Germanium-on-Glass solar cells: fabrication and
Abstract: We report on Germanium on Glass solar cells realized by wafer bonding, layer splitting and epitaxial regrowth. We provide a detailed description of the layer transfer process and...
Ultra-thin GaAs solar cells were anodically bonded to the D263 T eco glass, creating a strong, hermetic seal, free from adhesives. The GaAs growth substrate was removed and the epitaxial layers were then processed into solar cells off the growth wafer. These devices can be operated with the glass as a substrate or superstrate.
Within the category of flat glass, various types are utilized in solar cell applications, including low-iron tempered float glass, anti-reflective coated glass, and others.
Consistent with prior studies showing intrinsic radiation tolerance of ultra-thin GaAs solar cells, no degradation of the Jsc is observed for both 500 keV electron exposure in both glass-as-superstrate and glass-as-substrate orientations, . The EOL performance of the Jsc is even slightly improved compared with the BOL performance.
Anodic bonding of thin III-V layer structures has previously been considered, , with a view to enabling off-wafer light management; however, these demonstrations employ an Al interfacial bonding layer which is non-transparent and therefore the glass cannot be orientated as a solar cell superstrate using this approach.
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