Single Crystalline Substrates for III-V Growth via Exfoliation of Bulk Single Crystals

Andrew Norman, Adele Tamboli, William McMahon, Celeste Melamed, Eric Toberer, Brenden Ortiz, Aaron Martinez

Research output: Contribution to conferencePaper


To enable widespread deployment of GaAs PV, the cost of single crystal substrates must be dramatically reduced. Here we present an indium-bonded exfoliation technique that produces substrates for III-V growth by exfoliation of macroscopic single crystals. Beginning with a search of available substrates, we identified several model materials that are lattice matched to III-Vs. Bi 2 Se 3 single crystals were grown via the Bridgman technique in order to demonstrate our exfoliation method. From a centimeter diameter single crystal, up to eleven substrates with RMS roughness of 0.04 nm in a 20x20 micron region were exfoliated using this method. Large area AFM scans determined a terrace length of 72 um between step edges. Thicknesses were determined to range from 40-160 um using cross-sectional SEM. This exfoliation technique opens the door to the widespread study of layered materials as epitaxial substrates.
Original languageAmerican English
Number of pages4
StatePublished - 2018
Event2017 IEEE 44th Photovoltaic Specialist Conference (PVSC) - Washington, D.C.
Duration: 25 Jun 201730 Jun 2017


Conference2017 IEEE 44th Photovoltaic Specialist Conference (PVSC)
CityWashington, D.C.

NREL Publication Number

  • NREL/CP-5K00-67820


  • 2D materials
  • exfoliation
  • single crystal growth


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