Comparison of Triethylgallium and Trimethylgallium Precursors for GaInP Nanowire Growth

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Abstract

Nanowire (NW) arrays containing a top segment of GaxIn1–xP are investigated, comparing NWs grown using two different Ga precursors, trimethylgallium (TMGa) and triethylgallium (TEGa). TMGa is the precursor commonly used for the particle-assisted vapor–liquid–solid (VLS) growth of GaxIn1–xP NWs. However, it shows inefficient pyrolysis at typical NW growth conditions. The use of the alternative precursor TEGa is investigated by making a direct comparison between NWs grown using TEGa and TMGa at otherwise identical growth conditions. Growth rates, resulting NW materials composition, and time-resolved photoluminescence (TRPL) lifetimes are investigated. With increasing Ga content of the NWs, the TRPL lifetimes decrease, indicating trap states that are associated with GaP. Somewhat longer TRPL lifetimes for the samples grown using TEGa indicate a lower concentration of deep trap states. For doped NWs, it is found that the strong effect of the p-type dopant diethylzinc (DEZn) on the NW composition, observed for GaxIn1–xP NWs grown using TMGa, is absent when using TEGa.

Original languageEnglish
Article number2000400
JournalPhysica Status Solidi (B) Basic Research
Volume258
Issue number2
Early online date2020 Oct 1
DOIs
Publication statusPublished - 2021

Subject classification (UKÄ)

  • Condensed Matter Physics

Keywords

  • GaInP
  • metal-organic vapor phase epitaxy
  • nanowires
  • triethylgallium
  • trimethylgallium

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