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The authors review some developments in GaAs thin-film solar cells fabricated on Si substrates by MOCVD (metal-organic chemical vapor deposition). High-efficiency GaAs solar cells with an efficiency of 18% have been successfully fabricated on Si substrates by reducing the dislocation density of GaAs thin films on Si to less than 3-5*10/sup 6/ cm/sup -2/. Reduced dislocation density was attained by...
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