Coulomb blockade from the shell of an InP-InAs core-shell nanowire with a triangular cross section

D. J.O. Göransson, M. Heurlin, B. Dalelkhan, S. Abay, M. E. Messing, V. F. Maisi, M. T. Borgström, H. Q. Xu

Research output: Contribution to journalArticlepeer-review

7 Citations (SciVal)

Abstract

We report on growth of InP-InAs core-shell nanowires and demonstration of the formation of single quantum structures, which show the Coulomb blockade effect, over entire lengths of the nanowires. The core-shell nanowires are grown by a selective area growth technique via metal-organic vapor phase epitaxy. The as-grown core-shell nanowires are found to be of wurtzite crystals. The InP cores have a hexagonal cross section, while the InAs shells are grown preferentially on specific { 1 1 ¯ 00} facets, leading to the formation of the core-shell nanowires with an overall triangular cross section. The grown core-shell nanowires are transferred onto a Si/SiO 2 substrate and then contacted by several narrow metal electrodes. Low-temperature transport measurements show the Coulomb-blockade effect. We analyze the measured gate capacitance and single electron charging energy of the devices and demonstrate that a quantum structure which shows the Coulomb blockade effect of a many-electron quantum dot is formed over the full length of a single core-shell nanowire and consists of the entire InAs shell in the nanowire.

Original languageEnglish
Article number053108
JournalApplied Physics Letters
Volume114
Issue number5
DOIs
Publication statusPublished - 2019 Feb 4

Subject classification (UKÄ)

  • Nano Technology

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