The U.S. Department of Energy's (DOE) National Renewable Energy Laboratory (NREL) has entered into a license agreement with Microlink Devices, Inc. (Niles, IL) to commercialize NREL's patented inverted metamorphic (IMM) multijunction solar cells. »While high-efficiency multijunction solar cells are commonly used for space satellites, researchers have continued to look for ways to improve cost and performance to enable a broader range of applications,« says NREL. According to the organization, the IMM technique licensed by Microlink Devices »enables multijunction III-V solar cells to be grown with both higher efficiencies and lower costs than traditional multijunction solar cells by reversing the order in which individual sub-cells are typically grown.« The IMM architecture enables greater power extraction from the higher-bandgap sub-cells and further allows the use of more efficient low-bandgap sub-cell materials such as Indium Gallium Arsenide.
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