High-Concentration III-V Single-Junction and Multijunction Solar Cells
We develop advanced III-V solar cell technology and share our results by publishing in high-impact journals and transferring the resulting intellectual property to industry.
We have a distinguished record of accomplishment in the field, including the invention of the original gallium indium phosphide/gallium arsenide (GaInP/GaAs) multijunction cell, its transfer to the high-efficiency cell industry, and the invention and development of inverted metamorphic multijunction (IMM) cell technology.
We have expertise in:
- Developing advanced III-V solar cell architectures for terrestrial and space applications
- Epitaxial growth and processing of ultrahigh-efficiency III-V multijunction solar cells
- Metamorphic materials science and engineering
- Growth of challenging new III-V alloys
- Characterizing and analyzing multijunction photovoltaics
- Developing and applying experimentally grounded device physics models of multijunction cell performance
- Numerical modeling of cell performance, including effects of luminescent coupling, inhomogeneous illumination, cell heating, and three-dimensional flow of electrical current
- Developing III-V photovoltaics for high-temperature operation, photoelectrochemical hydrogen production, and thermophotovoltaic structures for energy storage applications.
Tools and Capabilities
We use the following as we develop and transfer multijunction cell technology:
- Cluster tool, which comprises a metal-organic vapor-phase epitaxy growth system connected via load locks to a molecular-beam epitaxy growth system and an analytical chamber
- Two stand-alone metal-organic vapor-phase epitaxy growth systems
- Stand-alone molecular-beam epitaxy growth system
- Cleanroom in which epitaxial wafers can be processed into full devices
- Suite of cell testing techniques, including current-voltage and quantum efficiency testing of full multijunction cells
- Numerical modeling of cell performance issues relevant for incorporation into real-world systems, including inhomogeneous illumination, cell heating, and three-dimensional flow of electrical current.
SENIOR SCIENTISTMyles.Steiner@nrel.gov | 303-384-7675