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US 9,312,406 B2Granted
Hybrid emitter all back contact solar cell
AssigneeSunPower Corporation
InventorsPaul Loscutoff, Seung Rim
Life of this patent
Estimating the term…
Abstract
An all back contact solar cell has a hybrid emitter design. The solar cell has a thin dielectric layer formed on a backside surface of a single crystalline silicon substrate. One emitter of the solar cell is made of doped polycrystalline silicon that is formed on the thin dielectric layer. The other emitter of the solar cell is formed in the single crystalline silicon substrate and is made of doped single crystalline silicon. The solar cell includes contact holes that allow metal contacts to connect to corresponding emitters.
Claims11
An all back contact solar cell comprising:
- a single crystalline silicon substrate;
- a thin dielectric layer formed on a backside surface of the single crystalline silicon substrate;
- a first emitter of the solar cell, the first emitter of the solar cell being formed on the thin dielectric layer and comprising polycrystalline silicon doped to have a first polarity, wherein the thin dielectric layer is between the single crystal silicon substrate and the first emitter;
- a second emitter and a third emitter of the solar cell, the second and third emitters of the solar cell being formed in the single crystalline silicon substrate and comprising single crystalline silicon doped to have a second polarity opposite the first polarity, the first emitter being formed between the second and third emitters, the second and third emitters being formed starting from opposing ends of the first emitter;
- a first metal contact connected to the first emitter on a backside of the solar cell, the backside being opposite a front side of the solar cell that faces the sun during normal operation;
- a second metal contact connected to the second emitter on the backside of the solar cell;
- and
- a third metal contact connected to the third emitter on the backside of the solar cell.
5 more elements
A solar cell comprising:
- a single crystalline silicon substrate;
- a thin dielectric formed on a backside surface of the single crystalline silicon substrate;
- a first emitter of the solar cell, wherein the first emitter is on the thin dielectric and comprises doped polycrystalline silicon, wherein the thin dielectric layer is between the single crystal silicon substrate and the first emitter;
- a second emitter of the solar cell, the second emitter comprising doped single crystalline silicon and formed in the single crystalline silicon substrate;
- a third emitter of the solar cell, the third emitter comprising doped single crystalline silicon and formed in the single crystalline silicon substrate,
- wherein the first emitter is formed between the second and third emitters, the second and third emitters being formed starting from opposing ends of the first emitter.
3 more elements
Dependencies are inferred from the claim text.