CN109196659A

CN109196659A - Solar battery sheet and preparation method thereof, solar battery string and photovoltaic module

Info

Publication number: CN109196659A
Application number: CN201880001539.5A
Authority: CN
Inventors: 郁操; 杨苗; 徐希翔
Original assignee: Beijing Juntai Innovation Technology Co Ltd
Current assignee: Deyun Chuangxin Beijing Technology Co ltd
Priority date: 2017-12-05
Filing date: 2018-08-21
Publication date: 2019-01-11

Abstract

A kind of solar battery sheet, first electrode, the first transparency conducting layer, the first doped layer of the first conductive type, the first passivation layer, monocrystalline silicon piece, the second passivation layer, the second doped layer of the second conductive type, the second transparency conducting layer and the second electrode successively arranged including conducting connecting part and from top to bottom.One end of conducting connecting part is electrically connected with first electrode, and the other end of conducting connecting part extends to the second transparency conducting layer adjacent to the side of second electrode, the conducting connecting part respectively with second transparency conducting layer and the second electrode mutually insulated.

Description

Solar battery sheet and preparation method thereof, solar battery string and photovoltaic module

This application claims in submission on December 5th, 2017 Patent Office of the People's Republic of China, application No. is 201711268793.5, invention names Referred to as " solar battery sheet and preparation method thereof, solar battery string and photovoltaic module " and on December 5th, 2017 are submitted Patent Office of the People's Republic of China, application No. is 201721672980.5, entitled " generating electricity on two sides solar battery sheet, battery strings and double The priority of the Chinese patent application of face power generation photovoltaic module ", entire contents are hereby incorporated by reference in the application.

Technical field

This disclosure relates to technical field of solar more particularly to a kind of solar battery sheet and preparation method thereof, solar energy Battery strings and photovoltaic module.

Background technique

With the development of solar battery technology, heterojunction solar battery is become with the characteristics of its efficient and high stability One of mainstream solar battery.According to different mounting means and installation environment, the practical outdoor hair of heterojunction solar battery The practical outdoor generating amount of electricity ratio conventional crystalline silicon battery is higher by 15%-30%.Evaluate heterojunction solar battery performance superiority and inferiority An important indicator be short-circuit current density Jsc.Short-circuit current density Jsc is bigger, and heterojunction solar battery efficiency is higher.

Summary of the invention

Disclosure first aspect provides a kind of solar battery sheet, and the solar battery sheet includes: conducting connecting part The first electrode successively arranged from top to bottom, the first transparency conducting layer, the first doped layer of the first conductive type, the first passivation Layer, monocrystalline silicon piece, the second passivation layer, the second doped layer of the second conductive type, the second transparency conducting layer and second electrode, it is described to lead One end of electrical connector is electrically connected with the first electrode, and the other end of the conducting connecting part extends to described second and transparent leads Electric layer adjacent to the side of the second electrode, the conducting connecting part respectively with second transparency conducting layer and second electricity Pole mutually insulated.

In some embodiments, first doped layer and second doped layer form pn-junction and close.

In some embodiments, the first electrode includes a plurality of first grid line, and a plurality of first grid line meets at one It rises, the intersection of a plurality of first grid line forms the first confluence, and the conducting connecting part is electrically connected with first confluence It connects.

In some embodiments, the width of every first grid line in a plurality of first grid line is 30 μm -90 μm.

In some embodiments, the second electrode includes a plurality of second grid line, and a plurality of second grid line meets at one It rises, the intersection of a plurality of second grid line forms the second confluence.

In some embodiments, the width of the second grid line of each of described a plurality of second grid line is 30 μm -90 μm.

In some embodiments, the quantity of first confluence and second confluence is multiple, the conduction The quantity of connector is multiple；The multiple conducting connecting part is connect with the multiple first confluence correspondingly.

In some embodiments, first through hole is offered on the monocrystalline silicon piece, and is offered on first passivation layer Two through-holes offer third through-hole on first doped layer, offer fourth hole on second passivation layer, and described second Fifth hole is offered on doped layer, and the 6th through-hole, second transparency conducting layer are offered on first transparency conducting layer On offer the 7th through-hole, the first through hole, second through-hole, the third through-hole, the fourth hole, the described 5th Through-hole, the 6th through-hole and the 7th through-hole constitute through hole, and the conducting connecting part setting is in the through hole.

In some embodiments, second transparency conducting layer is used to contact the surface of the conducting connecting part and described The inner wall of through hole and it is provided with insulating film, or

The insulated hole of cyclic structure is offered on second transparency conducting layer, the insulated hole is in the monocrystalline silicon piece The orthographic projection that plane where one of face is formed is cyclic annular orthographic projection, and the through hole is in plane where one of face Orthographic projection and the conducting connecting part in the orthographic projection of plane where one of face be respectively positioned on the cyclic annular orthographic projection In area defined, second confluence is located at the cyclic annular positive throwing in the orthographic projection of plane where one of face Outside shadow area defined.

In some embodiments, the quantity of the through hole is multiple, and the quantity of the conducting connecting part is multiple；It is more A conducting connecting part is located at correspondingly in multiple through holes；The multiple through hole is arranged according to n × n array, n be greater than Integer equal to 3.

In some embodiments, the conducting connecting part is connector made of silver paste is recorded and/or first doping Layer is the base and doped layer of N-type amorphous silicon, and second doped layer is the base and doped layer of P-type non-crystalline silicon, and/or

First doped layer is the base and doped layer of P-type non-crystalline silicon, and second doped layer is the base and doped layer of N-type amorphous silicon, And/or

First passivation layer and second passivation layer are amorphous silicon base intrinsic passivation layer.

Disclosure second aspect additionally provides a kind of preparation method of solar battery sheet, the system of the solar battery sheet Preparation Method includes:

First through hole is opened up on monocrystalline silicon piece；The monocrystalline silicon piece includes opposite the first face and the second face；

Making herbs into wool operation and cleaning operation are carried out to first face and second face；

The first passivation layer and the first doped layer are sequentially formed in first face；It is blunt that second is sequentially formed in second face Change layer and the second doped layer；

The first transparency conducting layer is formed far from the surface of first passivation layer in first doped layer；Described second Doped layer forms the second transparency conducting layer far from the surface of the second passivation stacking；

First electrode is prepared far from the surface of first doped layer in first transparency conducting layer；Thoroughly described second Bright conductive layer prepares second electrode far from the surface of second doped layer；In the preparation first electrode or the preparation the Preparation is located at the conducting connecting part in the first through hole when two electrodes, so that one end of the conducting connecting part and described first Electrode connection, the other end of the conducting connecting part and extends to second transparency conducting layer adjacent to the one of the second electrode Side.

In some embodiments, it is described first face sequentially form the first passivation layer and the first doped layer include: First face is sequentially depositing the first passivation layer and the first doped layer, so that first passivation layer includes the second through-hole, it is described First doped layer includes third through-hole, and the first through hole, second through-hole and the third through-hole are in the first face institute It is overlapped in the orthographic projection of plane；

It is described to sequentially form the second passivation layer in second face and the second doped layer includes: successively to sink in second face Product the second passivation layer and the second doped layer, so that second passivation layer includes fourth hole, second doped layer includes the Five through-holes, the orthographic projection weight of the first through hole, the fourth hole and the fifth hole in plane where second face It is folded；

It is described first doped layer far from first passivation layer surface formed the first transparency conducting layer include: First doped layer deposits the first transparency conducting layer far from the surface of first passivation layer, so that first electrically conducting transparent Orthographic projection of the layer comprising the 6th through-hole, the first through hole and the 6th through-hole in plane where first face is overlapped；

It is described to include: in surface formation second transparency conducting layer of second doped layer far from the second passivation stacking The second transparency conducting layer is deposited far from the surface of second passivation layer in second doped layer, so that described second transparent leads Electric layer includes that the 7th through-hole, the first through hole and the 7th through-hole are overlapped in the orthographic projection of plane where second face；

It is the first through hole, second through-hole, the third through-hole, the fourth hole, the fifth hole, described 6th through-hole and the 7th through-hole form through hole；

It is described first transparency conducting layer far from first doped layer surface prepare first electrode and it is described Second transparency conducting layer is gradually carried out far from the surface preparation second electrode of second doped layer.

