Solar module structures and assembly methods for pyramidal three-dimensional thin-film solar cells
Solar module structures and methods for assembling solar module structures. The solar module structures comprise pyramidal three-dimensional thin-film solar cells arranged in solar module structures. The pyramidal three-dimensional thin-film solar cell comprises a pyramidal three-dimensional thin-film solar cell substrate with emitter junction regions and doped base regions. The three-dimensional thin-film solar cell further includes emitter metallization regions and base metallization regions. The three-dimensional thin-film solar cell substrate comprises a plurality of pyramid-shaped unit cells. The solar module structures may be used in solar glass applications, building facade applications, rooftop installation applications as well as for centralized solar electricity generation.
1. A solar photovoltaic module structure having reduced manufacturing cost and improved conversion efficiency, comprising:
a plurality of three-dimensional monocrystalline silicon thin-film solar cells within said solar photovoltaic module structure, each three-dimensional monocrystalline silicon thin-film solar cell comprising:
a three-dimensional monocrystalline silicon thin-film solar cell substrate having an area measuring at least 125 mm×125 mm and having a set of structural surface topography features;
said set of structural surface topography features at predetermined locations on said three-dimensional monocrystalline silicon thin-film solar cell substrate comprising a plurality of discrete and isolated inverted pyramidal cavities on a light capturing surface of said three-dimensional monocrystalline silicon thin-film solar cell substrate, said plurality of discrete and isolated inverted pyramidal cavities having a pyramidal cavity height in the range of 100 to 400 microns, said discrete and isolated pyramidal cavities having sloped sidewalls and having central axes substantially perpendicular to said light capturing surface of said three-dimensional monocrystalline silicon thin-film solar cell substrate;
said sloped sidewalls further comprising a plurality of interconnected continuous ridges interspersed among and bordering said plurality of discrete and isolated pyramidal cavities and associated to construct said monocrystalline silicon thin-film solar cell substrate as a free-standing substrate, and further associated with a set of geometrical aspect ratios and dimensions, said set of dimensions comprising a ridge width ranging approximately between 0.5 to 5 microns on said light capturing side of said three-dimensional monocrystalline silicon thin-film solar cell substrate,
said three-dimensional monocrystalline silicon thin-film solar cell substrate and said set of said structural surface topography features cooperating to comprise a free standing, self supporting three-dimensional monocrystalline silicon thin-film solar cell with sufficient mechanical rigidity and resilience for assembly in said solar photovoltaic module structure, said solar photovoltaic module structure utilizing said plurality of three dimensional monocrystalline silicon thin-film solar cells with a solar efficiency of at least 23%; and base and emitter regions on said three-dimensional monocrystalline silicon thin-film solar cell substrate; and
base and emitter metallization regions on said three-dimensional monocrystalline silicon thin-film solar cell;
a top encapsulant material layer positioned on said light capturing surface of said three-dimensional monocrystalline silicon thin-film solar cell substrate,
a printed circuit board positioned on a surface other than said light capturing surface of said three-dimensional monocrystalline silicon thin-film solar cell substrate and electrically interconnecting said base and emitter metallization regions of said plurality of three-dimensional monocrystalline silicon thin-film solar cells;
a rear encapsulant layer adjacent to said printed circuit board and opposite said three-dimensional monocrystalline silicon thin-film solar cells; and
a protective back sheet adjacent said rear encapsulant layer.
2. The solar photovoltaic module structure of claim 1 , further comprising a glass layer.
3. The solar photovoltaic module structure of claim 2 , wherein said glass layer comprises a separate glass cover.
4. The solar photovoltaic module structure of claim 1 , wherein said protective back sheet comprises a Tedlar protective back sheet.
5. The solar photovoltaic module structure of claim 1 , wherein each three-dimensional monocrystalline silicon thin-film solar cell further comprises a rear mirror.
6. The solar photovoltaic module structure of claim 5 , wherein said rear mirror comprises an integrated rear mirror.
7. The solar photovoltaic module structure of claim 5 , wherein said rear mirror comprises a detached rear mirror.
8. The solar photovoltaic module structure of claim 1 , wherein each three-dimensional monocrystalline silicon thin-film solar cell further comprises a peripheral cell frame.