Batteries: thermoelectric and photoelectric – Photoelectric – Cells
Reexamination Certificate
2004-06-15
2010-10-05
Neckel, Alexa D. (Department: 1795)
Batteries: thermoelectric and photoelectric
Photoelectric
Cells
C136S261000, C136S255000
Reexamination Certificate
active
07807921
ABSTRACT:
A multijunction solar cell includes a first photoactive subcell layer having a first-subcell lattice parameter and a composition including (a) at least one Group III element, at least one Group V element other than (nitrogen, phosphorus), and (nitrogen, phosphorus), or (b) a material selected from the group including GaInAsBi, GaInAsSb, GaInAsP, ZnGeAs2, or BGaInAs. The multijunction solar cell also has a substrate having a substrate lattice parameter different from the first-subcell lattice parameter, and a composition-graded buffer layer between the first photoactive subcell layer and the substrate and having a buffer-layer lattice parameter graded between the first-subcell lattice parameter and the substrate lattice parameter. The substrate may be a second photoactive subcell layer having a second-subcell lattice parameter different from the first-subcell lattice parameter and sensitive to a second-photoactive-subcell-layer wavelength, and the buffer layer is transparent to the second-photoactive-subcell-layer wavelength.
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Colter Peter C.
Fetzer Christopher M.
King Richard R.
Berdichevsky Miriam
McNees Wallace & Nurick LLC
Neckel Alexa D.
The Boeing Company
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