Solar module structures and assembly methods for three-dimensional thin-film solar cells
Solar module structures 210 and 270 and methods for assembling solar module structures. The solar module structures 210 and 270 comprise three-dimensional thin-film solar cells 110 arranged in solar module structures 210 and 270 . The three-dimensional thin-film solar cell comprises a three-dimensional thin-film solar cell substrate ( 124 and 122 , respectively) with emitter junction regions 1352 and doped base regions 1360 . The three-dimensional thin-film solar cell further includes emitter metallization regions and base metallization regions. The 3-D TFSC substrate comprises a plurality of single-aperture or dual-aperture unit cells. The solar module structures 270 using three-dimensional thin-film solar cells comprising three-dimensional thin-film solar cell substrates with a plurality of dual-aperture unit cells may be used in solar glass applications. The solar module structures 210 using three-dimensional thin-film solar cells comprising three-dimensional thin-film solar cell substrates with a plurality of single-aperture unit cells may be used in building façade and 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 hexagonal cavities having sidewalls and with central axes of said discrete and isolated hexagonal cavities being positioned substantially perpendicular to a light capturing surface of said three-dimensional monocrystalline silicon thin-film solar cell substrate, said discrete and isolated hexagonal cavities associated with a first set of geometrical aspect ratios and dimensions, said first set of geometrical aspect ratios comprising a ratio between height and hexagonal diagonal dimension and being approximately in the range of 0.5 to 5;
said sidewalls comprising a plurality of interconnected continuous cavity boundary walls interspersed among and bordering said plurality of discrete and isolated hexagonal cavities associated to construct said three-dimensional monocrystalline silicon thin-film solar cell substrate as a contiguous free-standing substrate and further associated with a second set of geometrical aspect ratios and dimensions, said second set of dimensions comprising cavity boundary wall widths ranging between 2 to 10 microns on said light capturing surface 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 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 utilizing said plurality of three-dimensional monocrystalline silicon thin-film solar cells with a solar cell efficiency of at least approximately 20%;
base and emitter regions on said three-dimensional monocrystalline silicon thin-firm solar cell substrate; and
base and emitter metallization regions on said base and emitter regions;
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 opposite said three-dimensional monocrystalline silicon thin-film solar cells; and
a protective back sheet adjacent to 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 peripheral cell frame.