The preparation when preparing the first electrode or when preparing the second electrode is located in the first through hole Conducting connecting part includes:

Preparation is located at the conducting connecting part in through hole when preparing the first electrode or when preparing the second electrode；

In some embodiments, after forming the second transparency conducting layer, the first electrode and described second are being prepared Before electrode, the preparation method of the solar battery sheet further include:

The inner wall of the through hole is formed by by the first transparency conducting layer using etching process or laser etching process It is removed with the second transparency conducting layer；Or,

It is exhausted in the surface preparation that the inner wall of the through hole and second transparency conducting layer are used to contact conducting connecting part Velum, and/or

It is described before preparing the first electrode and the second electrode after forming the second transparency conducting layer The preparation method of solar battery sheet further include:

The insulated hole that cyclic structure is opened up on second transparency conducting layer puts down the insulated hole where the second face The orthographic projection that face is formed is cyclic annular orthographic projection, and the 7th through-hole included by the through hole is formed in plane where second face Orthographic projection be located in the cyclic annular orthographic projection area defined, the 7th through-hole is described second included by the through hole The orthographic projection of plane where face and the conducting connecting part are respectively positioned on the ring-type in the orthographic projection of plane where second face In orthographic projection area defined.

In some embodiments, the quantity of the through hole and the insulated hole is multiple；Multiple through holes are described The orthographic projection that plane where second face is formed is located at the multiple insulated hole in planar shaped where second face correspondingly At cyclic annular orthographic projection area defined in.

In some embodiments, it is described opened up on monocrystalline silicon piece first through hole include: by the way of laser boring Multiple first through hole are formed on monocrystalline silicon piece；And/or

It is described to include: in surface preparation first electrode of first transparency conducting layer far from first doped layer

It is a plurality of in surface printing of first transparency conducting layer far from first doped layer using silk-screen printing technique First grid line forms the first electrode, and a plurality of first grid line crosses to form multiple first confluences, and the multiple first Confluence the orthographic projection of plane where first face be located at correspondingly the through hole where first face put down In the orthographic projection in face；And/or

It is described to include: in surface preparation second electrode of second transparency conducting layer far from second doped layer

It is a plurality of in surface printing of second transparency conducting layer far from second doped layer using silk-screen printing technique Second grid line forms the second electrode, and a plurality of second grid line crosses to form multiple second confluences, and the multiple second Confluence is located at the multiple insulated hole in the second face institute in the orthographic projection of plane where second face correspondingly It is formed by outside cyclic annular orthographic projection area defined in plane；And/or

Step 503: in the printing a plurality of first grid line or the printing a plurality of second grid line, to institute It states in multiple through holes and records silver paste；

Step 504: the silver paste recorded in the multiple through hole being dried, so that being recorded in the multiple through hole Silver paste solidification, obtain multiple conducting connecting parts so that the multiple conducting connecting part be located at correspondingly it is described more In a through hole.

The third aspect of the disclosure also provides a kind of solar battery string, comprising: multiple solar battery sheets, In, multiple solar battery sheets are electrically connected.

In some embodiments, the multiple solar battery sheet serial or parallel connection is together；Or

The multiple solar battery sheet to link together constitutes at least two battery substrings being connected in parallel, each Battery substring includes multiple solar battery sheets being cascaded.

In some embodiments, the solar battery string further includes the interconnecting strip for multiple battery strings in parallel；It is described Included by a solar battery sheet in multiple battery substrings in each battery substring in two neighboring solar battery sheet Conducting connecting part is electrically connected with second electrode included by another solar battery sheet by conductive connecting.

In some embodiments, the conductive connecting is tin-coated copper strip.

Disclosure fourth aspect also provides a kind of photovoltaic module, and the photovoltaic module successively includes foreboard, the from top to bottom One adhesive layer, solar battery string, the second adhesive layer and backboard；The solar battery string is the solar battery string.

Detailed description of the invention

Fig. 1 is the structural schematic diagram for the solar battery sheet that some embodiments of the disclosure provide.

Fig. 2 is the section structure diagram for the first solar battery sheet that some embodiments of the disclosure provide.

Fig. 3 is the section structure diagram for second of solar battery sheet that some embodiments of the disclosure provide.

Fig. 4 is the section structure diagram for the third solar battery sheet that some embodiments of the disclosure provide.

The through-hole structure schematic diagram that the solar battery sheet that Fig. 5 is provided by some embodiments of the disclosure opens up.

Fig. 6 is the structural schematic diagram for the solar battery string that some embodiments of the disclosure provide.

Fig. 7 is the structural schematic diagram for the solar battery string that some embodiments of the disclosure provide.

Fig. 8 is the structural schematic diagram for the photovoltaic module that some embodiments of the disclosure provide.

Fig. 9 is the preparation method flow chart one for the solar battery sheet that some embodiments of the disclosure provide.

Figure 10 is the preparation method flow chart two for the solar battery sheet that some embodiments of the disclosure provide.

Figure 11 is the preparation method flow chart three for the solar battery sheet that some embodiments of the disclosure provide.

Figure 12 is the preparation method flow chart of step 5 in Fig. 9-Figure 11.

Specific embodiment

Embodiment of the disclosure is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, and is only used for explaining the disclosure, and cannot be construed to the limitation to the disclosure.

In the related art, since heterojunction solar battery has the characteristic of generating electricity on two sides.Therefore, heterojunction solar The two sides of battery all has electrode.Electrode possessed by two opposite surfaces of heterojunction solar battery includes between more Every the thin grid line and main gate line of distribution.Since main gate line blocks the part light area of heterojunction solar battery piece, cause different The short-circuit current density of matter joint solar cell piece reduces；Correspondingly, the photoelectric conversion efficiency of heterojunction solar battery also phase The reduction answered.Since main gate line is made of silver-colored material.Therefore, when a large amount of using silver-colored material production main gate line, main grid is made The cost of line is very high.

In addition, existing solar battery sheet is using metal piercing winding (Metal Wrap Through, be abbreviated as MWT) back Contact technique and the special backboard for being integrated with positive and negative electrode match, mutual between two neighboring solar battery sheet to realize Connection.But since the special backboard for being integrated with positive and negative electrode is nontransparent, when the backboard of solar battery sheet is to be integrated with The special backboard of positive and negative electrode, solar battery sheet cannot achieve generating electricity on two sides function.Moreover, because being integrated with positive and negative electrode Special backboard it is generally expensive, be unfavorable for the control of industrialization cost.

As shown in Figure 1, in view of the above-mentioned problems, the disclosure some embodiments provide a kind of solar battery sheets.Opposite phase The light-receiving surface area of heterojunction solar battery disclosed in the technology of pass, the solar battery sheet is relatively high, so that solar energy The short-circuit current density of battery is high with respect to the short-circuit current density of heterojunction solar battery disclosed in the relevant technologies.Due to too The short-circuit current density of positive energy cell piece is high with respect to the short-circuit current density of heterojunction solar battery disclosed in the relevant technologies, Therefore, the photoelectric conversion efficiency of solar battery sheet turns relative to the photoelectricity of heterojunction solar battery disclosed in the relevant technologies It changes high-efficient.

In conjunction with Fig. 1-Fig. 4, the solar battery sheet 100 that some embodiments of the disclosure provide includes 102 He of conducting connecting part The first electrode 10 once arranged from top to bottom, the first transparency conducting layer 20, the first doped layer 30, first of the first conductive type are blunt Change layer 40, monocrystalline silicon piece 50, the second passivation layer 60, the second doped layer 70 of the second conductive type, the second transparency conducting layer 80, second Electrode 90.One end of conducting connecting part 102 is electrically connected with first electrode 10, and the other end of conducting connecting part 102 extends to second Transparency conducting layer 80 is adjacent to the side of second electrode 90.

It is understood that as Figure 1-Figure 4, when the other end of above-mentioned conducting connecting part 102 extends to described second When transparency conducting layer 80 is adjacent to the side of second electrode 90, above-mentioned conducting connecting part 102 and the second transparency conducting layer 80 are mutually absolutely Edge, above-mentioned conducting connecting part 102 and 90 mutually insulated of second electrode.In some embodiments, when above-mentioned conducting connecting part 102 When the other end extends to second transparency conducting layer 80 adjacent to the side of second electrode 90, above-mentioned conducting connecting part 102 it is another One end and second electrode 90 are respectively positioned on surface of above-mentioned second transparency conducting layer 80 far from the second doped layer 70.From the angle of electrical connection For degree, since one end of conducting connecting part 102 is electrically connected with above-mentioned first electrode 10, above-mentioned conducting connecting part 102 it is another End extends to second transparency conducting layer 80 adjacent to the side of second electrode 90, and therefore, the electric current of the first electrode 10 is drawn End is located at second transparency conducting layer 80 adjacent to the side of second electrode 90.Since the electric current exit of first electrode 10 is located at Second transparency conducting layer 80 is adjacent to the side of second electrode 90, therefore, the electric current exit of first electrode 10 and the second electricity The electric current exit of pole 90 is in same plane.Since the electric current exit of first electrode 10 and the electric current of second electrode 90 are drawn End is in same plane, therefore, by conductive connection included by a solar battery sheet in two solar battery sheets 100 Part is connect with second electrode included by another solar battery sheet in two solar batteries, it can be achieved that two solar-electricities The series connection of pond piece 100.Moreover, because conducting connecting part included by solar battery sheet 100 does not occupy 10 institute of first electrode On face (i.e. surface of the first transparency conducting layer 20 far from the first doped layer 30), therefore, some embodiments of the disclosure are provided too Positive energy cell piece 100 reduces conducting connecting part 102 (being equivalent to main gate line in the related technology) to solar battery sheet 100 The shielding rate of light-receiving surface, so that the light-receiving area of solar battery sheet 100 increases.Due to the light of solar battery sheet 100 Area increases, and therefore, the photoelectric conversion efficiency of solar battery sheet 100 is promoted.

