Raed Sherif â Concentrated Photovoltaic for Large Scale Solar ...
Raed Sherif â Concentrated Photovoltaic for Large Scale Solar ...
Raed Sherif â Concentrated Photovoltaic for Large Scale Solar ...
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INTENSITY (ARB UNITS)Drawing Not To <strong>Scale</strong>Multijunction PVSunlight1.0TOP CELLA/R*ContactA/R*0.80.60.40.2MIDDLE CELLGaInP 2 GaInAs Ge00.25 0.45 0.65 0.85 1.05 1.25 1.45 1.65 1.85WAVELENGTH (Microns)Picture courtesy of SpectrolabBOTTOM CELLTop Cell: GaInP 2Tunnel JunctionMiddle Cell: GaInAsTunnel JunctionBottom Cell: GeGe SubstrateContact*A/R: Anti-Reflective Coating• State of the art is the 3J cell• Typical 3J cell contains 20 layers or more• Divides the solar spectrum (l < 1.750 mm) to maximize efficiency
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