CN201112391Y

CN201112391Y - Electrode of solar energy battery

Info

Publication number: CN201112391Y
Application number: CNU2007201285865U
Authority: CN
Inventors: 王中林
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-08-17
Filing date: 2007-08-17
Publication date: 2008-09-10
Anticipated expiration: 2017-08-17

Abstract

The utility model discloses an electrode of a solar battery, which comprises a conducting adhesive layer, and a metal layer positioned on the conducting adhesive layer, wherein the metal layer can not only conduct electricity, but also can be welded, so as to improve the deficiency of prior electrode structure and simplify the manufacturing process of prior electrode.

Description

The electrode of solar cell

Technical field

The utility model relates to a kind of solar cell, relates in particular to a kind of improvement of electrode of solar cell.

Background technology

Because the fossil fuel resource little by little reduces, problem of environmental pollution is also serious day by day, so people are seeking other alternative energy always, as tidal force, nuclear energy, solar energy etc., to reduce for a long time dependence to fossil energy, and solar energy source and other alternative energy sources are in comparison, be not to be subjected to regional restriction, therefore more can be subjected to extensive utilization.

Wherein, solar cell is again the main achievement that realizes the solar energy source exploitation, the solar cell principle is based on photovoltaic effect (photovoltaic effect), promptly utilize sunlight and material to interact and produce electric energy, and main material that solar cell adopts is a conducting resinl, as elargol, aluminium glue, and semi-conducting material, as monocrystalline silicon, the silicon wafer material of polysilicon and amorphous silicon or the semi-conducting material of III-V compounds of group etc., wherein elargol mainly is the electrode that can be used as the front and back of solar cell, and the back electrode structure is to have several aluminium glue and elargol is located on the silicon wafer material.

The cost of elargol is very high, and the fabrication schedule of back electrode structure is complicated again, as shown in Figure 1, provide a silicon wafer material 2 earlier, need on silicon wafer material 2, to measure, plan each road aluminium glue, elargol position, required width then, then as shown in Figure 2, three road aluminium glues 4 are imprinted on the silicon wafer material 2, at last will be with behind the careful interval location of aiming between two aluminium glues 5 of elargol, just twice elargol 6 is printed on the silicon wafer material 2 and finishes the back electrode structure, wherein also can print elargol earlier, print aluminium glue again.So the fabrication schedule of whole back electrode is quite loaded down with trivial details, must need with the position of aluminium glue and elargol be provided with very accurate, chemically react with the joint of avoiding aluminium glue and elargol, and influence conductive effect.

The utility model content

The purpose of this utility model is to provide a kind of electrode of solar cell of innovation, it is that a metal level is set directly on the aluminium glue layer, and then the manufacture process of simplification back electrode, enhance productivity, and metal level is to adopt lower-cost material, so can help the reduction of integral production cost again.

Electrode according to solar cell provided by the utility model, be to comprise a conductive adhesive layer, and a metal level is positioned on the conductive layer, wherein the material of metal level be can be soldered material, as copper or copper alloy etc., and adopt the mode of long-pending (PVD) method in physical vapor Shen, galvanoplastic, electroless plating method or displacement plating method that metal level is formed on the conductive adhesive layer.

The utlity model has following beneficial effect:

The electrode of solar cell provided by the utility model is a kind of back electrode structure simple in structure, can simplify numerous and diverse fabrication schedule of existing back electrode, lifting to help production efficiency, and the metal level that is provided not only can be used as conductive electrode, can be used as weld layer again, in addition, owing to be to adopt the full wafer metal level to cover on the conductive adhesive layer, so it is big that the scope that can be welded just becomes, and can on the full wafer metal level, weld everywhere, have the awkward situation that sticks to several parallel elargol of back electrode structure and weld inconvenience now to solve.In addition, can utilize the lower and conductivity of cost, the good metal level of thermal conductivity again, replace existing expensive elargol as the conductive electrode that can be welded, reduce cost as copper, copper alloy.

Description of drawings

Fig. 1, Fig. 2 and Fig. 3 are the manufacturing flow charts of the back electrode structure of solar cell in the prior art;

Fig. 4 is a solar battery structure schematic diagram of the present utility model;

Fig. 5 is the back electrode structural representation of solar cell of the present utility model.