In addition, the solar battery sheet 100 that the embodiment of the present disclosure provides is without using being integrated with the special back of positive and negative electrode Plate, therefore, the solar battery sheet 100 that the embodiment of the present disclosure provides can realize that double-sided solar generates electricity.

In some embodiments, above-mentioned conducting connecting part 102 can be used metal and be made.

In some embodiments, as shown in Figure 1-Figure 3, above-mentioned conducting connecting part 102 is connector made of silver paste is recorded. At this point, replacing fine silver material to make conducting connecting part using the connector that silver paste records production, solar battery sheet can be reduced 100 cost of manufacture, and the production method for simplifying solar battery sheet 100.

In some embodiments, as shown in Fig. 1-Fig. 3 and Fig. 6, above-mentioned first electrode 10 includes a plurality of first grid line b1.It should A plurality of first grid line b1 crosses together, so that the intersection of a plurality of first grid line b1 forms the first confluence 11.Above-mentioned conduction One end of connector 102 is electrically connected with the first confluence 11.Such as: one end and the first confluence of above-mentioned conducting connecting part 102 11 realize electrical connection by the way of contact.

The width of every first grid line is usually set to 30 μm -90 μm in a plurality of first grid line b1.Such as: a plurality of first grid The width of every first grid line is 30 μm, 90 μm, 45 μm or 70 μm in line b1.Every first grid in a plurality of first grid line b1 The width direction of line is vertical with the linear direction of corresponding first grid line in a plurality of first grid line b1.

In some embodiments, as shown in fig. 6, above-mentioned second electrode 90 includes a plurality of second grid line b2.Described a plurality of Two grid line b2 cross together, so that the intersection of a plurality of second grid line b2 forms the second confluence 91.A plurality of first grid line The width of every second grid line is usually set to 30 μm -90 μm in b2.The width of every second grid line in a plurality of first grid line b2 It is set as 30 μm, 90 μm, 45 μm or 70 μm.The width direction of every second grid line in above-mentioned a plurality of second grid line b2 is more with this The linear direction of corresponding second grid line is vertical in the second grid line of item b2.

In some embodiments, as shown in Fig. 1-Fig. 4 and Fig. 6, although the other end of above-mentioned conducting connecting part 102 extends to Second transparency conducting layer 80 is adjacent to the side of above-mentioned second electrode 90, but since above-mentioned second electrode 90 includes a plurality of the Two grid line b2, so that formed second electrode 90 is the second electrode 90 of fenestral fabric.I.e. second electrode 90 has hollow-out parts. Based on this, need to guarantee that the other end of above-mentioned conducting connecting part 102 extends to second transparency conducting layer 80 adjacent to above-mentioned When the side of two electrodes 90, the other end of the conducting connecting part 102 extends to second transparency conducting layer 80 adjacent to above-mentioned The side of the hollow-out parts of two electrodes 90 can thus be avoided that the conducting connecting part 102 being electrically connected with the first confluence 11 and The electrical connection of two confluences 91.Since the conducting connecting part 102 being electrically connected with the first confluence 11 is electric not with the second confluence 91 Connection, therefore, in above-mentioned solar battery sheet 100, first electrode 10 and second electrode 90 will not be electrically connected, and thus will not So that short circuit occurs for solar battery sheet 100.

In some embodiments, as shown in fig. 6, above-mentioned first confluence 11 and the second confluence 91 are multiple.Correspondingly, The quantity of above-mentioned conducting connecting part 102 is multiple.When the first confluence 11 and the second confluence 91 are multiple, conducting connecting part When 102 quantity is multiple, the quantity of the quantity of conducting connecting part 102 and the first confluence 11 is corresponded.In other words, more First confluence 11 of each of a first confluence 11 corresponds to a conducting connecting part 102, in order to which multiple first converge Each first confluence is led to the second transparency conducting layer 80 adjacent to the surface of second electrode 90 in point 11, so that first electrode 10 electric current exit and the electric current exit of second electrode 90 are located at the same face of solar battery sheet 100.

In some embodiments, as Figure 1-Figure 5, first through hole a1 is offered on above-mentioned monocrystalline silicon piece 50.Above-mentioned The second through-hole a2 is offered on one passivation layer 40.Third through-hole a3 is offered on above-mentioned first doped layer 30.Above-mentioned second passivation Fourth hole a4 is offered on layer 60.Fifth hole a5 is offered on above-mentioned second doped layer 70.Above-mentioned first transparency conducting layer The 6th through-hole a6 is offered on 20, above-mentioned second transparency conducting layer 80 offers the 7th through-hole a7.It is the first through hole a1, described Second through-hole a2, the third through-hole a3, the fourth hole a4, the fifth hole a5, the 6th through-hole a6 and described 7th through-hole a7 is connected to constitute through hole 101.Through hole 101 is offered on i.e. above-mentioned solar battery sheet 100, so that institute Conducting connecting part 102 is stated to be arranged in the through-hole 101.

When above-mentioned conducting connecting part 102 is arranged in the through-hole 101, conducting connecting part 102 is in above-mentioned monocrystalline silicon piece 50 One of surface orthographic projection and above-mentioned first confluence 11 one of surface of above-mentioned monocrystalline silicon piece 50 positive throwing Shadow is at least overlapping.It is mixed at this point, the first confluence 11 is located at the 6th through-hole a6 that the first transparency conducting layer 20 is opened up far from first The end of diamicton 30.Meanwhile above-mentioned conducting connecting part 102 one of surface of above-mentioned monocrystalline silicon piece 50 orthographic projection with it is upper It is mutually indepedent to state orthographic projection of second confluence 91 on one of surface of above-mentioned monocrystalline silicon piece 50, even to avoid above-mentioned conduction Fitting 102 is electrically connected with the second confluence 91.

In some embodiments, as Figure 1-Figure 5, when above-mentioned first confluence 11 and the second confluence 91 be it is multiple, When the quantity of above-mentioned conducting connecting part 102 is multiple, the quantity of above-mentioned through hole 101 is multiple.Above-mentioned multiple conducting connecting parts It is located in multiple through holes 101 correspondingly.

As shown in figures 1 to 6, above-mentioned multiple through holes 101 are arranged according to n × n array.N is whole more than or equal to 3 Number.Such as: as n=3-8, n × n array be 3 × 3 arrays, 4 × 4 arrays ..., 8 × 8 arrays etc..

In some embodiments, as shown in Figure 1-Figure 3, above-mentioned first transparency conducting layer 20 and the second transparency conducting layer 80 are equal For TCO glass conductive layer.

In some embodiments, as shown in Figure 1-Figure 3, above-mentioned first doped layer 30 is made using the following two kinds implementation It is combined with above-mentioned second doped layer 70pn, so that above-mentioned solar battery sheet is the solar battery sheet of PIN structural.

The first implementation: above-mentioned first doped layer 30 is the base and doped layer of N-type amorphous silicon, and the second doped layer 70 is p-type The base and doped layer of amorphous silicon.

Second of implementation, as shown in Figure 1-Figure 3, above-mentioned first doped layer 30 be the base and doped layer of P-type non-crystalline silicon, second Doped layer 70 is the base and doped layer of N-type amorphous silicon.

In some embodiments, as shown in Figure 1-Figure 3, above-mentioned first passivation layer 40 and above-mentioned second passivation layer 60 are non- Crystal silicon base intrinsic passivation layer.

In some embodiments, when above-mentioned first transparency conducting layer 20 and the second transparency conducting layer 80 are conductive layer, on It states and offers the 6th through-hole a6 on the first transparency conducting layer 20, offer the 7th through-hole a7 on above-mentioned second transparency conducting layer 80 When, a part of conducting connecting part 102 is located at the 6th through-hole a6 and the 7th through-hole a7.At this point, conducting connecting part 102 is possible to lead Cause the photoelectric conversion efficiency of influence solar battery sheet 100.For this problem, the inner wall of above-mentioned through-hole 101 is provided with insulating film c.The material of insulating film c is that (ethylene-vinyl acetate copolymer, is abbreviated as ethylene-vinyl acetate copolymer EVA), polyvinyl butyral (polyvinyl butyral, be abbreviated as PVB) or DNP (Dai Nippon Printing, contracting It is written as DNP) material.

