Elongated photovoltaic devices, methods of making same, and systems for making same
View Patent ↗Under one aspect, a nonplanar photovoltaic module having a length includes: (a) an elongated nonplanar substrate; and (b) a plurality of solar cells disposed on the elongated nonplanar substrate, wherein each solar cell in the plurality of solar cells is defined by (i) a plurality of grooves around the nonplanar photovoltaic module and (ii) a groove along the length of the photovoltaic module. In some embodiments, each groove of the plurality of grooves about the photovoltaic module, independently, has a repeating pattern, a non-repeating pattern, or is helical. In some embodiments, the module further includes a patterned conductor providing serial electrical communication between adjacent solar cells. In some embodiments, portions of the patterned conductor providing serial electrical communication between adjacent solar cells are within a groove of the plurality of grooves about the photovoltaic module.
1. A method of patterning a photovoltaic module comprising a nonplanar back-electrode layer around a nonplanar substrate, the method comprising:
a. scribing the nonplanar back-electrode layer thereby forming a first groove in the back-electrode that traverses a perimeter of the back-electrode a plurality of times;
b. disposing a semiconductor junction around the back-electrode layer after the scribing step (a);
c. scribing the semiconductor junction thereby forming a second groove in the semiconductor junction that traverses a perimeter of the semiconductor junction a plurality of times;
d. disposing a transparent conductor layer around the semiconductor junction after the scribing step (c);
e. scribing the transparent conductor layer thereby forming a third groove in the transparent conductor layer that traverses a perimeter of the transparent conductor layer a plurality of times; and
f. scribing the back-electrode layer, the semiconductor junction, and the transparent conductor layer along a length of the photovoltaic module thereby forming a fourth groove, wherein the fourth groove and at least one of the first groove, the second groove, and the third groove define a plurality of solar cells, wherein each solar cell in the plurality of solar cells comprises a portion of the back electrode layer bounded by the first groove and the fourth groove, a portion of the semiconductor junction bounded by the second groove and the fourth groove, and a portion of the transparent conductor layer bounded by the third groove and the fourth groove.
2. The method of claim 1 , wherein at least one of the first, second, and third grooves has a repeating pattern, a non-repeating pattern, or is helical.
3. The method of claim 1 , wherein at least one of (a), (c), and (e) is performed with one of a mechanical scriber and a laser scriber.
4. The method of claim 1 , wherein the mechanical scriber is a constant force mechanical scriber.
5. The method of claim 1 , wherein at least one of (a), (c), and (e) comprises rotating the substrate about a long axis of the substrate.
6. The method of claim 1 , wherein at least one of (a), (c), and (e) comprises moving a scribing mechanism around the photovoltaic module.
7. The method of claim 1 , wherein (f) comprises longitudinally translating the substrate.
8. The method of claim 1 , wherein (f) comprises longitudinally translating a scribing mechanism.
9. The method of claim 1 , wherein:
the first groove is a single groove in the back-electrode layer;
the second groove is a single groove in the semiconductor junction; and
the third groove is a single groove in the transparent conductor layer.
10. The method of claim 1 , wherein (f) comprises linearly scribing the back-electrode layer, the semiconductor junction, and the transparent conductor layer along the length of the photovoltaic module.
11. The method of claim 1 , wherein the disposing step (b) comprises:
disposing an absorber layer on the scribed back-electrode layer; and
disposing a junction partner layer on the absorber layer.
12. The method of claim 1 , wherein at least one of the first groove, the second groove, and the third groove is helical and is defined by:
x=r cos t
y=r sin t
z=ct
wherein t ∈ [2,2π),
r is radius of a helix defined by the first groove, the second groove, or the third groove, and
2πc is a constant giving a vertical separation of each loop in the helix defined by the at least one of the first groove, the second groove, and the third groove.
13. The method of claim 12 , wherein
r is between 10 mm and 10,000 mm, and
c is between 0.4 mm and 100 mm.
14. The method of claim 1 , wherein at least one of the first groove, the second groove, and the third groove is a space curve, wherein the space curve is formed by wrapping a two dimensional curve having a repeating pattern about the photovoltaic module.
15. The method of claim 1 , wherein a first solar cell in the plurality of solar cells is electrically connected in series to a second solar cell in the plurality of solar cells.
16. The method of claim 1 , wherein a first solar cell in the plurality of solar cells is electrically connected in parallel to a second solar cell in the plurality of solar cells.
