CN212783465U - Back laser grooving structure of back passivation double-sided solar cell - Google Patents
Back laser grooving structure of back passivation double-sided solar cell Download PDFInfo
- Publication number
- CN212783465U CN212783465U CN202021161681.7U CN202021161681U CN212783465U CN 212783465 U CN212783465 U CN 212783465U CN 202021161681 U CN202021161681 U CN 202021161681U CN 212783465 U CN212783465 U CN 212783465U
- Authority
- CN
- China
- Prior art keywords
- laser
- solar cell
- double
- fluting
- aluminum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Photovoltaic Devices (AREA)
Abstract
The utility model discloses a two-sided solar cell back of body laser fluting structure of back passivation, including a plurality of laser fluting of distributing on the battery back side by side, every laser fluting is for being by the double-line fluting of same strip aluminium grid line cover. The utility model designs two slots under any aluminum grid line without considering the aluminum cavity, and the light spots of the two slots are distributed in a staggered mode, thus effectively reducing the distance of current transmission between adjacent light spots and reducing the current loss caused by transverse resistance; under the condition of considering the aluminum cavity, the open groove is additionally arranged under any aluminum grid line, so that the current transmission route is effectively increased, the reduction of the battery conversion efficiency caused by the blocked current transmission is reduced, and the battery conversion efficiency is improved.
Description
Technical Field
The utility model relates to a solar cell preparation technique, in particular to two-sided solar cell back of body laser fluting structure of back passivation.
Background
Solar cells have been developed to date with two well-recognized trends, the first being high efficiency and the second being low cost. The PERC cell and the PERL cell, which are representative high-efficiency cells, can effectively reduce the manufacturing cost of the cells by reducing the thickness of silicon wafers of the PERC cell and the PERL cell. However, the reduction of the thickness of the silicon wafer can lead to the aggravation of minority carrier surface recombination, so how to reduce the thickness and ensure the conversion efficiency of the battery to be not affected is a hot topic which is currently concerned.
SiNxThe film is used as an insulating passivation layer and can protect Al when being deposited on the back surface of the battery2O3The layer is not damaged by high temperature and can release H+And the dangling bonds on the back surface are neutralized, so that the surface recombination rate of carriers is reduced, and the minority carrier lifetime is prolonged.
In addition, local back contact is one of the core technologies of PERC and PERL, two efficient batteries. The laser ablation windowing method is widely applied to elimination of the insulation passivation layer as a simple method. Among other things, the windowing ratio is one of the key factors affecting the battery Voc. When the windowing is smaller, the contact between metal and a silicon wafer is less, and the ohmic contact between metal and a semiconductor is poor, so that Rs is increased and FF is reduced; when the window is large, the area of the passivation film to be damaged is large, and Voc is greatly reduced. Recently, the low window ratio method with low resistance aluminum paste has attracted much attention because of the ability to achieve good ohmic contact at low window ratio.
However, in the current stage, the double-sided back laser windowing pattern is basically designed by adopting a single laser scribing line under a single aluminum grid line, and the difference mainly focuses on the difference of the spot size, the spot spacing and the filling spacing, so that the windowing ratio and the battery efficiency are influenced. Aluminum voids are a common defect in PERC and PERL cells. When the aluminum holes exist, the current transmission between the adjacent light spots is blocked, the transverse current transmission resistance is increased, and the important adverse effect on the battery conversion efficiency is generated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an effectively reduce the aluminium cavity to the harmful effects of battery performance, can promote battery conversion efficiency's two-sided solar cell back of body laser fluting structure of back passivation.
The purpose of the utility model is realized through the following technical measures: a back laser grooving structure of a back passivation double-sided solar cell comprises a plurality of laser grooving lines distributed on the back of the cell in parallel, and is characterized in that each laser grooving line is a double-line grooving line covered by the same aluminum grid line.
The utility model designs two slots under any aluminum grid line without considering the aluminum cavity, and the light spots of the two slots are distributed in a staggered mode, thus effectively reducing the distance of current transmission between adjacent light spots and reducing the current loss caused by transverse resistance; under the condition of considering the aluminum cavity, the open groove is additionally arranged under any aluminum grid line, so that the current transmission route is effectively increased, the reduction of the battery conversion efficiency caused by the blocked current transmission is reduced, and the battery conversion efficiency is improved.
The distance between the two-line slots of the utility model is 30-70 μm.
The utility model discloses laser fluting window ratio is 0.6 ~ 1.6%.
The back surface passivation double-sided solar cell back laser grooving structure is arranged on a PERC cell or a PERL cell.
Used laser facula size of laser fluting is 35 ~ 45 mu m, and the facula interval is 200 ~ 500 mu m.
Compared with the prior art, the utility model discloses the effect that is showing as follows has:
the utility model discloses under the condition of considering the aluminium cavity, add a fluting under arbitrary aluminium grid line and effectively increased current transmission's route, reduce because of the obstructed battery conversion efficiency who brings of current transmission reduces to promote battery conversion efficiency.
A second compared with the prior art, the utility model discloses under the condition of not considering the aluminium hole, design two flutings under arbitrary aluminium grid line, two grooved faculas are dislocation mode and distribute, can effectively reduce current transmission's between adjacent facula distance, reduce the current loss that transverse resistance brought.
The utility model is suitable for an any back laser that needs carries out is windowed and is realized the back passivation double-sided solar cell of back local contact, only needs the low resistance aluminium thick liquid of collocation when using, can realize the good ohmic contact under the low window ratio of windowing, consequently, the utility model discloses be fit for extensive the popularization.
