High-efficiency GaAlAs/GaAs heterostructure solar cells grown by metalorganic chemical vapor deposition

Abstract
High‐efficiency GaAlAs/GaAs heterostructure solar cells have been grown by metalorganic chemical vapor deposition (MO−CVD). Simulated air‐mass‐zero (AM0) short‐circuit current densities of 24.5 mA/cm2, open‐circuit voltages of 0.99 V, fill factors of 0.74, and efficiencies of 12.8% have been measured on devices without AR coatings (uncorrected for contact area). These cell structures employ a thin (∼520Å) GaAlAs : Zn window and a GaAs : Zn/GaAs : Se pn junction grown entirely by the MO‐CVD process.