Nondestructive Evaluation of Multijunction Solar Cells for Matching Currents
Nondestructive methods determining current mismatched ratios (CMMRs) between key subcells 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...
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Veröffentlicht in: | IEEE journal of the Electron Devices Society 2019, Vol.7, p.1047-1054 |
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Sprache: | eng |
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Zusammenfassung: | Nondestructive methods determining current mismatched ratios (CMMRs) between key subcells 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/cm 2 and 10.28 mA/cm 2 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/cm 2 is still limited by the InGaP-subcell, resulting in a conversion efficiency of 27%. Together with determined short-circuit current of 15.5 mA/cm 2 for the InGaAs-subcell, a possible optimum conversion efficiency of 29.11% is expected. |
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ISSN: | 2168-6734 2168-6734 |
DOI: | 10.1109/JEDS.2019.2944571 |