In some embodiments, Fig. 3 and Fig. 4 are please referred to, when the side for arriving second electrode 90 along the second transparency conducting layer 80 To if conducting connecting part 102 stretches out the second transparency conducting layer 80, and its part and second for stretching out the second transparency conducting layer 80 Transparency conducting layer 80 is contacted adjacent to the surface of second electrode 90, then will make the first electrode connecting with conducting connecting part 102 10 are electrically connected with the second transparency conducting layer 80.Due to the first electrode 10 being connect with conducting connecting part 102 and the second electrically conducting transparent Layer 80 is electrically connected, and will lead to first electrode 10 and second electrode 90 links together, so that short circuit occurs in solar battery sheet 100 Problem.For another angle, since above-mentioned first transparency conducting layer 20 and above-mentioned second transparency conducting layer 80 are tools The conductive layer having conductivity.To avoid the first transparency conducting layer 20 and above-mentioned second transparency conducting layer 80 from influencing first electrode 10 With 90 collected current of second electrode, need to contact conducting connecting part in the first transparency conducting layer 20 and the second transparency conducting layer 80 Position carries out insulation processing.Due to the polarity and conducting connecting part 102 of the first electrode 10 being connect with the first transparency conducting layer 20 Identical, therefore, the first transparency conducting layer 20 contacted with first electrode 10 can not do insulation processing.And with the second electrically conducting transparent The polarity of second electrode 90 and the polarity of conducting connecting part 102 of 80 connection of layer on the contrary, therefore, contacted with second electrode 90 the Two transparency conducting layers 80 need to do insulation processing.

In one implementation, as shown in figure 4, above-mentioned insulating film c also covers the contact of the second transparency conducting layer 80 The surface that the surface of the conducting connecting part 102, i.e. the second transparency conducting layer 80 are used to contact the conducting connecting part 102 is also set Set insulating film c.Insulating film c can insulate conducting connecting part 102 and the second transparency conducting layer 80.

In another implementation, as shown in Figure 3 and Figure 5, cyclic structure is opened up on above-mentioned second transparency conducting layer 80 Insulated hole 801.The insulated hole 801 is ring in the orthographic projection that plane where one of face of above-mentioned monocrystalline silicon piece 50 is formed Shape orthographic projection.Above-mentioned through hole 101 exists in the orthographic projection of plane where one of face and with above-mentioned conducting connecting part 102 The orthographic projection of plane where one of face is located in the cyclic annular orthographic projection area defined.Due to through hole 101 It is located in the cyclic annular orthographic projection area defined in the orthographic projection of plane where one of face, therefore, above-mentioned the Outside the corresponding cyclic annular orthographic projection area defined cyclic annular orthographic projection corresponding with above-mentioned transparency conducting layer 80 of two transparency conducting layers 80 Region mutually insulated.Due to the corresponding cyclic annular orthographic projection area defined of above-mentioned second transparency conducting layer 80 and above-mentioned electrically conducting transparent Region mutually insulated outside the corresponding cyclic annular orthographic projection of layer 80, and the through hole 101 is in plane where one of face Orthographic projection and the conducting connecting part are respectively positioned on the cyclic annular orthographic projection institute in the orthographic projection of plane where one of face In the region surrounded, therefore, above-mentioned second transparency conducting layer 80 and 102 mutually insulated of conducting connecting part.

It crosses together in addition, working as a plurality of second grid line b2 included by above-mentioned second electrode 90, so that a plurality of second gate When the intersection of line b2 forms the second confluence 91, which should be with above-mentioned insulated hole 801 and above-mentioned through hole 101 are spatially staggered, to guarantee that the conducting connecting part 102 being located in the through hole 101 is in second confluence 91 State of insulation.In other words, second confluence 91 is located at the ring in the orthographic projection of plane where one of face Outside shape orthographic projection area defined.At this point, although above-mentioned conducting connecting part 102 is connected to the corresponding ring of above-mentioned transparency conducting layer 80 In shape orthographic projection area defined, but it can't be met at a plurality of second grid line b2 included by above-mentioned second electrode 90 It is formed by the electrical connection of the second confluence 91 together.Therefore, although the above-mentioned conducting connecting part 102 being electrically connected with first electrode blocks It connects in the corresponding cyclic annular orthographic projection area defined of above-mentioned transparency conducting layer 80, but can't make and conducting connecting part The first electrode 10 of 102 connections is electrically connected with the second electrode 90 for contacting above-mentioned second transparency conducting layer 80.

In some embodiments, Fig. 3-Fig. 5 is please referred to, after forming conducting connecting part 102 in above-mentioned through hole 100, such as Fruit arrives the direction of second electrode 90 along the second transparency conducting layer 80, and conducting connecting part 102 stretches out the second transparency conducting layer 80, and It is contacted with the second transparency conducting layer 80 adjacent to the surface of second electrode 90, then conducting connecting part 102 stretches out the second electrically conducting transparent The part of layer 80 is greater than the radical length of through hole 101 in the length of the radial direction of through hole 101.In order to ensure above-mentioned insulation Hole 801 can play insulating effect, and above-mentioned insulated hole 801 is away from conducting connecting part 102.Relatively in above-mentioned through-hole 101 The surface of wall and the second transparency conducting layer 80 contact conducting connecting part 102 forms the insulation mode of insulating film c, thoroughly above-mentioned second It is more simple and be more easier to operate that the insulation mode of insulated hole 801 is opened up on bright conductive layer 80.

In addition, it is led as shown in figure 3, although above-mentioned first doped layer 30 and the second doped layer 70 are also electrically conductive Electrical property almost can be ignored.Therefore, only insulated hole 801 need to be opened up on the second transparency conducting layer 80.

As Figure 1-Figure 5, the solar battery sheet 100 that some embodiments of the disclosure provide, by solar battery sheet 100 One side electrode (i.e. first electrode 10) using conducting connecting part 102 guidance to be located at solar battery sheet 100 other one Face (i.e. the second transparency conducting layer 80 is adjacent to the surface of second electrode 90).It is when needing that at least two solar battery sheets 100 are mutual When connection, the different electrode of two neighboring solar battery sheet 100 is interconnected using conductive connecting 210.Due to the first electricity Pole 10 and second electrode 90 are directed to the same face positioned at solar battery sheet 100, and therefore, conductive connecting 102 will not shadow Ring the light-receiving surface area in the 10 place face of first electrode of the solar battery sheet 100.Since conductive connecting 102 will not influence The light-receiving surface area of the another side of the solar battery, therefore, comparatively, the light-receiving surface area of solar battery sheet 100 It improves, so that its short-circuit current density is promoted.Due to the short-circuit current density of solar battery sheet 100, The photoelectric conversion efficiency of solar battery sheet 100 increases.

In some embodiments, as shown in figs 2-4, above-mentioned conducting connecting part 102 is to record connector made of silver paste. Compared to the mode for directlying adopt silver paste main gate line being made, a large amount of silver paste can be saved using the connector for recording silver paste production, Therefore, above-mentioned conducting connecting part 102 be record connector made of silver paste can be greatly reduced above-mentioned solar battery sheet 100 at This.

In further embodiments, it when making above-mentioned conducting connecting part 102, does not need using silver-colored material, it is only necessary to use copper Or the common metals material such as tin-coated copper, therefore, the manufacturing cost of above-mentioned conducting connecting part 102 is relatively low.

As shown in Fig. 1-Fig. 5 and Fig. 9-Figure 11, some embodiments of the disclosure additionally provide a kind of system of solar battery sheet Preparation Method, the preparation method of the solar battery sheet 100 include: step 1 (S1), step 2 (S2), step 3 (S3), step 4 (S4) and step 5 (S5).

In S1, first through hole a1 is opened up on monocrystalline silicon piece 50, which includes opposite 501 He of the first face Second face 502.The mode that first through hole a1 is opened up on monocrystalline silicon piece 50 is relatively more, such as: by the way of laser boring First through hole a1 is formed on monocrystalline silicon piece 50.

In S2, making herbs into wool operation and cleaning operation are carried out to first face 501 and second face 502.Making herbs into wool behaviour Work refers to: be respectively formed the flannelette of pyramid pattern in the first face 501 and second face 502, pyramidal size (it is maximum across Degree) it is 1 μm -10 μm.Making herbs into wool operates the reflectivity that can reduce by 50 surface of monocrystalline silicon piece, to increase made solar battery sheet 100 photoelectric conversion efficiency.

In S3, the first passivation layer 40 and the first doped layer 30 are sequentially formed in above-mentioned first face 501.In above-mentioned second face 502 sequentially form the second passivation layer 60 and the second doped layer 70.

