CN206976356U - A kind of MWT solar battery sheets and utilize its manufactured MWT solar cell module - Google Patents
A kind of MWT solar battery sheets and utilize its manufactured MWT solar cell module Download PDFInfo
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- CN206976356U CN206976356U CN201720510805.XU CN201720510805U CN206976356U CN 206976356 U CN206976356 U CN 206976356U CN 201720510805 U CN201720510805 U CN 201720510805U CN 206976356 U CN206976356 U CN 206976356U
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- 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
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Abstract
The utility model discloses a kind of MWT solar battery sheets, its smooth surface is provided with front electrode, shady face is provided with the front electrode contact point as negative pole and the backplate contact point as positive pole, and described front electrode contact point through the through hole of the MWT solar battery sheets with described front electrode by being connected；It is characterized in that：Described front electrode contact point is in N × N array arrangement, backplate contact point is also in N × N array arrangement, and the front electrode contact point and backplate contact point respectively arranged distributes alternately, make the front electrode contact point and backplate contact point integrally in N rows × 2N column arrays arrangement.Small using transmission loss of the solar cell module on welding made of the MWT solar battery sheets of utility model, component efficiency is high.The invention also discloses utilize MWT solar cell modules made of MWT solar battery sheets.
Description
Technical field
The utility model belongs to technical field of solar cells, and in particular to a kind of MWT solar battery sheets and using its system
Into MWT solar cell modules.
Background technology
Solar cell is a kind of semiconductor devices for converting light energy into electric energy.Low production cost and as far as possible height as far as possible
Energy conversion efficiency be always solar cell industry pursue target.Conventional solar cell negative electrode contact electrode and
Positive electrode contact electrode is located at the tow sides of cell piece respectively, wherein the coverage rate positioned at the metal electrode of battery front side is general
7% or so.Because the front of battery is smooth surface, the covering of metal electrode will cause the sunshine of a part of incidence golden
Category electrode is reflected, and causes a part of optical loss.Reduce the battery that the positive coverage rate of metal electrode can be improved directly
Energy conversion efficiency.
" metal perforate (Metal Wrap Through) battery ", abbreviation MWT battery, be a kind of negative electrode contact electrode and
Positive electrode contact electrode is all located at the battery of cell backside.In MWT battery structure, the contact electrode positioned at battery smooth surface leads to
Cross in silicon substrate body and be directed into cell backside, the extremely collected electric current of surface emitting is flowed out by the back side of battery.With tradition
Solar cell is compared, and the metal electrode of battery front side is substituted by the front electrode contact point positioned at the back side, and battery front side covers
Lid rate reduces, and receives the area increase of illumination, so as to effectively increase the short circuit current of cell piece, makes cell power conversion efficiency
It is improved.
In the encapsulation of conventional MWT solar cell modules, carried out mutually using series system between adjacent MWT battery piece
Connection, specifically includes following two modes：
(1) interconnected using welding：Welding is used by the positive contact point of a MWT battery piece and another MWT
The cathode contact point of cell piece is joined directly together.Fig. 1 shows a kind of existing common welding mutual contact mode.This method lacks
Point essentially consists in：The welding length needed is longer, and resistance is larger, causes transmission loss of the component power on welding big；Make
During with the efficient MWT battery piece that voltage is high, short circuit current is high, most of energy will be lost rather than be converted into the form of heat
Electric energy, the high conversion efficiency that battery-end obtains can not be embodied completely in assembly end.
(2) interconnected using metallic conduction substrate：I.e. using conducting resinl by the positive and negative electrode contact point of cell backside with
The good contact point of pre-production is joined directly together on metallic conduction substrate, so as to automatically form complete loop；However, metallic conduction
Substrate is not only expensive, in the case of long-term use it is also possible to exist bending, insulation the problems such as, cause component failures or work(
The problems such as rate decay is excessive.
Utility model content
First purpose of the present utility model be to provide a kind of MWT solar battery sheets, utilizes its manufactured solar energy
Transmission loss of the battery component on welding is small, and component efficiency is high.
