In situ electrical characterization of tapered InAs nanowires in a transmission electron microscope with ohmic contacts

Journal article (2015)

Authors

C. Zhang

M. Neklyudova

L Fang External organisation

Q. Xu

H. Wang

F.D. Tichelaar

H.W. Zandbergen

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Published Date

2015

Language

English

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Abstract

The electrical properties of segments of tapered InAs nanowires (NWs) were investigated by in situ transmission electron microscopy with simultaneous I-V measurements using good ohmic contacts, thus excluding experimental artefacts as Joule heating caused by high-resistivity contacts. At low voltage the resistivity of InAs NWs with a diameter larger than 120 nm is constant (similar to 10(-2) Omega center dot cm). When the current is strongly increased a breakdown of the NW occurs close to the cathode side, whereby the main changes are an electromigration of In and a sublimation of As. The critical current density for breakdown was close to 10(6) A cm(-2) in most cases. A Joule heating and electromigration mechanism for the breakdown process is proposed.