In some embodiments, the first passivation layer 40 is sequentially formed in above-mentioned first face 501 and the first doped layer 30 includes: It is sequentially depositing the first passivation layer 40 and the first doped layer 30 in above-mentioned first face 501, so that first passivation layer 40 includes second Through-hole a2, first doped layer 30 include third through-hole a3.The first through hole a1, the second through-hole a2 and the third are logical Hole a3 is overlapped in the orthographic projection of the 501 place plane of the first face.

The second passivation layer 60 is sequentially formed in above-mentioned second face 502 and the second doped layer 70 includes: in above-mentioned second face 502 Be sequentially depositing the second passivation layer 60 and the second doped layer 70 so that second passivation layer 60 include fourth hole a4, described second Doped layer 70 includes fifth hole a5.The first through hole a1, the fourth hole a4 and the fifth hole a5 are described The orthographic projection of two faces, 502 place plane is overlapped.

In some embodiments, above-mentioned deposition method can be the vapour deposition process (Plasma of plasma enhanced chemical Enhanced Chemical Vapor Deposition, is abbreviated as PECVD) or hot filament CVD (Hot Wire ChemicalVapor Deposition, is abbreviated as HWCVD).The two are blunt for first passivation layer 40 and the second passivation layer 60 Change layer and the first doped layer 30 and second the two doped layers of doped layer 70 use identical depositional mode.Deposit the first passivation layer 40 and when the second passivation layer 60 formed in same step, deposit and complete in different chambers.

Illustratively, it is formed simultaneously the first passivation layer 40 and the second passivation layer 60 in the same chamber, then in another chamber Room forms the first doped layer 30 and the second doped layer 70.

In some embodiments, above-mentioned first doped layer 30 is the base and doped layer of N-type amorphous silicon.Above-mentioned second doped layer 70 is The base and doped layer of P-type non-crystalline silicon.

In further embodiments, above-mentioned first doped layer 30 is the base and doped layer of P-type non-crystalline silicon.Above-mentioned second doped layer 70 For the base and doped layer of N-type amorphous silicon.

In some embodiments, above-mentioned first passivation layer 40 and the second passivation layer 60 are amorphous silicon base intrinsic passivation layer.

In S4, the first transparency conducting layer is formed far from the surface of first passivation layer 40 in above-mentioned first doped layer 30 20.The second transparency conducting layer 80 is formed far from the surface of second passivation layer 60 in the second doped layer 70.

In some embodiments, first is formed thoroughly far from the surface of first passivation layer 40 in above-mentioned first doped layer 30 Bright conductive layer 20 includes: to deposit the first transparency conducting layer far from the surface of first passivation layer 40 in above-mentioned first doped layer 30 20, so that first transparency conducting layer 20 includes the 6th through-hole a6.The first through hole a1 and the 6th through-hole a6 are described The orthographic projection of first face, 501 place plane is overlapped.

Forming the second transparency conducting layer 80 far from the surface of second passivation layer 60 in above-mentioned second doped layer 70 includes: Above-mentioned second doped layer 70 far from second passivation layer 60 fold surface deposit the second transparency conducting layer 80 so that this second Transparency conducting layer 80 includes the 7th through-hole a7.The first through hole a1 and the 7th through-hole a7 is where second face 502 The orthographic projection of plane is overlapped.

Above-mentioned deposition method can (Physical Vapor Deposition, be abbreviated as physical vaporous deposition PVD), or remote plasma coating method.Remote plasma coating method is also known as reaction equation plasma coating (plasma Reactive Deposition, be abbreviated as PRD).

Above-mentioned first through hole a1, the second through-hole a2, third through-hole a3, fourth hole a4, fifth hole a5, the 6th are led to Hole a6 and the 7th through-hole a7 connection is to form through hole 101；

In some embodiments, above-mentioned first transparency conducting layer 20 and above-mentioned second transparency conducting layer 80 are TCO glass Conductive layer.

In S5: preparing first electrode 10 far from the surface of first doped layer 30 in above-mentioned first transparency conducting layer 20. Second electrode 90 is prepared far from the surface of second doped layer 70 in above-mentioned second transparency conducting layer 80.Also, it is somebody's turn to do in preparation First electrode 10 or when preparing the second electrode 90 preparation be located at the conducting connecting part 102 in the first through hole a1.

In some embodiments, described in surface system of first transparency conducting layer 20 far from first doped layer 30 Standby first electrode 10 and described in surface preparation second electricity of second transparency conducting layer 80 far from second doped layer 70 Pole 90 gradually carries out.

The preparation when preparing the first electrode 10 or when preparing the second electrode 90 is located at the first through hole Conducting connecting part 102 in a1 includes:

Preparation is located at the conduction in through hole 101 when preparing the first electrode 10 or when preparing the second electrode 90 Connector 101.

In some embodiments, when the quantity of above-mentioned through hole is multiple, above-mentioned S1 includes:

Multiple first through hole a1 are formed on monocrystalline silicon piece 50 by the way of laser boring.And/or

As shown in Fig. 1-Fig. 6 and Figure 12, on surface of above-mentioned first transparency conducting layer 20 far from first doped layer 30 Preparing first electrode 10 includes step 501 (S501).And/or

In S501, using silk-screen printing technique in table of above-mentioned first transparency conducting layer 20 far from first doped layer 30 A plurality of first grid line b1 is printed in face, forms the first electrode 10 of a plurality of first grid line b1 composition.The a plurality of first grid line b1 is handed over Remittance forms multiple first confluences 11.Multiple first confluence 11 is corresponded in the orthographic projection of 501 place plane of the first face Be located at above-mentioned through hole 101 in the orthographic projection of 501 place plane of the first face.And/or

As shown in Fig. 1-6 and Figure 12, in surface system of above-mentioned second transparency conducting layer 80 far from second doped layer 70 Standby second electrode 90 includes step 502 (S502).

In S502, a plurality of second grid line b2 is printed in the second transparency conducting layer 80 using silk-screen printing technique, is formed a plurality of The second electrode 90 of second grid line b2 composition.The a plurality of second grid line b2 crosses, and forms multiple second confluences 91.It is described more A second confluence 91 is located at the insulated hole 801 in institute in the orthographic projection of the 502 place plane of the second face correspondingly 502 place plane of the second face is stated to be formed by outside cyclic annular orthographic projection area defined.And/or

Above-mentioned preparation when preparing the first electrode 10 or when preparing the second electrode 90 is located in the first through hole a1 Conducting connecting part include: step 503 (S503) and step 504 (S504).

In S503, in a plurality of first grid line b1 of above-mentioned printing or a plurality of second grid line b2 of above-mentioned printing, to described more Silver paste is recorded in a through hole a5；

In S504, the silver paste recorded in the multiple through hole 101 is dried, so that the multiple through hole 101 The silver paste solidification inside recorded, obtains multiple conducting connecting parts 102, so that the multiple conducting connecting part 102 corresponds Be located at the multiple through hole 101 in.

Since above-mentioned multiple first confluences 11 are located at first through hole a1 in the orthographic projection of 501 place plane of the first face On one side in the orthographic projection of 501 place planes, and the multiple second confluence 91 is in the positive throwing of the 502 place plane of the second face Shadow is mutually indepedent in the orthographic projection of the 502 place plane of the second face with the first through hole a1.Therefore, when the multiple conduction When connector 102 is located in the multiple through hole 101 correspondingly, one end of above-mentioned multiple conducting connecting parts 102 can one One it is corresponding be electrically connected with the first confluence 11, the other ends of above-mentioned multiple conducting connecting parts 102 will not with above-mentioned multiple The electrical connection of two confluences 91.

From the above, it can be seen that: after multiple conducting connecting parts 102 are formed in the multiple through hole 100 correspondingly, on It states the electric current exit of first electrode 10 and leads to above-mentioned second transparency conducting layer 80 adjacent to the by multiple conducting connecting parts 102 The surface of two electrodes 90, so that the electric current exit of first electrode 10 and second electrode 90 are located at the same face.

In some embodiments, above-mentioned first electrode 10 and above-mentioned second electrode 90 are made using silver paste and resin material.

Illustratively, silver paste and resin material are mixed, forms the pre-composition for being 90% or more containing mass percent.It adopts With silk-screen printing technique in surface printing pre-composition of second transparency conducting layer 80 far from second doped layer 70, so that A plurality of second grid line b2 is formed in surface of second transparency conducting layer 80 far from second doped layer 70.Similarly, it uses Silk-screen printing technique is in surface printing pre-composition of first transparency conducting layer 20 far from first doped layer 30, so that more The second grid line of item b2 is formed in surface of first transparency conducting layer 20 far from first doped layer 30.

