Patent ID: 8637759
Filing Date: 2014-01-28
Classification: H01L,Y02E,Y02P

Abstract:
1. A solar device, comprising: a multijunction solar cell structure having at least a first subcell and a second subcell, wherein the first subcell comprises a first junction producing current from incident photons in a first wavelength band, the second subcell comprises a second junction producing current from incident photons in a second wavelength band, and the first and second junctions are associated with a first and second theoretical current capacity, respectively, such that the first theoretical current capacity is greater than the second theoretical current capacity; and a notch filter deposited onto the multijunction solar cell structure, wherein the notch filter has a bandwidth and center frequency such that some photons in the first wavelength band are reflected to reduce heating, although the incident photons in the first wavelength band provide sufficient current so that the first theoretical current capacity of the first junction is about equal to the second theoretical current capacity of the second junction, while not reducing the current produced from the second junction.