Second purpose of the present utility model is to provide one kind using MWT made of above-mentioned MWT solar battery sheets too
Positive energy battery component.
To reach first above-mentioned purpose, the technical solution adopted in the utility model is as follows：
A kind of MWT solar battery sheets, its smooth surface are provided with front electrode, and shady face is provided with the front as negative pole
Electrode contact point and the backplate contact point as positive pole, described front electrode contact point pass through through the MWT sun
The through hole of energy cell piece is connected with described front electrode；It is characterized in that：Described front electrode contact point is in N × N array
Arrangement, backplate contact point is also arranged in N × N array, and the front electrode contact point and backplate contact point phase respectively arranged
Between be distributed, make the front electrode contact point and backplate contact point integrally in the arrangement of N rows × 2N column arrays.
Herein, " array arrangement " refers to that the arrangement of electrode contact point be multiple rows and multiple row, row it is capable between phase
It is mutually parallel, it is parallel to each other between the column and the column, it is mutually perpendicular between row and column.
Between this MWT solar battery sheets and existing MWT solar battery sheets main difference is that on shady face
Arrangement mode between front battery contact and backplate contact point：In MWT solar battery sheets of the present utility model,
Front electrode contact point and backplate contact point are integrally in the array distribution of N rows × 2N row, and the front electrode of each column contacts
Point range and backplate contact point range distribute alternately, i.e., in the array of the N rows × 2N row, the battery contact of each column is just
Face electrode contact point is backplate contact point, and the then front electrode contact to distribute alternately of often capable battery contact
Point and backplate contact point.This arrangement can make this MWT solar cell pieces be easily divided into several multiple size phases
Deng battery unit, and each battery unit has a row at the opposite side edge for being distributed in the battery unit shady face respectively just
Face electrode contact point and a row backplate contact point.When these battery units are carried out group into string, by adjacent cell
Front electrode contact point and backplate contact point are interconnected by welding.Because front electrode contact point and backplate connect
Contact is respectively positioned on the adjacent edges of battery unit, therefore uses shorter welding can to reach the interconnection between battery unit,
Loss on welding is smaller, and component efficiency is high.
Described electrode contact point can be the circular or 0.2~10mm of the length of side square of a diameter of 0.2~10mm, also may be used
For other suitable shapes.
Preferably, in the array arrangement of the overall N rows of the front electrode contact point and backplate contact point × 2N row
In, the line space of each row electrode contact point is equal, the column pitch of each row electrode contact point, is divided into wide spacing and thin space two
Kind column pitch, and arranged between the column and the column in the form of " wide spacing-thin space-wide spacing-thin space ", described wide spacing is 10
~80mm, thin space are 1~20mm, and described thin space is less than described wide spacing.
Above-mentioned is a kind of arrangement mode of the electrode contact point for MWT solar cell pieces that the utility model is recommended.Entering
, can be longitudinally cutting to cell piece progress along the center line of thin space during the cutting of the above-mentioned MWT solar cell pieces of row, so as to
It is readily available front electrode contact point and backplate contact point is located at battery unit near the two edges of battery unit.
Specifically, described MWT solar battery sheets are laminar structure, and it is wrapped successively from smooth surface to shady face direction
Include passivated reflection reducing film layer, front surface emitter layer, battery sheet matrix, combination protection film layer and back side aluminium lamination；Described smooth surface
For passivated reflection reducing film layer, described shady face is back side aluminium lamination, and the back aluminium layer surface differential trench open forms back side local back
.
Preferably, described passivated reflection reducing film layer is SiOxPassivating film and SiNxAntireflective film, its gross thickness are 65~100nm,
Refractive index is 1.9~2.3；Described front surface emitter layer is the n of certain doping concentration+Emitter junction, its square resistance are 40
~300ohm/sq；Described battery sheet matrix is p type single crystal silicon substrate, and its resistivity is 1~30 Ω cm, thickness is 50~
300 μm, the back side is burnishing surface or wet etching face, and described combination diaphragm is silica (SiOx), aluminum oxide (AlOx) and nitridation
Silicon (SiNx) etc. the two membranes that are combined into of film or trilamellar membrane system, the gross thickness of described combination protection film layer is 60~500 μm.