17. The method of claim 1 , wherein the photovoltaic module is cylindrical.
18. The method of claim 1 , wherein the photovoltaic module has a cross-section that is ovoid, or an n-gon, wherein n is 3, 4, 5, or greater than 5.
19. The method of claim 1 , wherein the photovoltaic module has a cross-section that comprises an arcuate portion.
20. The method of claim 1 , wherein the photovoltaic module is characterized by a first cross-section and a second cross-section, wherein the first cross-section is bounded by a shape that is different than a shape that bounds the second cross-section.
21. The method of claim 1 , wherein the photovoltaic module has a cross-section that is circular.
22. A photovoltaic module comprising a nonplanar back-electrode around a nonplanar substrate, the photovoltaic module formed by:
a. scribing the non-planar back-electrode layer thereby forming a continuous first groove in the back-electrode that traverses a perimeter of the back-electrode a plurality of times;
b. disposing a semiconductor junction around the back-electrode layer after the scribing step (a);
c. scribing the semiconductor junction thereby forming a continuous second groove in the semiconductor junction that traverses a perimeter of the semiconductor junction a plurality of times;
d. disposing a transparent conductor layer on the semiconductor junction after the scribing step (c);
e. scribing the transparent conductor layer thereby forming a continuous third groove in the transparent conductor layer that traverses a perimeter of the transparent conductor layer a plurality of times; and
f. scribing the back-electrode layer, the semiconductor junction, and the transparent conductor layer along a length of the photovoltaic module thereby forming a fourth groove, wherein the fourth groove and at least one of the first groove, the second groove, and the third groove define a plurality of solar cells, wherein each solar cell in the plurality of solar cells comprises a portion of the back-electrode layer bounded by the first groove and the fourth groove, a portion of the semiconductor junction bounded by the second groove and the fourth groove, and a portion of the transparent conductor layer bounded by the third groove and the fourth groove.
23. The photovoltaic module of claim 22 , wherein at least one of the first, second, and third grooves has a repeating pattern, a non-repeating pattern, or is helical.
24. The photovoltaic module of claim 22 , wherein at least one of (a), (c), and (e) is performed with one of a mechanical scriber and a laser scriber.
25. The photovoltaic module of claim 22 , wherein at least one of (a), (c), and (e) is performed with a constant force mechanical scriber.
26. The photovoltaic module of claim 22 , wherein at least one of (a), (c), and (e) comprises circumferentially rotating the nonplanar substrate.
27. The photovoltaic module of claim 22 , wherein at least one of (a), (c), and (e) comprises moving a scribing mechanism around the photovoltaic module.
28. The photovoltaic module of claim 22 , wherein (f) comprises longitudinally translating the substrate.
29. The photovoltaic module of claim 22 , wherein (f) comprises longitudinally translating a scribing mechanism.
30. The photovoltaic module of claim 22 , wherein:
the first groove is a single groove in the back-electrode layer;
the second groove is a single groove in the semiconductor junction; and
the third groove is a single groove in the transparent conductor layer.
31. The photovoltaic module of claim 30 , wherein the single groove in at least one of the back-electrode layer, semiconductor junction, and transparent conductor layer has a width of between about 10 microns and about 300 microns.
32. The photovoltaic module of claim 30 , wherein the single groove in at least one of the back-electrode layer, semiconductor junction, and transparent conductor layer has a width of between about 50 microns and about 150 microns.
33. The photovoltaic module of claim 22 , wherein the fourth groove is linear.
34. The photovoltaic module of claim 22 , wherein the disposing step (b) comprises:
disposing an absorber layer on the back-electrode layer; and
disposing a junction partner layer on the absorber layer.
35. The photovoltaic module of claim 22 , wherein at least one of the first groove, the second groove, and the third groove is helical and is defined by:
x=r cos t
y=r sin t
z=ct
wherein t ∈ [2,2π),
r is radius of a helix defined by the first groove, the second groove, or the third groove, and
2πc is a constant giving a vertical separation of each loop in the helix defined by the at least one of the first groove, the second groove, and the third groove.
36. The photovoltaic module of claim 35 , wherein
r is between 10 mm and 10,000 mm, and
c is between 0.4 mm and 100 mm.
37. The photovoltaic module of claim 22 , wherein at least one of the first groove, the second groove, and the third groove is a space curve, wherein the space curve is formed by wrapping a two dimensional curve having a repeating pattern about the photovoltaic module.
38. The photovoltaic module of claim 22 , wherein the plurality of solar cells comprises at least ten solar cells.
39. The photovoltaic module of claim 22 , wherein the plurality of solar cells comprises at least fifty solar cells.