Structural Properties of Wurtzite InP-InGaAs Nanowire Core-Shell Heterostructures

Research output: Contribution to journalArticle

Abstract

We report on growth and characterization of wurtzite InP-In1-xGaxAs core-shell nanowire heterostructures. A range of nanowire structures with different Ga concentration in the shell was characterized with transmission electron microscopy and X-ray diffraction. We found that the main part of the nanowires has a pure wurtzite crystal structure, with occasional stacking faults occurring only at the top and bottom. This allowed us to determine the structural properties of wurtzite In1-xGaxAs. The InP-In1-xGaxAs core-shell nanowires show a triangular and hexagonal facet structure of {1100} and {10 (10) over bar} planes. X-ray diffraction measurements showed that the core and the shell are pseudomorphic along the c-axis, and the strained axial lattice constant is closer to the relaxed In1-xGaxAs shell. Microphotoluminescence measurements of the nanowires show emission in the infrared regime, which makes them suitable for applications in optical communication.

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Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Nano Technology

Keywords

  • Nanowire, core-shell, wurtzite, X-ray diffraction, InP, InGaAs
Original languageEnglish
Pages (from-to)2462-2467
JournalNano Letters
Volume15
Issue number4
Publication statusPublished - 2015
Publication categoryResearch
Peer-reviewedYes

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