In the embodiment of one of the present utility model recommendation, front face electrode and the back side on described shady face connect
Touched electrode is in 4 × 4 array arrangements, makes the front electrode contact point and backplate contact point integrally in the column array of 4 rows × 8
Arrangement.This cell piece can be cut into 4 battery units.
In the embodiment of the present utility model that another is recommended, front face electrode and the back side on described shady face
It is in 8 × 8 array arrangements to contact electrode, the front electrode contact point and backplate contact point is integrally arranged in 8 rows × 16
Array arrangement.This cell piece can be cut into 8 battery units.
Above-mentioned MWT solar battery sheets can be prepared by following steps：
Step 1：Making herbs into wool is carried out to cell piece matrix surface, the cleaning of cell piece matrix surface is carried out after making herbs into wool；
Step 2：By diffusion or ion implanting, front surface emitter stage is formed in the front surface of cleaned battery sheet matrix
Layer；
Step 3：Then, the battery chip architecture through diffusion or ion implanting is subjected to wet etching or polishing, and it is right
Battery chip architecture after wet etching or polishing carries out laser or chemical attack perforate, to form through hole；
Step 4：Surface clean is carried out to the cell piece after step 3 processing, then formed again on surface by oxidation technology
Close the tunic in combined films；
Step 5：In the back surface deposition of aluminium oxide (AlO of the battery chip architecture after step 4 processingx) layer and/or oxidation
Silicon (SiOx) layer and/or silicon nitride (SiNx) layer, to form combination protection film layer；
Step 6：Passivated reflection reducing film layer is formed on the front surface emitter layer of the battery chip architecture after step 5 processing；
Step 7：Front electrode is printed on described front surface emitter layer, on the surface of described combination protection film layer
Upper perforate or fluting；
Step 8：Using grout slurry, described through hole is filled, while overleaf printing forms front electrode and connect
Contact and backplate contact point；
Step 9：Back side aluminum steel is republished on cell back surface；
Step 10：Again front electrode is printed on cell piece front surface emitter layer；
Step 11：Cell piece is sintered, to form back side local back surface field and back side aluminium lamination, and causes described front
Electrode contact point and backplate contact point form contact performance, and then obtain above-mentioned MWT solar cell pieces.
To reach second above-mentioned purpose of utility model, the technical solution adopted in the utility model is as follows：
One kind utilizes MWT solar battery sheet components made of above-mentioned MWT solar battery sheets, it is characterised in that：Including
At least two pieces battery units being split to form by above-mentioned MWT solar battery sheets, the battery unit described in every piece has to be divided respectively
The row front electrode contact point and a row backplate contact point being distributed in by the opposite side edge of the battery unit shady face；Institute
The battery unit arranged adjacent formation group string stated, each front electrode contact point of adjacent battery unit and each backplate
It is connected between contact point by welding；Positioned at described group of string one end battery unit front electrode contact point and busbar it
Between be connected by welding, between the backplate contact point and another busbar of the battery unit of the described group of string other end lead to
Welding is crossed to be connected.
From existing MWT solar cell modules different, this solar battery sheet component simultaneously indirect carries out cell piece
Series connection, but cell piece is first divided into the smaller battery unit of area, then to battery unit progress welding series connection and at both ends
Busbar is set, to realize the group string of battery unit.This way has the advantage that：
(1) area of each battery unit greatly reduces for cell piece, therefore its electric current and resistance are also relatively
It is small.The electric current and series resistance of every a string of cell pieces group string are also reduced, so as to reduce the shadow of thin grid line line resistance loss
Ring, therefore the consumption of silver paste can be reduced, while improve the fill factor, curve factor of battery and component, improve component efficiency；
(2) gap between battery unit is relatively small, so as to make full use of the useful space, improves component smooth surface
Product；The distance of welding is small, so as to reduce power loss, greatly improves component power, reduces production cost and degree electricity
Cost；
(3) without expensive metal backing, directly welded and interconnected in the same face by welding, avoided because metal backing
The problems such as bending and insulation for bringing, the reliability of solar components is improved, while also greatly reduce cost.
