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

摘要: A lattice-matched solar cell having a dilute nitride-based sub-cell has exponential doping to thereby control current-carrying capacity of the cell. Specifically with at least one nitride that variably doped base or emitter is disclosed. In embodiment, lattice matched multi junction an upper sub-cell, middle and lower in and/or partially exponentially so as improve its performance characteristics. construction, may have lowest bandgap be substrate, typically higher than while it sub-cell. The highest adjacent further embodiments, according invention comprise four, five more sub-cells which each alloys.