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The quality of pn junction photodetectors made of A1o.zGao.8As has been investigated as a first step in the optimization of tandem solar cells. We have obtained 1 sun AM1.5 efficiencies of 16.1 % for 0.25 cm 2 Alo.zzGao.nAs solar cells fabricated from molecular beam epitaxy (MBE) material. This efficiency is 3.2 percentage points higher than the previously best reported efficiency of 12.9% for an Alo.2Gao.gAs solar cell fabricated from MBE material.doi:10.1063/1.103575 fatcat:oto46ss3rnan5e4lkxcpwncpdu