Photovoltaic devices with electroplated metal grids
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H01L-031/0224
H01L-031/18
H01L-031/068
H01L-031/0747
출원번호
US-0045163
(2013-10-03)
등록번호
US-9461189
(2016-10-04)
발명자
/ 주소
Fu, Jianming
Heng, Jiunn Benjamin
Beitel, Christopher J.
Xu, Zheng
출원인 / 주소
SolarCity Corporation
대리인 / 주소
Yao, Shun
인용정보
피인용 횟수 :
0인용 특허 :
98
초록▼
One embodiment of the present invention provides a solar cell. The solar cell includes a photovoltaic structure and a front-side metal grid situated above the photovoltaic structure. The front-side metal grid also includes one or more electroplated metal layers. The front-side metal grid includes on
One embodiment of the present invention provides a solar cell. The solar cell includes a photovoltaic structure and a front-side metal grid situated above the photovoltaic structure. The front-side metal grid also includes one or more electroplated metal layers. The front-side metal grid includes one or more finger lines, and each end of a respective finger line is coupled to a corresponding end of an adjacent finger line via an additional metal line, thus ensuring that the respective finger line has no open end.
대표청구항▼
1. A solar cell, comprising: a photovoltaic structure; anda first metallic grid positioned on a first side of the photovoltaic structure, wherein the first metallic grid includes one or more finger lines, wherein ends of a first finger line are coupled to corresponding ends of an adjacent finger lin
1. A solar cell, comprising: a photovoltaic structure; anda first metallic grid positioned on a first side of the photovoltaic structure, wherein the first metallic grid includes one or more finger lines, wherein ends of a first finger line are coupled to corresponding ends of an adjacent finger line via two metal lines, wherein the first finger line, the adjacent finger line, and the metal lines form a loop. 2. The solar cell of claim 1, wherein a respective metal line is located near an edge of the solar cell, and wherein the metal line has a width that is larger than a width of the first finger line. 3. The solar cell of claim 1, wherein the first metallic grid further includes one or more electroplated metal layers and a metal adhesive layer situated between the electroplated metal layers and the photovoltaic structure, wherein the metal adhesive layer further comprises one or more of: Cu, Al, Co, W, Cr, Mo, Ni, Ti, Ta, titanium nitride, titanium tungsten, titanium silicide, titanium silicon nitride, tantalum nitride, tantalum silicon nitride, nickel vanadium, tungsten nitride, and their combinations. 4. The solar cell of claim 3, wherein the photovoltaic structure comprises a transparent conductive oxide layer, and wherein the metal adhesive layer is in direct contact with the transparent conductive oxide layer. 5. The solar cell of claim 3, wherein the electroplated metal layers include one or more of: a Cu layer;an Ag layer; anda Sn layer. 6. The solar cell of claim 3, wherein the first metallic grid further includes a metal seed layer positioned between the electroplated metal layers and photovoltaic structure. 7. The solar cell of claim 6, wherein the metal seed layer is formed using a physical vapor deposition (PVD) technique, including one of: evaporation and sputtering deposition. 8. The solar cell of claim 1, wherein a predetermined edge portion of the first finger line has a width that is larger than a width of a center portion of the first finger line. 9. The solar cell of claim 1, wherein the photovoltaic structure includes: a base layer comprising Si; andan emitter layer positioned on a first side of the base layer, wherein the emitter layer includes at least one of: regions diffused with dopants located within the base layer;a poly Si layer diffused with dopants positioned on the first side of the base layer; anda doped amorphous Si (a-Si) layer positioned on the first side of the base layer. 10. The solar cell of claim 9, wherein the dopants include one of: phosphorus; andboron. 11. The solar cell of claim 1, further comprising a second metallic grid positioned on a second side of the photovoltaic structure, wherein the second metallic grid includes one or more electroplated metal layers, wherein the second metallic grid includes one or more finger lines, and wherein an end of a second finger line is coupled to a corresponding end of an adjacent finger line via a second metal line, thus ensuring that the second finger line has no open end. 12. A metallic grid for collecting current from a photovoltaic structure, comprising: a first finger line positioned on a first surface of the photovoltaic structure;a second finger line positioned on the first surface of the photovoltaic structure, wherein the second finger line is substantially parallel to the first finger line; andshort metal lines connecting ends of the first finger line to corresponding ends of the second finger line, wherein the first finger line, the second finger line, and the short metal lines form a loop. 13. The metallic grid of claim 12, wherein a respective short metal line is located near an edge of the photovoltaic structure, and wherein the short metal line has a width that is larger than a width of the first finger line. 14. The metallic grid of claim 12, wherein the first and second finger lines include one or more electroplated metal layers and a metal adhesive layer situated between the electroplated metal layers and the photovoltaic structure, wherein the metal adhesive layer further comprises one or more of: Cu, Al, Co, W, Cr, Mo, Ni, Ti, Ta, titanium nitride, titanium tungsten, titanium silicide, titanium silicon nitride, tantalum nitride, tantalum silicon nitride, nickel vanadium, tungsten nitride, and their combinations. 15. The metallic grid of claim 14, wherein the electroplated metal layers include one or more of: a Cu layer;an Ag layer; anda Sn layer. 16. The metallic grid of claim 12, wherein a predetermined edge portion of the first finger line has a width that is larger than a width of a center portion of the first finger line. 17. The solar cell of claim 1, wherein an intersection between a respective metal line and the first finger line is rounded or chamfered. 18. The metallic grid of claim 12, wherein an intersection between a respective short metal line and the first finger line is rounded or chamfered.
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