GaAs photovoltaics and optoelectronics using releasable multilayer epitaxial assemblies

Area of Science:

• Materials Science and Engineering
• Semiconductor Physics
• Nanotechnology

Background:

• Compound semiconductors, such as gallium arsenide (GaAs), offer superior electronic and optical properties compared to silicon.
• High cost and integration challenges limit the widespread application of GaAs in large-area formats on diverse substrates like glass or plastic.
• Existing methods for growing and integrating GaAs are expensive and not suitable for all application formats.

Purpose of the Study:

• To develop a cost-effective method for producing high-quality compound semiconductor films.
• To enable the integration of GaAs and related materials onto foreign substrates, including silicon, glass, and plastic.
• To demonstrate the feasibility of this approach for various electronic and optoelectronic applications.

Main Methods:

• Growth of thick, multilayer epitaxial assemblies of gallium arsenide (GaAs) or aluminum gallium arsenide (AlGaAs).
• Separation of these grown films from the original wafer.
• Printing of the separated semiconductor films onto foreign substrates.

Main Results:

• Demonstrated the successful fabrication of GaAs-based metal semiconductor field-effect transistors and logic gates on glass substrates.
• Developed near-infrared imaging devices integrated on silicon wafers using the printing method.
• Created efficient photovoltaic modules on plastic sheets, showcasing versatility across different applications and substrates.

Conclusions:

• The developed printing technique significantly reduces the cost and complexity of integrating high-performance compound semiconductors.
• This method enables the use of GaAs in applications previously limited by cost, format, or substrate compatibility.
• The ability to reuse the original wafer further enhances the economic viability and scalability of this semiconductor fabrication approach.