Drawings
The present invention will be described in further detail with reference to the following drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
As shown in fig. 1, it is a back laser grooving structure for a back passivation double-sided solar cell, comprising a plurality of laser grooving 4 distributed on the back of the cell 1 side by side, wherein each laser grooving 4 is a double- line grooving 2, 3 covered by the same aluminum grid line. The distance h between the double- line slots 2 and 3 is 30-70 mu m. The window opening ratio of the laser grooving is 0.6-1.6%.
The laser morphology can be realized by adjusting LSR machine parameters, including engraving speed, frequency, power, virtual-to-real ratio, filling space, array number, odd-even line offset.
The engraving speed of the back laser windowing pattern is 35000-50000 mm/s, the frequency is 50-200 KHZ, the power is 20-35W, the virtual-real ratio is 1: 1.5-1: 2.5, the spot size is 35-45 μm, the spot spacing is 200-500 μm, the filling spacing is 0.5-1 mm, the array number is 150-250, and the odd-even row offset is-0.6 mm.
The utility model discloses back passivation double-sided solar cell back of body laser fluting structure can be applicable to any back passivation double-sided solar cell that need carry out back laser and window and realize back local contact, especially sets up on PERC battery and PERL battery.
The embodiments of the present invention are not limited to the above, according to the above-mentioned contents of the present invention, according to the common technical knowledge and the conventional means in the field, without departing from the basic technical idea of the present invention, the present invention can also make other modifications, replacements or changes in various forms, all falling within the scope of the present invention.
Claims (4)
1. The utility model provides a two-sided solar cell back of body laser fluting structure of back passivation, includes a plurality of laser fluting of distributing side by side on the battery back, its characterized in that: each laser grooving is a double-line grooving covered by the same aluminum grid line, and the windowing ratio of the laser grooving is 0.6-1.6%.
2. The backside passivated bifacial solar cell back laser trenching structure of claim 1 wherein: the distance between the double-line slots is 30-70 mu m.
3. The backside passivated bifacial solar cell back laser trenching structure of claim 2 wherein: the back laser grooving structure of the back passivation double-sided solar cell is arranged on the PERC cell or the PERL cell.
4. The backside passivated bi-planar solar cell back laser trenching structure of claim 3 wherein: the laser spot size for laser grooving is 35-45 mu m, and the spot spacing is 200-500 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021161681.7U CN212783465U (en) | 2020-06-22 | 2020-06-22 | Back laser grooving structure of back passivation double-sided solar cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021161681.7U CN212783465U (en) | 2020-06-22 | 2020-06-22 | Back laser grooving structure of back passivation double-sided solar cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212783465U true CN212783465U (en) | 2021-03-23 |
Family
ID=75074774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021161681.7U Active CN212783465U (en) | 2020-06-22 | 2020-06-22 | Back laser grooving structure of back passivation double-sided solar cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212783465U (en) |
-
2020
- 2020-06-22 CN CN202021161681.7U patent/CN212783465U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103489934B (en) | Local aluminum back surface field solar cell of a kind of transparent two sides and preparation method thereof | |
| CN112599615B (en) | A kind of N-type Topcon battery with double-sided aluminum paste electrode and preparation method thereof | |
| US7863084B2 (en) | Contact fabrication of emitter wrap-through back contact silicon solar cells | |
| CN112687755B (en) | Back metal electrode of N-type TopCOn solar cell, preparation method and cell | |
| CN108735829A (en) | The p-type PERC double-sided solar batteries and preparation method thereof of back side photoelectric conversion efficiency can be promoted | |
| CN110634964A (en) | A kind of high-efficiency crystalline silicon solar cell and its preparation method | |
| CN108666374A (en) | A rear passivation matrix dot type laser grooved conductive structure | |
| CN104091842A (en) | Distributed local boron-doped double-face photoreceptive crystalline silicon solar cell and preparation method thereof | |
| CN210640258U (en) | Grid line structure, solar cell piece and stack tile subassembly | |
| CN108054221A (en) | The back side grid line structure of two-sided PERC batteries, two-sided PERC batteries and preparation method thereof | |
| CN203932078U (en) | A kind of back of the body passivation solar cell | |
| CN212783465U (en) | Back laser grooving structure of back passivation double-sided solar cell | |
| CN108269873A (en) | IBC solar cells and preparation method thereof | |
| CN108682699A (en) | A kind of preparation method of the MWT solar cell positive electrodes of low cost | |
| CN215600378U (en) | Back laser pattern of PERC double-sided battery | |
| CN217881531U (en) | P type solar cell, cell module and photovoltaic system | |
| CN211629122U (en) | Double-sided solar cell | |
| CN104091843B (en) | Back passivation solar cell and manufacturing method thereof | |
| CN112993072A (en) | PERC double-sided battery and manufacturing method thereof | |
| CN208208767U (en) | A kind of passivating back matrix point type laser slotting conductive structure | |
| CN111933727A (en) | Back electrode structure of crystalline silicon solar cell | |
| CN106298984A (en) | Solar cell | |
| CN203967096U (en) | The boron doped double-sided light sensitive crystal-silicon solar cell of distributed local | |
| CN209592054U (en) | A kind of MWT solar battery and its component | |
| US20240347651A1 (en) | Solar cell structure, method for preparing solar cell, and mask plate |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |