Electron transport through individual Ge self-assembled quantum dots on Si

Hung Chin Chung, Wen Huei Chu, Chuan Pu Liu

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Electrical properties of self-assembled quantum dots have been the subject of intensive research due to quantum confinement. Here the authors report on the fabrication of Ge quantum dots (QDs) onto Si (100) by ultrahigh-vacuum ion beam sputtering and the electrical properties of individual QDs. Transmission electron microscopy images show that samples with completely incoherent or coherent semispherical islands can be produced under different ion energies. The current-voltage (I-V) characteristics with conductive atomic force microscopy at room temperature, exhibit linear behavior at low bias and nonlinear behavior at large bias from coherent islands, whereas the staircase structures are clearly observed in the I-V curve from incoherent islands, which are attributed to electron tunneling through the quantized energy levels of a single Ge QD.

Original languageEnglish
Article number082105
JournalApplied Physics Letters
Volume89
Issue number8
DOIs
Publication statusPublished - 2006 Sep 5

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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