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High-Irradiance Degradation Studies of Metamorphic 1eV GaInAs Solar Cells

Published online by Cambridge University Press:  25 May 2012

Ryan M. France  and
Myles A. Steiner
Ryan M. France
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
Myles A. Steiner
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401
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Abstract

Initial tests are performed regarding the degradation of lattice-mismatched GaInAs solar cells. 1eV metamorphic GaInAs solar cells with 1-2×106 cm-2 threading dislocation density in the active region are irradiated with an 808 nm laser for 2 weeks time under a variety of temperature and illumination conditions. All devices show a small degradation in Voc that is logarithmic with time. The absolute loss in performance after 2 weeks illuminated at 1300 suns equivalent and 125°C is 7 mV Voc and 0.2% efficiency, showing these devices to be relatively stable. The dark current increases with time and is analyzed with a two-diode model. A GaAs control cell degrades at the same rate, suggesting that the observed degradation mechanism is not related to the additional dislocations in the GaInAs devices.

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Articles
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MRS Online Proceedings Library (OPL) , Volume 1432: Symposium G – “Reliability and Materials Issues of III-V and II-VI Semiconductor Optical and Electron Devices and Materials II” , 2012 , mrss12-1432-g05-03-ii06-03
Copyright
Copyright © Materials Research Society 2012

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References

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