AlGaAs/GaAs heterojunction solar cells having conversion efficiencies greater than 19% have been produced on large-area substrates (13 cm2) using the organometallic-sourced VPE process. At 1 sun (simulated AM2) these devices have open-circuit voltages of 1.01 V and short-circuit currents of 20.9 mA/cm2. In sunlight at a flux concentration of 933 suns at AM2.1, a conversion efficiency of 19% and a fill factor of 0.757 was measured.
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Nelson et al. (1978) studied this question.
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