CN204424267U - Reduce the structure of back of the body passivating solar battery back side black line - Google Patents
Reduce the structure of back of the body passivating solar battery back side black line Download PDFInfo
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- CN204424267U CN204424267U CN201520004903.7U CN201520004903U CN204424267U CN 204424267 U CN204424267 U CN 204424267U CN 201520004903 U CN201520004903 U CN 201520004903U CN 204424267 U CN204424267 U CN 204424267U
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Abstract
The utility model relates to a kind of photovoltaic structure, especially a kind of structure reducing back of the body passivating solar battery back side black line.According to the technical scheme that the utility model provides, the structure of described minimizing back of the body passivating solar battery back side black line, comprises cell substrates; Be coated with passivation layer at the back side of described cell substrates, described passivation layer is printed with conductive layer, described conductive layer is by the opening on passivation layer and cell substrates ohmic contact.The utility model compact conformation, effectively can reduce the back side black line of back of the body passivating solar battery, improve the series resistance of battery, improve the conversion efficiency of battery, effectively improve the image bright-dark degree of battery under luminescence generated by light or electroluminescent checkout equipment simultaneously, safe and reliable.
Description
Technical field
The utility model relates to a kind of photovoltaic structure, especially a kind of structure reducing back of the body passivating solar battery back side black line.
Background technology
Back of the body passivating solar battery is the developing direction of crystal-silicon solar cell, by plating one deck passivating film at back of solar cell, can improve minority carrier life time, thus improves battery efficiency.In the specific implementation, if the windowed regions area of back of the body passivating solar battery is comparatively large, namely reduces the area of battery back of the body passive area, then reduce the photoelectric conversion efficiency of battery; And windowing area is less, aluminium paste and silicon can not form good ohmic contact, have " cavity " to exist, the contact resistance of impact back of the body passivation cell, if " cavity " of back of the body passivation cell produces continuously in adjacent position of windowing, and possesses certain length, this type of battery is under luminescence generated by light or electroluminescent checkout equipment, the black line region of back side strip can be formed, the performance of impact back of the body passivation cell.
Summary of the invention
The purpose of this utility model overcomes the deficiencies in the prior art, a kind of structure reducing back of the body passivating solar battery back side black line is provided, its compact conformation, effectively can reduce the back side black line of back of the body passivating solar battery, improve the series resistance of battery, improve the conversion efficiency of battery, effectively improve the image bright-dark degree of battery under luminescence generated by light or electroluminescent checkout equipment simultaneously, safe and reliable.
According to the technical scheme that the utility model provides, the structure of described minimizing back of the body passivating solar battery back side black line, comprises cell substrates; Be coated with passivation layer at the back side of described cell substrates, described passivation layer is printed with conductive layer, described conductive layer is by the opening on passivation layer and cell substrates ohmic contact.
Described conductive layer is aluminium lamination, conductive layer is provided with the bottom electrode be electrically connected with described conductive layer.Described cell substrates gathers silicon substrate, and the top in cell substrates arranges the doped region layer different from described cell substrates conduction type, is provided with the top electrode of ohmic contact in described doped region layer.
Described passivation layer is provided with the windowed thread of some parallel distributions, is formed in windowed thread in opening by laser open window, and the aperture of described opening is 25 μm ~ 50 μm.
Multiple opening forms figure of windowing over the passivation layer, described in window figure over the passivation layer in vertical shape or skewed distribution.
Window in figure what formed, opening is distributed in adjacent windowed thread.Described passivation layer is silicon nitride layer, silicon oxide layer or alumina layer.
The thickness of described passivation layer is 100nm ~ 300nm.
Advantage of the present utility model: the present invention arranges opening in the windowed thread of passivation layer, multiple opening forms figure of windowing over the passivation layer, by figure of windowing in vertically parallel or dip-parallel distribution, windowing area can be made to reduce, passivation area is able to more reservation, be beneficial to the performance of back of the body passivating solar battery, control the length that after sintering, " cavity " produces, be beneficial to the performance of back of the body passivating solar battery and the black line generation probability under reducing luminescence generated by light or electroluminescence test.
Opening can be adjacent windowed thread on interval or staggered equal distribution form, adjacent windowed thread 8 can be made not occur occurring rear " cavity " region of sintering continuously, the black line reduced under luminescence generated by light or electroluminescence test produces probability, the back side black line problem of back of the body passivating solar battery can be reduced, improve the series resistance of battery, improve the photoelectric conversion efficiency of battery, improve battery in luminescence generated by light or electroluminescent checkout equipment hypograph bright-dark degree simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the first enforcement structural representation of the utility model passivation layer uplifting window figure.
