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Increasing the Photocurrent of a Ga(In)As Subcell in Multijunction Solar Cells Based on GaInP/Ga(In)As/Ge Heterostructure
摘要： Spectral characteristics of the Ga(In)As subcell of triple-junction GaInP/Ga(In)As/Ge solar cells have been experimentally and theoretically studied. It is established that the use of a wide-bandgap “window” layer with optimum thickness (100 nm for Ga0.51In0.49P, 110 nm for Al0.4Ga0.6As, and 115 nm for the Al0.8Ga0.2As) in Ga(In)As subcell allows the response photocurrent to be increased by about 0.5 mA/cm2; the change of material in the rear potential barrier of the GaInP subcell from Al0.53In0.47P to p+-Ga0.51In0.49P or AlGaAs allows the short-circuit current of Ga(In)As subcell to be additionally increased by about 0.8 mA/cm2; and the use of a wide-bandgap n++-Ga0.51In0.49P layer instead of n++-GaAs in the tunnel diode increases the photocurrent by about 1 mA/cm2.
关键词： subcell,gallium arsenide,mathematical modeling,photocurrent,solar cell
更新于2025-09-16 10:30:52
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Nondestructive Evaluation of Multijunction Solar Cells for Matching Currents
摘要： Nondestructive methods determining current mismatched ratios in a multijunction solar cell were proposed in view of a compensated concept of subcell’s current. Various compensated lights were employed to determine key CMMR of InGaP-InGaAs-Ge related triple-junction (3J) solar cells. When a 405 nm compensated light is used, short-circuit currents of 9.37 mA/cm2 and 10.28 mA/cm2 were determined for the InGaP-subcell and InGaAs-subcell, respectively, resulting in a CMMR of 4.4%. Excellent agreement in evaluated properties was obtained when a 532 nm, a 638 nm, and 808 nm compensated lights were used. A 3J solar cell fabricated with an anti-reflected coating was also evaluated. Measured results reveal that an overall short-circuit current of 13.5 mA/cm2 is still limited by the InGaP-subcell, resulting in a conversion efficiency of 27%. Together with determined short-circuit current of 15.5 mA/cm2 for the InGaAs-subcell, a possible optimum conversion efficiency of 29.11% is expected.
关键词： solar cell,quantum efficiency,subcell,current-match,Conversion,multijunction
更新于2025-09-11 14:15:04