After formation group string, it is follow-up conflux, lamination, the module encapsulation techniques such as lamination and general components production method without
It is different.
In a kind of embodiment of recommendation of the present utility model, the front electrode contact point on all battery units
It is equal with the quantity of backplate contact point.
A kind of method for preparing above-mentioned MWT solar modules, comprises the following steps：
Step 1：Described MWT solar cell pieces are cut into the battery unit of several formed objects, made described in every piece
Battery unit have be distributed in respectively a row front electrode contact point by the opposite side edge of the battery unit shady face and
One row backplate contact point；
Step 2：By described battery unit tiling in the plane, the front electrode contact point and the back of the body of adjacent cell are made
Face electrode contact point is located close to position, and by welding by close to two battery units front electrode contact point and the back side
Electrode contact point links together, formation group string；
Step 3：Busbar, a busbar and the battery unit positioned at described group of string one end are set at described group string both ends
Front electrode contact point between be connected by welding, another busbar and the battery unit positioned at the described group of string other end
It is connected between the battery contact of the back side by welding.
Step 4：Confluxed, lamination, the module encapsulation techniques such as lamination, obtain battery component.
It is above-mentioned conflux, lamination, the module encapsulation techniques such as lamination be this area common process.
The beneficial effects of the utility model are as follows：
(1) transmission loss of this MWT solar cell modules on welding is small, and component power output is high；
(2) this MWT solar cell modules are interconnected without using metallic conduction substrate, so as to avoid metallic conduction
The problems such as bending of the substrate under long-term use, insulation, extend the service life of battery component；
(3) design of this MWT solar cells can be realized easily in MWT battery manufacturing process, to MWT battery
Performance do not have any negative effect；
(4) preparation method of this MWT solar cell modules is simple, high-quality reliable, without entering to existing subassembly line
Row is too many to be improved, and cost is cheap, and flow is simple to operation, can be applied directly in large-scale production.
Brief description of the drawings
Below in conjunction with Figure of description and specific embodiment, the utility model is further described.
Fig. 1 is a kind of interconnected in series mode of MWT battery piece in conventional MWT battery component；
Fig. 2 is the structural representation of MWT solar battery sheets of the present utility model；
Fig. 3 is the backplate version type schematic diagram of the MWT solar battery sheets of embodiment 1；
Fig. 4 is the cutting schematic diagram of the MWT solar battery sheets of embodiment 1；
Fig. 5 is the interconnection schematic diagram of the MWT solar battery cells of embodiment 1；
Fig. 6 is the stacks of cells string schematic diagram of the MWT solar cell modules of embodiment 1；
Fig. 7 is the backplate version type schematic diagram of the MWT solar battery sheets of embodiment 2.
Reference：1- front electrodes；2- passivated reflection reducings penetrate film layer；3- front surface emitter layers；4- battery sheet matrixes；5-
Back side local back surface field；6- back sides aluminium lamination；7- front electrode contact points；8- backplate contact points；9- through holes；10- combination protections
Film layer；11-MWT solar battery cells；12- weldings；13- busbars；14-MWT solar battery sheets.
Embodiment
Specific embodiment is exemplified below to illustrate the utility model.It is pointed out that following examples are served only for
The utility model is described in further detail, does not represent the scope of protection of the utility model, and other people carry according to of the present utility model
Show the nonessential modification and adjustment made, still fall within the scope of protection of the utility model.
