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Strain-Engineered Multilayer Epitaxial Lift-Off for Cost-Efficient III-V Photovoltaics and Optoelectronics.

Tuomas Haggren1, Julie Tournet2, Chennupati Jagadish1

  • 1ARC Centre of Excellence for Transformative Meta-Optical Systems, Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia.

ACS Applied Materials & Interfaces
|January 3, 2023
PubMed
Summary

A new multilayer epitaxial lift-off technique efficiently removes thin films from substrates. This scalable process reduces costs for III-V solar cells and enables flexible device fabrication.

Keywords:
Multilayer ELOchemical mechanical polishingepitaxial lift-offphotoluminescencestrain-engineered MELOtime-resolved PL

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Renewable Energy

Background:

  • Efficiently removing epitaxially grown materials is crucial for cost-effective III-V solar cells and flexible thin-film devices.
  • Current epitaxial lift-off (ELO) methods face challenges in scalability and cost.

Purpose of the Study:

  • To demonstrate a scalable multilayer epitaxial lift-off (ELO) process for III-V semiconductor films.
  • To enable the fabrication of cost-efficient, high-integrity thin-film devices, particularly solar cells.

Main Methods:

  • Development of a multilayer ELO process utilizing in-built, engineered epitaxial strain for controlled bending.
  • Demonstration of film integrity post-lift-off using photoluminescence measurements.
  • Fabrication of centimeter-scale solar cells from released films via a facile two-step process.

Main Results:

  • The multilayer ELO process is scalable in film size and number of released layers.
  • Films retain good integrity after lift-off without external strain-inducing layers.
  • Fabricated solar cells demonstrate the viability of the released films for device applications.

Conclusions:

  • The demonstrated scalable multilayer ELO process significantly reduces material costs (4-6 fold) compared to single-layer ELO.
  • This technology is highly relevant for advancing III-V photovoltaics and thin-film semiconductor applications.
  • The process facilitates the production of high-quality, flexible, and cost-effective thin-film devices.