Scientists reached 44.5 percent efficiency with CPV

Scientists at the School of Engineering and Applied Science at the George Washington University in Washington, DC, have designed a prototype for a new concentrator solar cell. Using transfer printing, a Gallium-Arsenide- (GaAs-) based triple junction cell is stacked mechanically with Gallium-Antimon- (GaSb-) based materials to create a four-terminal, five junction cell.
The cell is assembled in a mini-module with a geometric concentration ratio of 744 suns on a two-axis tracking system and demonstrated a combined module efficiency of 41.2 percent, measured outdoors in Durham, North Carolina. Taking into account the measured transmission of the optics, the researchers determined a cell efficiency of 44.5 percent. The results are published in »Advanced Energy Materials« (»GaSb-based Solar Cells for Full Solar Spectrum Energy Harvesting«). An independent confirmation of the results has not been stated.
The world record for a multijunction concentrator cell is held by French company Soitec and research institute CEA Leti together with German Fraunhofer ISE with a jointly developed cell which reached 46 percent efficiency at 508 suns. The record was confirmed by Japanese National Institute of Advanced Industrial Science and Technology (AIST).

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