[figure number explanation]

2 silicon wafer materials

4 aluminium glues

5 positions

6 elargol

10 crystal silicon solar energy batteries

12 p type semiconductor layers

14 n type semiconductor layers

16 back electrodes

161 conductive adhesive layers

162 metal levels

18 metal grid lines

Embodiment

The utility model provides a kind of electrode of solar cell, and it is the back electrode as solar cell, and for ease of technical characterictic of the present utility model and purpose are described, below be with crystal silicon solar energy battery as embodiment, but be not limited to this.

Cooperation is graphic below is described in detail as follows the utility model preferred embodiment.

Please refer to Fig. 4, is a kind of structural representation of crystal silicon solar energy battery.As shown in the figure, crystal silicon solar energy battery 10 of the present utility model is to comprise a p

type semiconductor layer

12,14 of one n type semiconductor layers are on p

type semiconductor layer

12, and 16 of back electrodes are below p type semiconductor layer 12, and on n type semiconductor layer 14, be provided with plural metal grid lines 18, with as front electrode.And, please together with the enlarged diagram of the back electrode structure of reference Fig. 5, show that back electrode 16 is to comprise that a conductive adhesive layer 161 is located on the p type semiconductor layer 12, wherein but the material of conductive adhesive layer 161 is can adopt as aluminium glue or contain the conductive material of the glue etc. of aluminium, and conductive adhesive layer 161 is as a back of the body surface field (back surfacefield with the face that connects of p type semiconductor layer 12, BSF), the collection and the recovery that are used to increase carrier do not have absorbed photon, and then the efficient of raising solar cell, and one 162 of metal levels on conductive adhesive layer 161 and cover conductive adhesive layer 161, wherein the material of metal level 162 be selected from can be soldered material, as be selected from by copper, silver, gold, copper alloy, the group that silver alloy and billon etc. are formed, therefore metal level 162 not only can be used as conductive electrode, again with the effect of weld layer, to be used to provide and the extraneous weld that is connected, has simultaneously good heat-conducting effect again, in addition, be to see through long-pending (PVD) method in physical vapor Shen, galvanoplastic, electroless plating method or displacement plating method are formed on metal level 162 on the conductive adhesive layer 161.Wherein, metal level 162 can based on lower-cost copper, copper alloy, or also can contain the gold, silver material according to demand.

Therefore, the electrode of solar cell provided by the utility model is a kind of back electrode structure simple in structure, can simplify numerous and diverse fabrication schedule of existing back electrode, lifting to help production efficiency, and the metal level that is provided not only can be used as conductive electrode, can be used as weld layer again, in addition, owing to be to adopt the full wafer metal level to cover on the conductive adhesive layer, so it is big that the scope that can be welded just becomes, and can on the full wafer metal level, weld everywhere, have the awkward situation that sticks to several parallel elargol of back electrode structure and weld inconvenience now to solve.In addition, can utilize the lower and conductivity of cost, the good metal level of thermal conductivity again, replace existing expensive elargol as the conductive electrode that can be welded, reduce cost as copper, copper alloy.

More than disclosed only be several specific embodiment of the present utility model, still, the utility model is not limited thereto, any those skilled in the art can think variation all should fall into protection range of the present utility model.

Claims

1. the electrode of a solar cell is characterized in that, comprising:

One conductive adhesive layer; And

One metal level, it is positioned on the described conductive adhesive layer.

2. the electrode of solar cell as claimed in claim 1 is characterized in that, the material of described conductive adhesive layer is aluminium glue or the glue that contains aluminium.

3. the electrode of solar cell as claimed in claim 1 is characterized in that, described metal level is formed with the long-pending method in physical vapor Shen.

4. the electrode of solar cell as claimed in claim 1 is characterized in that, described metal level is formed with galvanoplastic.

5. the electrode of solar cell as claimed in claim 1 is characterized in that, described metal level is formed with the electroless plating method.

6. the electrode of solar cell as claimed in claim 1 is characterized in that, described metal level is formed with the displacement plating method.

7. the electrode of solar cell as claimed in claim 1 is characterized in that, the material of described metal level be can be soldered material.

8. the electrode of solar cell as claimed in claim 7 is characterized in that, described can soldered material be to be selected from the group that is made up of copper, silver, gold, copper alloy, silver alloy and billon.