mail address: Box 118, 221 00 Lund, Sweden
Billing address: Box 188, 221 00 Lund, Sweden
Please observe that all bills have to contain the orderer's first and last name as the reference.
Phone: +46 (0)46-222 00 00, Fax: +46 (0)46-222 42 21
Webmaster: Johan Gustafson