Fig. 3 is that the second of the utility model passivation layer uplifting window figure implements structural representation.
Fig. 4 is the third enforcement structural representation of the utility model passivation layer uplifting window figure.
Fig. 5 is that the 4th kind of the utility model passivation layer uplifting window figure implements structural representation.
Fig. 6 is that the 5th kind of the utility model passivation layer uplifting window figure implements structural representation.
Fig. 7 is that the 6th kind of the utility model passivation layer uplifting window figure implements structural representation.
Fig. 8 is that the 7th kind of the utility model passivation layer uplifting window figure implements structural representation.
Description of reference numerals: 1-cell substrates, 2-passivation layer, 3-conductive layer, 4-bottom electrode, 5-opening, 6-doped region layer, 7-top electrode and 8-windowed thread.
Embodiment
Below in conjunction with concrete drawings and Examples, the utility model is described in further detail.
As shown in Figure 1: in order to the back side black line of back of the body passivating solar battery effectively can be reduced, improve the series resistance of battery, improve the conversion efficiency of battery, effectively improve the image bright-dark degree of battery under luminescence generated by light or electroluminescent checkout equipment, the utility model comprises cell substrates 1 simultaneously; Be coated with passivation layer 2 at the back side of described cell substrates 1, described passivation layer 2 is printed with conductive layer 3, described conductive layer 3 is by the opening 5 on passivation layer 2 and cell substrates 1 ohmic contact.
Particularly, conductive layer 3 is printed on passivation layer 2, because passivation layer 2 is provided with some opening 5, by making the ohmic contact between conductive layer 3 and cell substrates 1 in high temperature co-firing process.Namely conductive layer 3 by opening 5 can with the rear-face contact of cell substrates 1, and after high temperature co-firing, form required ohmic contact.
Described conductive layer 3 is aluminium lamination, conductive layer 3 is provided with the bottom electrode 4 be electrically connected with described conductive layer 3.Bottom electrode 4 is electrically connected with conductive layer 3, the electric current of cell substrates 1 can be drawn by bottom electrode 4.Described passivation layer 2 is silicon nitride layer, silicon oxide layer or alumina layer, in addition, and the laminated construction that passivation layer 2 can also be formed jointly for silicon nitride layer, silicon oxide layer or alumina layer.The thickness of described passivation layer 2 is 100nm ~ 300nm.
Described cell substrates 1 gathers silicon substrate, and the top in cell substrates 1 arranges the doped region layer 6 different from described cell substrates 1 conduction type, is provided with the top electrode 7 of ohmic contact in described doped region layer 6.In the utility model embodiment, when cell substrates 1 adopts P conduction type silica-based, injected by N conductive ion, the doped region layer 6 of N conduction type is formed in the top of cell substrates 1, by forming PN junction between doped region layer 6 and cell substrates 1, the lower end of top electrode 7 is positioned at doped region layer 6 and does not contact with cell substrates 1, the upper end of top electrode 7 is positioned at outside doped region layer 6, top electrode 7 and bottom electrode 4 form two electrodes of solar cell, usually, top electrode 7 and bottom electrode 4 are silver electrode.
Described passivation layer 2 is provided with the windowed thread 8 of some parallel distributions, is formed in windowed thread 8 in opening 5 by laser open window, and the aperture of described opening 5 is 25 μm ~ 50 μm.In the utility model embodiment, opening 5 wants through passivation layer 2, and certainly, opening 5 is arranged in windowed thread 8 by the mode can also windowed by other.
Multiple opening 5 forms figure of windowing on passivation layer 2, described in window figure on passivation layer 2 in vertical shape or skewed distribution.Window in figure what formed, opening 5 is distributed in adjacent windowed thread 8.
As the schematic diagram that Fig. 2 ~ Fig. 8 is passivation layer 2 uplifting window figure, usually, when the figure on passivation layer 2 is parallel distribution, illustrate in Fig. 2, passivation layer 2 is formed the figure of windowing of the parallel distribution of three row, windowing of often arranging, the opening 5 in every bar windowed thread 8 coaxially distributes, and opening 5 is distributed in each windowed thread 8.In Fig. 3, Fig. 4 window figure and Fig. 2 similar, the figure of windowing of seven vertical parallel distributions shown in Fig. 3, has illustrated the figure of windowing of 15 vertical parallel distributions in Fig. 4.