In examples below, used battery sheet matrix is the p that is lightly doped of the resistivity in 0.1~10 Ω cm
Type monocrystalline silicon piece；Used chemical cleaning solution is the HCl and H that Jiangyin Jianghua Microelectronics Materials Co., Ltd. provides2O2
The SC2 solution being made into.Used grout slurry is Du PontTMCompanyPV701。
Embodiment 1
As figures 2-6, the MWT solar battery sheets in the present embodiment are laminar structure, and it is from smooth surface to shady face
Direction includes passivated reflection reducing film layer 2, front surface emitter layer 3, battery sheet matrix 4, combination protection film layer 10 and back aluminium successively
Layer 6；Described smooth surface is passivated reflection reducing film layer 2, and described shady face is back side aluminium lamination 6, and the surface of back side aluminium lamination 6 is local
Fluting forms back side local back surface field 5.Wherein, passivated reflection reducing film layer 2 is SiOxPassivating film and SiNxThe composite membrane of antireflective film, thickness
For 80nm；Front surface emitter layer 3 is the n of certain doping concentration+Emitter junction, its square resistance are 100ohm/sq；Battery chip base
Body 4 is p type single crystal silicon substrate, and its resistivity is 2 Ω cm, and thickness is 180 μm, and its back side is burnishing surface；Combination protection
Two layers totally of film layer 10, include aluminum oxide (AlO from smooth surface to shady face direction respectivelyx) layer and silicon nitride (SiNx) layer；Combination
The gross thickness of protection film layer 10 is 100 μm.
The smooth surface of solar battery sheet is that passivated reflection reducing film layer 2 is provided with front electrode 1, and shady face is back side aluminium lamination 6
On backplate contact point 8 as the front electrode contact point 7 of positive contact point and as cathode contact point is distributed with, front
Electrode contact point 7 is connected by the through hole 9 through this MWT solar battery sheets with front electrode 1.Front electrode on shady face
Contact point 7 is in 4 × 4 array distributions, and backplate contact point 8 is also in 4 × 4 array distributions, and the front electrode contact point 7 respectively arranged
Distributed alternately with backplate contact point 8, it is in 4 to make the front electrode contact point 7 on shady face and the entirety of backplate contact point 8
The array distribution of the row of row × 8.The line space of each row electrode contact point is equal, the column pitch of each row electrode contact point, is divided into
Two kinds of column pitch of wide spacing and thin space, and arranged between the column and the column in the form of " wide spacing-thin space-wide spacing-thin space ",
Described wide spacing is 39mm, thin space 2mm, and described thin space is less than described wide spacing.As shown in figure 3, this MWT is too
Positive energy cell piece can be cut into 4 MWT solar battery cells 11, wherein the shady face of each battery unit 11 has a row
The row backplate contact point 8 of front electrode contact point 7 and one, it is located at pair of the shady face of MWT solar battery cells 11 respectively
Side edge.
The preparation method of the MWT solar cell pieces of the present embodiment is as follows：
Step 1：Battery sheet matrix 4 is placed in texturing slot, in 0.5wt% sodium hydroxide deionized water solution and
Making herbs into wool is carried out under conditions of 75 DEG C, to form suede structure；
Step 2：Then the cleaning on the surface of battery sheet matrix 4 is carried out：Cleaned using chemical cleaning solution at 5~90 DEG C
0.5~60 minute.
