The best CdTe cells to date have been manufactured by an atomic layer epitaxy process that uses a graded junction to enhance current collection. These cells have an AMO efficiency of about 11.2%. A production run of 20 kW of large area CdTe modules was done for SERI by Photon Energy Co., using electrode posited CdTe and a thinned CdS window. The best efficiencies for modules of this design are about 9.8% (AMO).[Landis, 1991] The typical electric characters of solar cell for space use is shown in Figure 7.1 and Figure 7.2.[Nozette, 1992] Figure 7.1 Array El lciency vs Time [Nozette, 1992] Figure 7.2 Array Power vs Temperature [Nozette, 1992]
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