Solar cell capable of recycling a substrate and method for manufacturing the same
The present invention relates to a solar cell that can recycle a substrate, and a manufacturing method thereof. The solar cell includes: i) a plurality of nano-structures distanced from each other and extended in one direction; ii) a first conductive layer covering a first end of at least one of the plurality of nano-structures; iii) a second conductive layer distanced from the first conductive layer and covering a second end of the nano-structure; and iv) a dielectric layer disposed between the first conductive layer and the second conductive layer.
1. A solar cell comprising:
a plurality of nano-structures serially arranged along an x-y plane direction such that each of the plurality of nano-structures is spaced from each other, not contacting each other;
a first conductive layer directly covering a first end of each of the plurality of nano-structures such that the first end is located in the first conductive layer;
a second conductive layer distanced from the first conductive layer along a z-axis direction, the second conductive layer directly covering a second end of each of the plurality of nano-structures such that the second end is located in the second conductive layer;
a dielectric layer disposed between the first conductive layer and the second conductive layer such that one side of the dielectric layer contacts the first conductive layer and the other side of the dielectric layer contacts the second conductive layer, and a thickness of the dielectric layer corresponding to a distance between the one side and the other side of the dielectric layer is constant along the x-y plane direction, the dielectric layer directly contacting a portion of each of the plurality of nano-structures that connects the first end and the second end;
a transparent contact layer directly contacting the first conductive layer;
a first contact portion formed in an upper portion of the transparent contact layer;
a second contact portion formed in an upper portion of the second conductive layer;
a first silicide layer formed at the first end of each of the plurality of nano-structures such that both the first end and the first silicide layer are located in the first conductive layer, wherein the first silicide layer is configured to function as a catalyst for growth of each of the plurality of nano-structures; and
a second silicide layer formed at the second end of the nano-structure such that both the second end and the second silicide layer are located in the second conductive layer,
wherein each of the plurality of nano-structures comprises an n-type doping area and a first p-type doping area, the first p-type doping area surrounding the n-type doping area,
wherein a first portion of the n-type doping area and a second portion of the first p-type doping area surrounding the first portion are surrounded by the second silicide layer,
wherein the first contact portion and the second contact portion are connected with a passive element such that the passive element is supplied with power using the solar cell,
wherein a highly concentrated second p-type doping area is formed in each of the plurality of nano-structures, the second p-type doping area contacting the first silicide layer and the first conductive layer, and
wherein each of the plurality of nano-structures is formed in a shape of a nano-rod that extends along the z-axis direction such that each of the plurality of nano-structures is parallel to each other.
2. The solar cell of claim 1 , further comprising:
a light transmissive layer contacting the transparent contact layer.
3. The solar cell of claim 1 , wherein the transparent contact layer comprises indium tin oxide (ITO).
4. The solar cell of claim 1 , wherein a metal nano-particle is provided on a surface of each of the plurality of nano-structures.
5. The solar cell of claim 1 , wherein each of the plurality of nano-structures comprises a first diameter contacting the first conductive layer and a second diameter contacting the second conductive layer, and the first diameter is smaller than the second diameter.
6. The solar cell of claim 5 , wherein a diameter of each nano-structure is gradually decreased as becoming closer to the first conductive layer along a length direction of the nano-structure.
7. The solar cell of claim 5 , wherein the second p-type doping area is formed in the first end of each nano-structure, and is disposed in the first conductive layer.
8. The solar cell of claim 7 , further comprising a blocking layer disposed on the first conductive layer between the plurality of nano-structures and covering the second p-type doping area.
9. The solar cell of claim 5 , further comprising another dielectric layer disposed opposite to the dielectric layer, interposing the second conductive layer therebetween.
10. The solar cell of claim 9 , wherein the other dielectric layer has a thickness of 0.5 mm to 30 mm.
11. The solar cell of claim 10 , wherein the dielectric layer and the other dielectric layer respectively comprise polydimethylsiloxane (PDMS).
12. The solar cell of claim 1 , wherein each of the plurality of nano-structures has concentration gradient along a length direction thereof.
13. The solar cell of claim 12 , wherein each nano-structure has a composition of Si 1-x Ge x (0<x≦0.5), and x is sequentially decreased as becoming close to the second conductive layer along the length direction of the nano-structure.
14. The solar cell of claim 13 , wherein each of the plurality of nano-structures has a composition of Si 1-x Ge x (0<x≦0.3).
15. The solar cell of claim 1 , further comprising a transparent conductive layer covering a surface of the plurality of nano-structures and contacting the dielectric layer and the second conductive layer.