Step 3：Battery sheet matrix 4 obtained by step 2 is subjected to phosphorus (P) diffusion 70min in 810 DEG C of boiler tube, prepared
Front surface emitter layer 3；
Step 4：Then, the battery chip architecture through diffusion or ion implanting is polished place in alkali polishing machine
Reason, to remove back of the body knot and phosphorosilicate glass；
Step 5：Laser beam drilling is carried out to the battery chip architecture after polished processing, to form through hole 9；
Step 6：Surface clean is carried out to cell piece, then silicon nitride in complex composition film is formed on surface by oxidation technology
(SiOx) layer；
Step 7：Again in the shady face deposition of aluminium oxide (AlO of battery chip architecturex) layer and silicon nitride (SiNx) layer, with common
Form combination protection film layer 10；
Step 8：PECVD grows SiN on the front surface emitter layer 3 of the battery chip architecture after upper step processx, shape
Film layer 2 is penetrated into passivated reflection reducing；
Step 9：Utilize method overleaf perforate or the fluting on passivating film of laser either chemical attack.Opening diameter is
10um, pitch of holes 100um.Groove width is 20um, and line spacing P1 is 500um.Also dashed lines can be used during fluting；
Step 10：Using grout slurry, the hole opened in step 3 is filled, and printed simultaneously on cell back surface
Scopiform is into front electrode contact point 7 and backplate contact point 8；
Step 11：Back side aluminum steel printing：Print aluminum steel covering perforate or slot area, aluminum steel need be direct with back electrode
Or internode connection all collects electric current.Aluminum steel width is 20um, and line spacing P2 is 500um；
Step 12：Using method for printing screen printing front electrode 1, printing on the described face of front surface emitter layer 3
Used metal is silver；
Step 13：High temperature Fast Sintering：The silicon chip printed in upper step is placed in sintering furnace and sintered, sintering temperature is
400-900℃.Front electrode 1 passes through passivated reflection reducing film layer 2 after sintered, and Ohmic contact is formed with front surface emitter layer 3；The back of the body
The silicon substrate precursor reactant of face aluminum steel and perforate or slot area forms alusil alloy and back local back surface field 5；
The step of making MWT solar cell modules using this MWT solar cell pieces is as follows：
Step 1：As shown in figure 3, the MWT solar cell pieces of one the present embodiment are divided into 4 phases using laser cutting
With the MWT solar battery cells 11 of size, there is each MWT solar battery cells 11 and be distributed in its backlight respectively
The one row front electrode contact point 7 and a row backplate contact point 8 at the opposite side edge in face；
Step 2：As shown in Figures 4 and 5, the battery unit tiling 7 obtained by the above method in the plane, makes adjacent
The front electrode contact point and backplate contact point of battery unit are located at adjacent position, and by welding 12 by adjacent two
The positive and negative electrode of battery unit links together, and sets busbar 13 at both ends, realizes the group string of battery unit；
Step 3：Group string obtained by step 2 is carried out it is conventional conflux, lamination, the module encapsulation techniques such as lamination, obtain too
Positive energy battery component.
Embodiment 2
The MWT solar cell chip architectures of the present embodiment are substantially the same manner as Example 1, and its difference is following several
Point：
(1) thickness of passivated reflection reducing film layer 2 is 100nm, refractive index 1.9；
(2) square resistance of front surface emitter layer 3 is 300ohm/sq；
(3) battery sheet matrix 4 is p type single crystal silicon substrate, and its resistivity is 1 Ω cm, and thickness is 300 μm, and it is carried on the back
Face is wet etching face；
(4) gross thickness for combining protection film layer 10 is 500 μm.
(5) as shown in fig. 7, the front electrode contact point 7 on shady face is in 8 × 8 array distributions, backplate contact point 8
Also it is in 8 × 8 array distributions, and the front electrode contact point 7 and backplate contact point 8 that respectively arrange distribute alternately, and make on shady face
Front electrode contact point 7 and the overall array distribution in the row of 8 rows × 16 of backplate contact point 8；Between electrode contact point
The wide spacing of column pitch is 19.4mm, thin space 1.5mm.
The preparation method of the MWT solar cell pieces of the present embodiment is as follows：
Step 1：Battery sheet matrix 4 is placed in texturing slot, in 5wt% sodium hydroxide deionized water solution and 90
Making herbs into wool is carried out under conditions of DEG C, to form suede structure；
Step 2：Then the cleaning on the surface of battery sheet matrix 4 is carried out：Cleaned using chemical cleaning solution at 5~90 DEG C
0.5~60 minute.