The figure of windowing of seven vertical parallel distributions has been shown in Fig. 5, every bar is windowed in figure, opening 5 is in spaced apart in adjacent windowed thread 8, and 31 figures of windowing in vertical parallel distribution have been shown in Fig. 6, and opening 5 is distributed in adjacent windowed thread 8 equally.In Fig. 7 and Fig. 8, figure of windowing is in the parallel distribution of tilting, and now, in each figure in tilt distribution, opening 5 can be distributed in adjacent windowed thread 8.
The present invention arranges opening 5 in the windowed thread 8 of passivation layer 2, multiple opening 5 forms figure of windowing on passivation layer 2, by figure of windowing in vertically parallel or dip-parallel distribution, windowing area can be made to reduce, passivation area is able to more reservation, be beneficial to the performance of back of the body passivating solar battery, control the length that after sintering, " cavity " produces, be beneficial to the performance of back of the body passivating solar battery and the black line generation probability under reducing luminescence generated by light or electroluminescence test.
Opening 5 can be adjacent windowed thread 8 on interval or staggered equal distribution form, adjacent windowed thread 8 can be made not occur occurring rear " cavity " region of sintering continuously, the black line reduced under luminescence generated by light or electroluminescence test produces probability, the back side black line problem of back of the body passivating solar battery can be reduced, improve the series resistance of battery, improve the photoelectric conversion efficiency of battery, improve battery in luminescence generated by light or electroluminescent checkout equipment hypograph bright-dark degree simultaneously.
Claims (8)
1. reduce a structure for back of the body passivating solar battery back side black line, comprise cell substrates (1); It is characterized in that: be coated with passivation layer (2) at the back side of described cell substrates (1), described passivation layer (2) is printed with conductive layer (3), and described conductive layer (3) is by the opening (5) on passivation layer (2) and cell substrates (1) ohmic contact.
2. the structure reducing back of the body passivating solar battery back side black line according to claim 1, is characterized in that: described conductive layer (3) is aluminium lamination, conductive layer (3) is provided with the bottom electrode (4) be electrically connected with described conductive layer (3).
3. the structure reducing back of the body passivating solar battery back side black line according to claim 1, it is characterized in that: described cell substrates (1) gathers silicon substrate, top in cell substrates (1) arranges the doped region layer (6) different from described cell substrates (1) conduction type, is provided with the top electrode (7) of ohmic contact in described doped region layer (6).
4. the structure reducing back of the body passivating solar battery back side black line according to claim 1, it is characterized in that: described passivation layer (2) is provided with the windowed thread (8) of some parallel distributions, be formed in windowed thread (8) in opening (5) by laser open window, the aperture of described opening (5) is 25 μm ~ 50 μm.
5. the structure reducing back of the body passivating solar battery back side black line according to claim 4, is characterized in that: multiple opening (5) to be windowed figure in the upper formation of passivation layer (2), described in figure of windowing upper in vertical shape or skewed distribution at passivation layer (2).
6. the structure reducing back of the body passivating solar battery back side black line according to claim 5, is characterized in that: window in figure what formed, opening (5) is distributed in adjacent windowed thread (8).
7. the structure reducing back of the body passivating solar battery back side black line according to claim 1, is characterized in that: described passivation layer (2) is silicon nitride layer, silicon oxide layer or alumina layer.
8. the structure reducing back of the body passivating solar battery back side black line according to claim 1, is characterized in that: the thickness of described passivation layer (2) is 100nm ~ 300nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520004903.7U CN204424267U (en) | 2015-01-05 | 2015-01-05 | Reduce the structure of back of the body passivating solar battery back side black line |
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| CN201520004903.7U CN204424267U (en) | 2015-01-05 | 2015-01-05 | Reduce the structure of back of the body passivating solar battery back side black line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538465A (en) * | 2015-01-05 | 2015-04-22 | 无锡尚德太阳能电力有限公司 | Structure for reducing black lines on back face of back-passivated solar cell |
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2015
- 2015-01-05 CN CN201520004903.7U patent/CN204424267U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538465A (en) * | 2015-01-05 | 2015-04-22 | 无锡尚德太阳能电力有限公司 | Structure for reducing black lines on back face of back-passivated solar cell |
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