In some embodiments, as Figure 1-Figure 5, above-mentioned first passivation layer 40, above-mentioned first doped layer 30, above-mentioned One transparency conducting layer 20, above-mentioned second passivation layer 60, above-mentioned second doped layer 70 and above-mentioned second transparency conducting layer 80 thickness For nanoscale, and the diameter of through-hole 101 is grade, therefore, is depositing the first passivation layer 40, the first doped layer 30, first thoroughly When bright conductive layer 20, the second passivation layer 60, the second doped layer 70 and the second transparency conducting layer 80, above-mentioned first through hole a1 inner wall Upper end (end that first through hole a1 is located at above-mentioned first face, 501 direction) be possible to attachment the first passivation layer 40 material, The material of the material of first doped layer 30 and the first transparency conducting layer 20 is formed by the first sedimentary.First sedimentary is the The material of the material of one passivation layer 40, the material of the first doped layer 30 and the first transparency conducting layer 20 is formed by three-decker. The lower end (end that first through hole a1 is located at above-mentioned second face direction) of the inner wall of above-mentioned first through hole a1 is possible to adhere to The material of the material of second passivation layer 60, the material of the second doped layer 70 and the second transparency conducting layer 80 is formed by the second deposition Layer.Second sedimentary is material, the material of the second doped layer 70 and the material of the second transparency conducting layer 80 of the second passivation layer 60 Material is formed by three-decker.Due to the material of the first transparency conducting layer 20 and the materials conductive of the second transparency conducting layer 80, such as Fruit does not remove the material of the material of the first transparency conducting layer 20 and the second transparency conducting layer 80 accompanying by the inner wall of first through hole a1 Material, then the conducting connecting part 102 connected with first electrode 10 can be made to contact, second connect with second electrode 90 is transparent to be led Electric layer 80 causes the polarity of conducting connecting part 102 to be affected.Since the conducting connecting part 102 connecting with first electrode 10 connects The second transparency conducting layer 80 for connecting with second electrode 90 is touched, therefore, the first electrode 10 of above-mentioned solar battery sheet 100 and the Two electrodes 90 link together, so that 100 short circuit of above-mentioned solar battery sheet.For this reason, it may be necessary to which the inner wall to through hole 101 carries out Insulation processing.In addition, though the first doped layer 30 and the second doped layer 70 are also electrically conductive, but its electric conductivity almost can be with It ignores.Therefore, the only material of the material to the first transparency conducting layer 20 in through hole 101 and the second transparency conducting layer 70 It is handled.

In one embodiment, as illustrated in figs. 1-4 and 9, after step s4, before step S5, the above-mentioned sun The production method of energy cell piece 100 further includes step 401 (S401):

In S401: formed the inner wall of through hole 101 using etching process or laser etching process (such as: it is formed Mode is depositional mode) the first transparency conducting layer 20 material and the second transparency conducting layer 80 material removal.When using rotten The inner wall of etching technique removal through hole 101 is formed by the material of the first transparency conducting layer 20 and the material of the second transparency conducting layer 80 When material, the inner wall that alkali corrosion through hole 101 can be used is formed by the material of the first transparency conducting layer 20 and second and transparent leads The material of electric layer 80.Highly basic includes the inorganic bases such as sodium hydroxide or potassium hydroxide.

Due to above-mentioned first passivation layer 40, above-mentioned first doped layer 30, above-mentioned first transparency conducting layer 20, above-mentioned second blunt The overall thickness for changing layer 60, above-mentioned second doped layer 70 and above-mentioned second transparency conducting layer 80 is nanoscale.For ease of operation, may be used Disposably corrode above-mentioned first through hole a1, above-mentioned second through-hole a2, above-mentioned third through-hole a3, above-mentioned fourth hole a4, above-mentioned The inner wall for the through hole 101 that five through-hole a5, above-mentioned 6th through-hole a6 and above-mentioned 7th through-hole a7 are constituted is formed by first thoroughly The material of the material of bright conductive layer 20 and the second transparency conducting layer 80, so that the material and second of the first transparency conducting layer 20 of removal The method of the material of transparency conducting layer 80 is simple to operate, highly reliable.

Illustratively, above-mentioned first doped layer with a thickness of 6nm, above-mentioned second doped layer with a thickness of 8nm, above-mentioned first The thickness of transparency conducting layer 20 and above-mentioned second transparency conducting layer 80 is 80nm.

In some embodiments, as shown in Fig. 2, Fig. 4, Fig. 5 and Fig. 9, after step s4, before step S5, it is above-mentioned too The preparation method of positive energy cell piece 100 further includes step 402 (S402).

In S402, it is conductively connected in the inner wall of above-mentioned through hole 101 and second transparency conducting layer 80 for contacting The surface of part 102 prepares insulating film c.Insulating film c is ethylene-vinyl acetate copolymer (ethylene-vinyl acetate Copolymer is abbreviated as EVA) material layer, polyvinyl butyral (polyvinyl butyral) material layer or DNP (Dai Nippon Printing, is abbreviated as DNP) plastic layer.Due to the material of above-mentioned first transparency conducting layer 20 and above-mentioned second transparent The material of conductive layer 80 is conductive material, to avoid the inner wall of above-mentioned through hole 101 from being formed by the first transparency conducting layer 20 The Effect of Materials electrode collected current of material and the second transparency conducting layer 80, it is especially desirable to included by the through hole 101 Insulating film is arranged in the inner wall of 7th through-hole a7 included by the inner wall of six through-hole a6 and the through hole 101.And due to above-mentioned first Passivation layer 40, above-mentioned first doped layer 30, above-mentioned first transparency conducting layer 20, above-mentioned second passivation layer 60, above-mentioned second doping The overall thickness of layer 70 and above-mentioned second transparency conducting layer 80 is therefore nanoscale is all set on the inner wall of above-mentioned through hole 101 Insulating film c is set, is formed by position without limiting insulating film c, so that insulating film c compares in the inner wall formation of through hole 101 It is convenient.Moreover, the inner wall in through hole 101 is all arranged insulating film c and can also guarantee above-mentioned conducting connecting part 102 and above-mentioned the One transparency conducting layer 20 and above-mentioned second transparency conducting layer 80 have good insulating properties.

Referring to FIG. 3, conducting connecting part 102 is stretched if arriving the direction of second electrode 90 along the second transparency conducting layer 80 Second transparency conducting layer 80 out, and its part and the lower surface of the second transparency conducting layer 80 for stretching out the second transparency conducting layer 80 (surface of neighbouring second electrode 90) face contact, then the first electrode 10 and second connecting with conducting connecting part 102 will be made Transparency conducting layer 80 is electrically connected.To avoid 80 electricity of the first electrode 10 connecting with conducting connecting part 102 and the second transparency conducting layer Connection, above-mentioned insulating film c are also formed in the second transparency conducting layer for contacting the surface of conducting connecting part, to utilize the insulating film C insulate conducting connecting part 102 and the second transparency conducting layer 80, to avoid the first electrode connecting with conducting connecting part 102 The second electrode 90 that 10 electrical connections are contacted with the second electrically conducting transparent part 80.

In further embodiments, as shown in Fig. 3, Fig. 5 and Figure 10, insulation processing can be carried out before S5 after S4. At this point, after S4, before step S5, the preparation method of above-mentioned solar battery sheet 100 further include: step 403 (S403).

In S403: the insulated hole 801 of cyclic structure is opened up on above-mentioned second transparency conducting layer 80, so that the insulated hole 801 in the orthographic projection that 502 place plane of the second face is formed be cyclic annular orthographic projection.7th through-hole included by above-mentioned through hole 101 A7 is located in the ring-type orthographic projection area defined in the orthographic projection that the 502 place plane of the second face is formed.The perforation 7th through-hole a7 included by hole 101 is in the orthographic projection of the 502 place plane of the second face and the conducting connecting part 102 in institute The orthographic projection for stating 502 place plane of the second face is respectively positioned in the cyclic annular orthographic projection area defined, second confluence 91 are located at outside the cyclic annular orthographic projection area defined in the orthographic projection of the 502 place plane of the second face.At this point, above-mentioned Two transparency conducting layers 80 correspond to the cyclic annular orthographic projection area defined not only ring corresponding with the second transparency conducting layer 80 The perimeter of shape orthographic projection is insulated, but also is insulated with second electrode 81.Due to the corresponding ring of the second transparency conducting layer 80 Shape orthographic projection area defined is electrically connected with above-mentioned conducting connecting part 102, therefore, is opened up on the second transparency conducting layer 102 Insulated hole 801 may make conducting connecting part 102 to insulate respectively with the second transparency conducting layer 80 and second electrode 90.

