Solar Junction Technology

Concentrating Photovoltaics (CPV) delivers industry-best efficiency by utilizing low-cost optics and precise 2-axis tracking to concentrate light onto the highest-efficiency solar cells. The optics of a CPV system are like a magnifying glass, collecting light and optically projecting it onto a small, highly efficient solar cell. These systems integrate a solar cell that in the case of Solar Junction, deliver efficiencies over 40 percent, resulting in system efficiencies of 28 percent or higher. CPV systems are being deployed due to their ability to produce energy at the lowest cost of energy in regions of high solar resource. Additionally, CPV provides the following benefits compared to other photovoltaic technologies:

  • Maximum energy harvesting during peak power demand
  • Systems provide maximum efficiency, yielding the most efficient land use
  • Regions of high solar resource are typically areas of high average temperatures

By comparison flat panel modules, including silicon and thin films, vary in efficiency, but are based upon the cell technology that ranging from less than 10 percent to an absolute maximum of 22%. Best available cells, in a panel provide approximately 17% efficiency.

High-Efficiency Solar Cells

CPV can harvest more energy and become a leading power-generating technology in regions of high solar resource. At the heart of a CPV system is a high-efficiency, multi-junction solar cell. These cells were originally developed to power satellites in space and more recently modified for terrestrial applications. The efficiency of a multi-junction solar cell provides CPV module manufactures the ability to generate the highest possible energy with the reliability needed for long term projects. CPV’s path to grid parity and beyond (equivalent cost of energy versus existing fossil fuel sources) is driven by constant improvement in cell efficiencies.

Solar Junction - Enabling Solutions

Solar Junction is commercializing our proprietary Adjustable Spectrum Lattice Matched (A-SLAM™) multi-junction solar cell architecture. The A-SLAM™ architecture provides material bandgap tunability – particularly from 0.8 to 1.42 eV - to maximize the absorbed sunlight within CPV modules, thereby increasing the efficiency and energy harvested. This unique and proprietary adjustable spectrum technology is the basis of our performance leadership throughout the next decade of increasingly efficient and industry leading cells. Our technology’s capability to adapt to customer’s optics and deployment location ensures the most efficient CPV systems are installed around the world. While simultaneously enabling the industry-leading roadmap, the A-SLAM™ architecture maintains the lattice-matched paradigm, in which interatomic spacing is constant throughout the entire crystalline material stack, and has been the foundation of semiconductor and multi-junction solar cell reliability for decades. Furthermore, Solar Junction has achieved breakthroughs with our ultra-concentration tunnel junctions, allowing cells to perform optimally at 1000-1300 sun concentrations and far beyond. Solar Junction’s A-SLAM™ uniquely provides CPV system manufacturers the foundation to deliver the most efficient conversion of solar to electrical energy over 25 to 30 year project lifetimes.


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