GaAs Substrate Recycling Using in-situ Deposited NaCl Layers via Molecular Beam Epitaxy

Brelon May, JaeJin Kim, Aaron Ptak, David Young

Research output: NRELPresentation

Abstract

This work presents an alternative method to conventional III-V substrate recycling methods via growth of NaCl on nearly-lattice matched GaAs (001) substrates. Reflection high energy electron diffraction and transmission electron microscopy confirm an epitaxial relationship between the NaCl layers and the underlying GaAs. If the sample is heated too much prior to GaAs deposition, the NaCl fully desorbs from the surface. The quality of the deposition of GaAs on NaCl ranges from amorphous at low temperature to polycrystalline at intermediate temperatures. Exposure to electron beams during growth results in larger and (001) textured grains. The substrate is separated from the GaAs film in seconds via submersion in water, revealing a substrate surface comparable to the original.
Original languageAmerican English
Number of pages14
StatePublished - 2020

Publication series

NamePresented at the 47th IEEE Photovoltaic Specialists Conference (PVSC 47), 15 June - 21 August 2020

NREL Publication Number

  • NREL/PR-5900-77001

Keywords

  • electron beams
  • epitaxy
  • GaAs
  • NaCl
  • substrate

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