It is above-mentioned more simple in such a way that insulated hole 801 insulate the second transparency conducting layer 80 and conducting connecting part 102, It is more easier to operate.Above-mentioned first transparency conducting layer 20 is contacted with first electrode 10, and conducting connecting part 102 is electrically connected with first electrode It connects, therefore, the polarity of above-mentioned first transparency conducting layer 20 is identical as conducting connecting part 102, only need to be in the second transparency conducting layer 80 On open up insulated hole 801 i.e. and may make conducting connecting part 102 and insulate respectively with the second transparency conducting layer 80 and second electrode.

Fig. 6 shows the first battery strings, wherein omitting the part of interconnecting strip multiple first battery strings in parallel, art technology Personnel can understand according to conventional technical means.

As shown in fig. 6, the embodiment of the present disclosure additionally provides a kind of solar battery string 200.The solar battery string 200 packet Include multiple solar battery sheets 100 being electrically connected.

Compared with prior art, the beneficial effect and above-mentioned implementation for the solar battery string 200 that the embodiment of the present disclosure provides The beneficial effect for the solar battery sheet 100 that example provides is identical, and this will not be repeated here.

It will be apparent to a skilled person that as shown in Figure 6 and Figure 7, above-mentioned multiple solar battery sheets 100 are electrically connected When being connected together, electric connection mode can be series system or parallel way.When electric connection mode is series system, utilize Conductive connecting 210 connects the first electrode 10 of one of solar battery sheet 100 in two neighboring solar battery sheet 100 With the second electrode 90 of another solar battery sheet 100.When electric connection mode is series system, conductive connecting is utilized The first electrode 10 of one of solar battery sheet 100 in the 210 two neighboring solar battery sheets 100 of connection, and another The first electrode 10 of solar battery sheet 100.

In some embodiments, as shown in fig. 7, multiple solar battery sheets 100 to link together are constituted at least Two battery substring 200a being connected in parallel.Multiple battery substring 200a form solar battery by the way that interconnecting strip 400 is in parallel String 200.

As shown in fig. 6, in multiple battery substring 200a in each battery substring 200a, two neighboring solar battery sheet Second electricity included by conducting connecting part 102 included by a solar battery sheet in 100 and another solar battery sheet Pole 90 is electrically connected by conductive connecting 210, so that two neighboring solar battery sheet 100 is cascaded.

As shown in fig. 7, when parallel connection forms solar battery string 200, wherein an interconnecting strip 400 is by two neighboring battery Conducting connecting part 102 included by bottommost solar battery sheet included by substring 200a links together, so that multiple electricity The first electrode 10 of pond string is electrically connected, and another interconnecting strip 400 is by bottommost included by two neighboring battery substring 200a Second electrode 90 included by solar battery sheet is electrically connected, so that the second electrode 90 of multiple battery substrings is electrically connected It connects, obtains solar battery string 200.

In some embodiments, as shown in figs 1 to 6, when above-mentioned two neighboring solar battery sheet 100 is connected, the phase First electrode 10 and another solar battery included by a solar battery sheet in adjacent two solar battery sheets 100 The electrical connection of second electrode 90 included by piece.

Illustratively, as shown in figs 1 to 6, it is connected in two neighboring solar battery sheet 100 using conductive connecting 210 A solar battery sheet included by second electrode 90 included by first electrode 10 and another solar battery sheet.This When, it needs to connect using conductive connecting 210 included by a solar battery sheet in two neighboring solar battery sheet 100 The first confluence 11 and another solar battery sheet included by the second confluence 91.Due to each solar battery sheet First confluence 11 is electrically connected with above-mentioned conducting connecting part 102 in 100, and the other end of above-mentioned conducting connecting part 102 extends to Therefore surface of two transparency conducting layers 80 far from the second doped layer 70 connects two neighboring solar energy using conductive connecting 210 Included by first confluence 11 and another solar battery sheet included by a solar battery sheet in cell piece 100 When the second confluence 91, a solar battery in two neighboring solar battery sheet 100 is connected using conductive connecting 210 Second confluence 91 included by conducting connecting part 102 included by piece and another solar battery sheet.

Illustratively, above-mentioned conducting connecting part 102 with a thickness of 0.01mm-0.2mm, width 0.6mm-12mm.It compares It is in the size of traditional silvery main gate line, above-mentioned conductive connecting 102 also smaller, reduce to solar battery sheet 100 by Smooth surface is blocked, to improve the transfer efficiency of solar battery sheet 100.

It is understood that as Figure 1-Figure 4, first confluence 11 is connected by conduction in above-mentioned solar battery sheet 100 The guidance of fitting 100 extremely second transparency conducting layer 80 surface far from second doped layer 70 coplanar with the second confluence 91.Change sentence It talks about, above-mentioned first confluence 11 and the second confluence 91 have been positioned at the same face of solar battery sheet 100, therefore, the sun The one side of energy cell piece 100 realizes the series connection of two neighboring solar battery sheet 100 using conductive connecting 210, can reduce and lead Influence of the electric connection line 210 to the light-receiving surface of solar battery sheet 100, to improve the photoelectric conversion of solar battery sheet 100 Efficiency.

The first confluence 11 is different with the shape of the second confluence 91 in Fig. 6, is intended merely to difference 11 He of the first confluence Second confluence 91 is not construed as limiting the shape of the first confluence 11 and the second confluence 91.

In some embodiments, above-mentioned conductive connecting 210 is made using copper strips.Copper strips can be pure copper strips or plating Tin copper strips, is of course not solely limited to this.

Illustratively, the outside of above-mentioned conductive connecting 210 coats one layer of insulating materials.Such as: the insulating materials is preferred For rubber or plastics.

Included by a solar battery sheet in above-mentioned multiple battery substrings in two neighboring solar battery sheet 100 Conducting connecting part 200 when being electrically connected with second electrode 90 included by another solar battery sheet, need to will only be conductively connected The mode of the insulating materials spot welding or dispensing of the end of line 210 and low-temperature setting cooperation exposes internal tin-coated copper strip, thus Guarantee electric conductivity.

In some embodiments, above-mentioned spot welding temperature is no more than 200 degree.Above-mentioned low-temperature setting temperature is no more than 220 degree.

In addition, leading as shown in fig. 7, above-mentioned when conductive connecting 210 is electrically connected with two neighboring battery substring 200a The mode of the external setting insulating film of electric connection line 210 realizes insulation, and the insulating film is ethylene-vinyl acetate copolymer (ethylene-vinyl acetate copolymer, be abbreviated as EVA) material layer, polyvinyl butyral (polyvinyl Butyral is abbreviated as PVB) material layer or DNP (Dai Nippon Printing, be abbreviated as DNP) material layer.

As shown in figure 5, some embodiments of the disclosure also provide a kind of photovoltaic module 300.The photovoltaic module 300 is from top to bottom It successively include foreboard 310, the first adhesive layer 320, solar battery string 200, the second adhesive layer 330 and backboard 340.The solar energy Battery strings 200 are the solar battery string 200 that any of the above-described embodiment provides.

Compared with prior art, the beneficial effect for the photovoltaic module 300 that some embodiments of the disclosure provide and the above-mentioned sun The beneficial effect of energy cell piece 100 is identical, and this will not be repeated here.

In some embodiments, above-mentioned first adhesive layer 320 and the second adhesive layer 330 are ethene-vinyl acetate copolymerization Object (ethylene-vinyl acetate copolymer, be abbreviated as EVA) material layer, polyvinyl butyral (polyvinyl Butyral is abbreviated as PVB) material layer, polyolefin elastomer (polyolefin elastomer, be abbreviated as POE) material layer or Thermoplastic silicone layer.

Be described in detail the structure, feature and effect of the disclosure based on the embodiments shown in the drawings, it is above only For the preferred embodiment of the disclosure, but the disclosure does not limit the scope of implementation as shown in the drawings, all conception institutes according to the disclosure The change or equivalent example modified to equivalent change of work should all when not going beyond the spirit of the description and the drawings In the protection scope of the disclosure.

Claims

1. a kind of solar battery sheet characterized by comprising conducting connecting part and the first electricity successively arranged from top to bottom Pole, the first transparency conducting layer, the first doped layer of the first conductive type, the first passivation layer, monocrystalline silicon piece, the second passivation layer, second The second doped layer, the second transparency conducting layer and the second electrode of conductivity type, wherein

One end of the conducting connecting part is electrically connected with the first electrode, and the other end of the conducting connecting part extends to described Second transparency conducting layer adjacent to the side of the second electrode, the conducting connecting part respectively with second transparency conducting layer and The second electrode mutually insulated.

2. solar battery sheet according to claim 1, which is characterized in that first doped layer and second doping Layer forms pn-junction and closes.

3. solar battery sheet according to claim 1, which is characterized in that the first electrode includes a plurality of first grid Line, a plurality of first grid line are met at together, and the intersection of a plurality of first grid line forms the first confluence, the conduction Connector is electrically connected with first confluence.