Step 3：Battery sheet matrix 4 obtained by step 2 is subjected to phosphorus (P) diffusion 150min, system in 1000 DEG C of boiler tube
Standby front surface emitter layer 3；
Step 4：Then, the battery chip architecture through diffusion or ion implanting is polished place in alkali polishing machine
Reason, to remove back of the body knot and phosphorosilicate glass；
Step 5：Laser beam drilling is carried out to the battery chip architecture after polished processing, to form through hole 9；
Step 6：Surface clean is carried out to cell piece, then silicon nitride in complex composition film is formed on surface by oxidation technology
(SiOx) layer；
Step 7：Again in the shady face deposition of aluminium oxide (AlO of battery chip architecturex) layer and silica (SiOx) layer, with common
Form combination protection film layer 10；
Step 8：PECVD grows SiN on the front surface emitter layer 3 of the battery chip architecture after upper step processx, shape
Film layer 2 is penetrated into passivated reflection reducing；
Step 9：Utilize method overleaf perforate or the fluting on passivating film of laser either chemical attack.Opening diameter is
200um, pitch of holes 11000um.Groove width is 100um, and line spacing is 2000um.Also dashed lines can be used during fluting；
Step 10：Using grout slurry, the hole opened in step 3 is filled, and printed simultaneously on cell back surface
Scopiform is into front electrode contact point 7 and backplate contact point 8；
Step 11：Back side aluminum steel printing：Print aluminum steel covering perforate or slot area, aluminum steel need be direct with back electrode
Or internode connection all collects electric current.Aluminum steel width is 2000um, and line spacing P2 is 2000um；
Step 12：Using method for printing screen printing front electrode 1, printing on the described face of front surface emitter layer 3
Used metal is silver；
Step 13：High temperature Fast Sintering：The silicon chip printed in upper step is placed in sintering furnace and sintered, sintering temperature is
400-900℃.Front electrode 1 passes through passivated reflection reducing film layer 2 after sintered, and Ohmic contact is formed with front surface emitter layer 3；The back of the body
The silicon substrate precursor reactant of face aluminum steel and perforate or slot area forms alusil alloy and back local back surface field 5；
The step of making MWT solar cell modules using this MWT solar cell pieces is as follows：
Step 1：The MWT solar cell pieces of one the present embodiment are divided into the MWT of 4 formed objects using laser cutting
Solar battery cell 11, make each MWT solar battery cells 11 that there is the opposite side side for being distributed in its shady face respectively
A row front electrode contact point 7 and a row backplate contact point 8 for edge；
Step 2：The battery unit tiling that 14 are obtained by the above method in the plane, makes adjacent cell just
Face electrode contact point and backplate contact point are located at adjacent position, and by welding 12 by two adjacent battery units just
Negative electrode links together, and sets busbar 13 at both ends, realizes the group string of battery unit；
Step 3：Group string obtained by step 2 is carried out it is conventional conflux, lamination, the module encapsulation techniques such as lamination, obtain too
Positive energy battery component.
Embodiment 3
The MWT solar cell chip architectures of the present embodiment are substantially the same manner as Example 1, and its difference is following several
Point：
(1) thickness of passivated reflection reducing film layer 2 is 65nm, refractive index 2.3；
(2) square resistance of front surface emitter layer 3 is 40ohm/sq；
(3) battery sheet matrix 4 is p type single crystal silicon substrate, and its resistivity is 30 Ω cm, and thickness is 50 μm, and it is carried on the back
Face is wet etching face；
(4) gross thickness for combining protection film layer is 60 μm；
(5) the wide spacing of the column pitch between electrode contact point is 80mm, thin space 20mm.
The preparation method of the MWT solar cell pieces of the present embodiment is the same as embodiment 1.
Claims (8)
1. a kind of MWT solar battery sheets, its smooth surface is provided with front electrode, and shady face is provided with the front electricity as negative pole
Pole contact point and the backplate contact point as positive pole, described front electrode contact point pass through through the MWT solar energy
The through hole of cell piece is connected with described front electrode；It is characterized in that：Described front electrode contact point is in N × N array row
Cloth, backplate contact point is also in N × N array arrangement, and the front electrode contact point and backplate contact point that respectively arrange are alternate
Distribution, make the front electrode contact point and backplate contact point integrally in N rows × 2N column arrays arrangement.
