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US 11,456,391 B2Granted
Solar cell
AssigneeLG Electronics Inc.
InventorsJaewon Chang, Kyungjin Shim, Hyunjung Park, Junghoon Choi
Life of this patent
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Abstract
A solar cell includes a silicon substrate, an emitter area formed on a front surface of the silicon substrate, a tunneling oxide layer formed on a back surface of the silicon substrate, a back surface field area formed on the tunneling oxide layer and formed of a polycrystalline silicon layer, a back passivation film formed on the back surface field area and having an opening, and a back electrode connected to the back surface field area via the opening.
Claims19
A solar cell comprising:
- a monocrystalline silicon substrate;
- an emitter area formed inside of a front surface of the monocrystalline silicon substrate;
- a tunneling oxide layer formed directly on the monocrystalline silicon substrate;
- a polycrystalline silicon back surface field area formed directly on the tunneling oxide layer;
- a front passivation film on the emitter area;
- a back passivation film formed of an insulating material and formed on the polycrystalline silicon back surface field area;
- a front electrode directly connected to the emitter area by penetrating through the front passivation film;
- and
- a back electrode directly connected to the polycrystalline silicon back surface field area through an opening of the back passivation film,
- wherein a thickness of the polycrystalline silicon back surface field area is about 50 nm to 500 nm;
- wherein the thickness of the polycrystalline silicon back surface field area being about 50 nm to 500 nm is provided when a crystalline structure of the polycrystalline silicon back surface field area being different from that of the monocrystalline silicon substrate and that of the emitter area.
8 more elements
Dependencies are inferred from the claim text.