4. solar battery sheet according to claim 3, which is characterized in that each of described a plurality of first grid line first The width of grid line is 30 μm -90 μm.

5. solar battery sheet according to claim 1, which is characterized in that the second electrode includes a plurality of second gate Line, a plurality of second grid line are met at together, and the intersection of a plurality of second grid line forms the second confluence.

6. solar battery sheet according to claim 5, which is characterized in that each of described a plurality of second grid line second The width of grid line is 30 μm -90 μm.

7. solar battery sheet according to claim 5, which is characterized in that it is logical to offer first on the monocrystalline silicon piece Hole offers the second through-hole on first passivation layer, and third through-hole, second passivation are offered on first doped layer Fourth hole is offered on layer, fifth hole is offered on second doped layer, is offered on first transparency conducting layer 6th through-hole offers the 7th through-hole, the first through hole, second through-hole, described on second transparency conducting layer Three through-holes, the fourth hole, the fifth hole, the 6th through-hole and the 7th through-hole constitute through hole, described to lead Electrical connector is arranged in the through hole.

8. solar battery sheet according to claim 7, which is characterized in that second transparency conducting layer is for contacting institute The inner wall on the surface and the through hole of stating conducting connecting part is provided with insulating film；Or

The insulated hole of cyclic structure is offered on second transparency conducting layer；The insulated hole the monocrystalline silicon piece wherein The orthographic projection that plane where one face is formed is cyclic annular orthographic projection, the through hole plane where one of face just Projection and the conducting connecting part are respectively positioned on the cyclic annular orthographic projection in the orthographic projection of plane where one of face and are enclosed At region in；Second confluence is located at the cyclic annular orthographic projection institute in the orthographic projection of plane where one of face Outside the region surrounded.

9. solar battery sheet according to claim 7, which is characterized in that the quantity of the through hole be it is multiple, it is described The quantity of conducting connecting part is multiple；Multiple conducting connecting parts are located at correspondingly in multiple through holes；The multiple perforation Hole is arranged according to n × n array, and n is the integer more than or equal to 3.

10. -9 described in any item solar battery sheets according to claim 1, which is characterized in that the conducting connecting part is silver Connector made of slurry is recorded, and/or

First doped layer is the base and doped layer of N-type amorphous silicon, and second doped layer is the base and doped layer of P-type non-crystalline silicon, and/or

11. a kind of preparation method of solar battery sheet characterized by comprising

First through hole is opened up on monocrystalline silicon piece, the monocrystalline silicon piece includes opposite the first face and the second face；

The first passivation layer and the first doped layer are sequentially formed in first face, sequentially forms the second passivation layer in second face With the second doped layer；

The first transparency conducting layer is formed far from the surface of first passivation layer in first doped layer；In second doping Layer forms the second transparency conducting layer far from the surface of second passivation layer；

First electrode is prepared far from the surface of first doped layer in first transparency conducting layer；It transparent is led described second Electric layer prepares second electrode far from the surface of second doped layer；When preparing the first electrode or prepare it is described second electricity Preparation is located at the conducting connecting part in the first through hole when pole, so that one end of the conducting connecting part and the first electrode Connection, the other end of the conducting connecting part extend to second transparency conducting layer adjacent to the side of the second electrode.

12. the preparation method of solar battery sheet according to claim 11, which is characterized in that

It is described to sequentially form the first passivation layer in first face and the first doped layer includes: to be sequentially depositing in first face One passivation layer and the first doped layer, so that first passivation layer includes the second through-hole, first doped layer is logical comprising third Hole, the first through hole, second through-hole and the third through-hole are overlapped in the orthographic projection of plane where first face；

It is described to sequentially form the second passivation layer in second face and the second doped layer includes: to be sequentially depositing in second face Two passivation layers and the second doped layer, so that second passivation layer includes fourth hole, second doped layer includes the 5th logical Hole, the first through hole, the fourth hole and the fifth hole are overlapped in the orthographic projection of plane where second face；

It is described first doped layer far from first passivation layer surface formed the first transparency conducting layer include: described First doped layer deposits the first transparency conducting layer far from the surface of first passivation layer, so that the first transparency conducting layer packet Containing the 6th through-hole, the first through hole and the 6th through-hole are overlapped in the orthographic projection of plane where first face；

Surface second transparency conducting layer of formation being laminated in second doped layer far from second passivation includes: in institute It states the second doped layer and deposits the second transparency conducting layer far from the surface of the second passivation stacking, so that second electrically conducting transparent Orthographic projection of the layer comprising the 7th through-hole, the first through hole and the 7th through-hole in plane where second face is overlapped；

The first through hole, second through-hole, the third through-hole, the fourth hole, the fifth hole, the described 6th Through-hole and the 7th through-hole form through hole；

It is described to prepare first electrode and described described far from the surface of first doped layer in first transparency conducting layer Second transparency conducting layer is gradually carried out far from the surface preparation second electrode of second doped layer；

The preparation when preparing the first electrode or when preparing the second electrode is located at the conduction in the first through hole Connector includes:

Preparation is located at the conducting connecting part in through hole when preparing the first electrode or when preparing the second electrode.

13. the preparation method of solar battery sheet according to claim 12, which is characterized in that transparent led forming second After electric layer, before preparing the first electrode and the second electrode, the preparation method of the solar battery sheet is also wrapped It includes:

The inner wall of the through hole is formed by the material of the first transparency conducting layer using etching process or laser etching process The material of material and the second transparency conducting layer removes；Or,

It is used to contact the surface preparation insulation of conducting connecting part in the inner wall of the through hole and second transparency conducting layer Film.

14. the preparation method of solar battery sheet according to claim 12, which is characterized in that transparent led forming second After electric layer, before preparing the first electrode and the second electrode, the preparation method of the solar battery sheet is also wrapped It includes:

The insulated hole of cyclic structure is opened up on second transparency conducting layer, so that the insulated hole is in plane where the second face The orthographic projection of formation is cyclic annular orthographic projection, what the 7th through-hole included by the through hole was formed in plane where second face Orthographic projection is located in the cyclic annular orthographic projection area defined, and the 7th through-hole is in second face included by the through hole The orthographic projection of place plane and the conducting connecting part the orthographic projection of plane where second face be respectively positioned on it is described it is cyclic annular just It projects in area defined.

15. the preparation method of solar battery sheet according to claim 14, which is characterized in that the through hole and described The quantity of insulated hole is multiple；Multiple through holes are located at correspondingly in the orthographic projection that plane where second face is formed The multiple insulated hole is in the cyclic annular orthographic projection area defined that plane where second face is formed.

16. the preparation method of solar battery sheet according to claim 15, which is characterized in that described on monocrystalline silicon piece Open up first through hole include: multiple first through hole are formed on monocrystalline silicon piece by the way of laser boring, and/or

Using silk-screen printing technique in surface printing a plurality of first of first transparency conducting layer far from first doped layer Grid line forms the first electrode；A plurality of first grid line crosses to form multiple first confluences, the multiple first confluence Point is located at the through hole in plane where first face in the orthographic projection of plane where first face correspondingly In orthographic projection；And/or

Using silk-screen printing technique in surface printing a plurality of second of second transparency conducting layer far from second doped layer Grid line forms the second electrode, and a plurality of second grid line crosses to form multiple second confluences, the multiple second confluence Point plane where second face orthographic projection be located at correspondingly the multiple insulated hole where second face put down Face is formed by outside the difference that cyclic annular orthographic projection is surrounded；And/or

In the printing a plurality of first grid line or when printing a plurality of second grid line, into the multiple through hole Record silver paste；

The silver paste recorded in the multiple through hole is dried, so that the silver paste recorded in the multiple through hole is solid Change, multiple conducting connecting parts is obtained, so that the multiple conducting connecting part is located at correspondingly in the multiple through hole.

17. a kind of solar battery string characterized by comprising multiple described in any item solar-electricities of claim 1-10 Pond piece, wherein multiple solar battery sheets are electrically connected.

18. solar battery string according to claim 17, which is characterized in that the series connection of the multiple solar battery sheet or It is connected in parallel；Or

19. solar battery string according to claim 18, which is characterized in that the solar battery string further includes being used for The interconnecting strip of multiple battery substrings in parallel；Two neighboring solar battery sheet in each battery substring in the multiple battery substring In the conducting connecting part of a solar battery sheet and the second electrode of another solar battery sheet between by it is conductive even Wiring electrical connection.

20. a kind of photovoltaic module, which is characterized in that the photovoltaic module successively includes foreboard, the first adhesive layer, too from top to bottom Positive energy battery strings, the second adhesive layer and backboard；Wherein, the solar battery string is that claim 17-19 is described in any item Solar battery string.