Multi-junction solar cell with dilute nitride sub-cell having graded doping


Ontology type: sgo:Patent     


Patent Info

DATE

2019-07-16T00:00

AUTHORS

MISRA PRANOB , JONES-ALBERTUS REBECCA ELIZABETH , LIU TING , FUSHMAN ILYA , YUEN HOMAN B

ABSTRACT

A lattice-matched solar cell having a dilute nitride-based sub-cell has exponential doping to thereby control current-carrying capacity of the solar cell. Specifically a solar cell with at least one dilute nitride sub-cell that has a variably doped base or emitter is disclosed. In one embodiment, a lattice matched multi junction solar cell has an upper sub-cell, a middle sub-cell and a lower dilute nitride sub-cell, the lower dilute nitride sub-cell having doping in the base and/or the emitter that is at least partially exponentially doped so as to improve its solar cell performance characteristics. In construction, the dilute nitride sub-cell may have the lowest bandgap and be lattice matched to a substrate, the middle cell typically has a higher bandgap than the dilute nitride sub-cell while it is lattice matched to the dilute nitride sub-cell. More... »

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