2. MWT solar battery sheets according to claim 1, it is characterised in that：In the front electrode contact point and the back of the body
In the array arrangement of the overall N rows of face electrode contact point × 2N row, the line space of each row electrode contact point is equal, and each row electrode connects
The column pitch of contact, it is divided into two kinds of column pitch of wide spacing and thin space, and between the column and the column with " wide spacing-thin space-wide
Spacing-thin space " form is arranged, and described wide spacing is 10 ~ 80mm, and thin space is 1 ~ 20mm, and described thin space is less than institute
The wide spacing stated.
3. MWT solar battery sheets according to claim 2, it is characterised in that：Described MWT solar battery sheets are layer
Laminated structure, its from smooth surface to shady face direction successively include passivated reflection reducing film layer, front surface emitter layer, battery sheet matrix,
Combine protection film layer and back side aluminium lamination；Described smooth surface is passivated reflection reducing film layer, and described shady face is back side aluminium lamination, described
Back aluminium layer surface differential trench open forms back side local back surface field.
4. MWT solar battery sheets according to claim 3, it is characterised in that：Described passivated reflection reducing film layer for SiOx
Passivating film and SiNxAntireflective film, its gross thickness are 65 ~ 100nm, and refractive index is 1.9 ~ 2.3；Described front surface emitter layer is
The n of certain doping concentration+Emitter junction, its square resistance are 40 ~ 300ohm/sq；Described battery sheet matrix serves as a contrast for p type single crystal silicon
Bottom, its resistivity are 1 ~ 30 Ω cm, and thickness is 50 ~ 300 μm, and the back side is burnishing surface or wet etching face, described combination diaphragm
For silica（SiOx）, aluminum oxide（AlOx）And silicon nitride (SiNx）The two membranes being combined into Deng film or trilamellar membrane system, it is described
The gross thickness for combining protection film layer is 60 ~ 500 μm.
5. MWT solar battery sheets according to claim 2, it is characterised in that：Front on described back side aluminium lamination connects
Touched electrode and rear-face contact electrode are in 4 × 4 array arrangements, make the front electrode contact point and backplate contact point overall
In the arrangement of the column array of 4 rows × 8.
6. MWT solar battery sheets according to claim 2, it is characterised in that：Front face on described shady face
Electrode and rear-face contact electrode are in 8 × 8 array arrangements, make the front electrode contact point and backplate contact point be in integrally
The arrangement of the column array of 8 rows × 16.
7. MWT solar cell modules made of a kind of MWT solar battery sheets using described in any one of claim 1 ~ 6,
It is characterized in that：Including at least two pieces battery units being split to form by above-mentioned MWT solar battery sheets, the battery described in every piece
Unit has the row front electrode contact point being distributed in respectively by the opposite side edge of the battery unit shady face and a row back of the body
Face electrode contact point；Described battery unit arranged adjacent formation group string, each front electrode contact of adjacent battery unit
It is connected between point and each backplate contact point by welding；Positioned at the front electrode of the battery unit of described group of string one end
Be connected between contact point and busbar by welding, positioned at the described group of string other end battery unit backplate contact point with
It is connected between another busbar by welding.
8. MWT solar cell modules according to claim 7, it is characterised in that：On all battery units just
The quantity of face electrode contact point and backplate contact point is equal.
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| CN107195696A (en) * | 2017-05-10 | 2017-09-22 | 晶澳（扬州）太阳能科技有限公司 | A kind of MWT solar battery sheets and the MWT solar cell modules being made using it |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107195696A (en) * | 2017-05-10 | 2017-09-22 | 晶澳（扬州）太阳能科技有限公司 | A kind of MWT solar battery sheets and the MWT solar cell modules being made using it |
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