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US 2020/0028003 A1Published application
Solar cell, solar cell module, and solar cell manufacturing method
AssigneeKaneka Corporation
InventorsToshihiko Uto, Daisuke Adachi
Life of this patent
Estimating the term…
Abstract
A solar cell includes a crystal substrate which has a major surface on a light reception side provided with a first texture surface and a major surface on a non-light reception side provided with a second texture surface. The second texture surface occupies 20% or more of the area of the major surface on the non-light reception side.
Claims17
A solar cell comprising a crystal substrate, wherein the crystal substrate comprises:
- a frontside major surface that receives light;
- and
- a backside major surface opposite to the frontside major surface,
- wherein at least part of the frontside major surface is an uneven surface comprising a plurality of first mountains and a plurality of first valleys,
- wherein each of the first mountains has a first pointed summit, a first mountain foot, and a first slope face that is a smooth surface connected to the first mountain foot and the first summit,
- wherein at least part of the backside major surface is an uneven surface comprising a plurality of second mountains and a plurality of second valleys,
- wherein each of the second mountains has a second pointed summit, a second mountain foot, and a second slope face comprising an inflection point at a mountain side,
- wherein an angle of inclination from the second mountain foot to the mountain side differs from an angle of inclination from the mountain side to the second summit,
- wherein in a cross-section passing through the second summit and being perpendicular to the second mountain foot, a minimum angle θ[°] formed by a first imaginary straight line from the second mountain foot to the second summit and a second imaginary straight line from the second mountain foot to the inflection point at the mountain side is 1.5≤θ≤8, and
- wherein the plurality of the second mountains occupy 20% or more of an area of the backside major surface.
7 more elements
A method for manufacturing a solar cell comprising a crystal substrate, the method comprising etching a side of a backside major surface of the crystal substrate,
- wherein the etching is performed by applying a mixed solution of ozone dissolved in hydrofluoric acid to the backside major surface and an amorphous silicon layer laminated thereon,
- wherein the backside major surface is a surface opposite to a frontside major surface of the crystal substrate that receives light, and
- wherein in the mixed solution, a value XY [weight %2] obtained by multiplying a hydrofluoric acid concentration X [weight %] and an ozone concentration Y [weight %] is between 0.005 and 0.285 inclusive.
Dependencies are inferred from the claim text.