CN204230278U

CN204230278U - Solar cell

Info

Publication number: CN204230278U
Application number: CN201420763490.6U
Authority: CN
Inventors: 简荣吾
Original assignee: Inventec Solar Energy Corp
Current assignee: Inventec Solar Energy Corp
Priority date: 2014-12-08
Filing date: 2014-12-08
Publication date: 2015-03-25
Anticipated expiration: 2024-12-08

Abstract

A kind of solar cell, comprises many bus electrodes, is set parallel to each other on the sensitive surface of the substrate of solar cell.Any one of wherein these many bus electrodes is connected with non-perpendicular fashion with many finger electrodes be set parallel to each other on the sensitive surface of the substrate of solar cell.

Description

Solar cell

Technical field

The utility model relates to area of solar cell, particularly relates to a kind of bus electrode solar cell of being connected non-perpendicular with finger electrode.

Background technology

Lack of energy is day by day serious, adds that various countries' environmental consciousness comes back, there's no one who doesn't or isn't payes attention to the problem that the exploitation of the renewable energy resources, particularly sunlight do not have energy depletion.Therefore, solar cell receives great concern, while pursuit photoelectric conversion efficiency, reduces costs the important goal also becoming research and development.

Refer to Fig. 1, Fig. 1 is the profile of known solar cell.Known solar cell 100 comprises semiconductor substrate 10, has P-N bonding land 15 in semiconductor substrate 10.When illumination is incident upon the front 10a of substrate 10, electronics and the electric hole of semiconductor element such as silicon atom can be separated from one another, form internal electric field and produce drift current in P-N bonding land 15.For the current lead-through that solar energy is converted to, need in semiconductor substrate 10 front 10a, configuration finger-like (finger) electrode 11 and bus electrode (busbar) 12 as anode electrode, and configure cathode electrode 14 in substrate 10 back side 10b.Wherein, the electric current of finger electrode 11 is mainly collected conducting by bus electrode 12.In general, finger electrode 11 is fine rule parallel to each other, is vertically connected to bus electrode 12.

The finger electrode 11 of current solar cell and the making of bus electrode 12, mainly by metal-to-metal adhesive through the half tone designed, the substrate 10 front 10a of solar cell 100 is printed on screen printing processing, and utilize high temperature sintering, make between electrode material with semiconductor substrate 10, to form good nurse difficult to understand and contact.But, electrically quite important for finger electrode 11 of the quality of screen printing processing.If the width of finger electrode 11 is wide, highly not enough, also or bad generations of wire mark break, all produce negative impact by the efficiency of solar cell.The half tone design of screen printing processing, the direction of advance of parallel for the direction of finger electrode screen printing scraper is controlled the finger electrode after wire mark 11 cross section symmetric shape by general system.But along with half tone uses to end of lifetime, the loss gradually of opening latex, be easy to the defect producing hachure node, the half tone being forced to need more to renew is with the production that continues.The replacing of half tone often accounts for the very important ratio of production cost.

In addition, known finger electrode 11 is fine rule parallel to each other, and is vertically connected to bus electrode 12, as shown in Figure 2.For p-type solar cell, minority carrier (electronics) 23 is pushed into emitter-base bandgap grading by junction electric field, then moves to finger electrode 11, regathers to become to bus electrode 12 to produce the electric current of electric power.Motion due to minority carrier 23 is complete at random direction-free, and therefore the finger electrode 11 of straight line parallel to each other is not the design of collection efficiency the best.For example, in fig. 2, the probability that the direction of motion a of minority carrier 23, b, c are collected into is respectively p (a), p (b), p (c).Particularly the move distance of the minority carrier 23 of direction c is no better than the length of finger electrode 11.The move distance of minority carrier 23 before being collected is longer, and the chance also representing carrier compound (re-combination) is again higher, collected current will be made to decline, be unfavorable for solar cell power generation efficiency.

In order to solve above-mentioned shortcoming, the utility model provides a kind of bus electrode and finger electrode the non-perpendicular solar cell be connected, and can improve solar cell power generation efficiency and extend useful life of half tone.

Utility model content

In view of this, an object of the present utility model is to provide a kind of solar cell, and it uses bus electrode and the finger electrode of non-perpendicular connection, can improve solar cell power generation efficiency.

Another object of the present utility model is to provide a kind of solar cell, and it uses bus electrode and the finger electrode of non-perpendicular connection, can extend the useful life of half tone.

For achieving the above object, the utility model provides a kind of solar cell, comprises many bus electrodes, is set parallel to each other on the sensitive surface of the substrate of solar cell.Any one of wherein these many bus electrodes is connected with non-perpendicular fashion with many finger electrodes be set parallel to each other on the sensitive surface of the substrate of solar cell.

For above and other object of the present utility model, feature and advantage can be become apparent, preferred embodiment cited below particularly, and coordinate institute's accompanying drawings, be described in detail below.

Accompanying drawing explanation

Fig. 1 is the profile of known solar cell;

Fig. 2 is the finger electrode of known solar cell and the configuration schematic diagram of bus electrode;

Fig. 3 A is the top view of the solar cell of the utility model one specific embodiment;

Fig. 3 B is the finger electrode of the solar cell of Fig. 3 A and the detailed configuration schematic diagram of bus electrode;

Fig. 4 A is the top view of the solar cell of another specific embodiment of the utility model; And

Fig. 4 B is the finger electrode of the solar cell of Fig. 4 A and the detailed configuration schematic diagram of bus electrode.

Embodiment

For main idea of the present utility model is described, refer to Fig. 3 A, it is the top view of the solar cell 300 of the utility model one specific embodiment.As shown in Figure 3A, solar cell 300 comprises many bus electrodes 32, is set parallel to each other on the sensitive surface of the substrate (not illustrating) of solar cell 300.Any one of wherein these many bus electrodes 32 is connected with non-perpendicular fashion with many finger electrodes 31 be set parallel to each other on the sensitive surface of the substrate of solar cell 300.Must be noted that in this specific embodiment, therefore but be not limited to, the example of three bus electrodes 32 is as explanation.But have in the art and usually know the knowledgeable, not departing from spirit and scope of the present utility model, when being used for a variety of modifications and variations, therefore protection range of the present utility model is when be as the criterion depending on the accompanying claim person of defining.

In certain embodiments, many finger electrodes 31 of the solar cell 300 of Fig. 3 A are Z-shaped repetitiousness bending.Wherein, between the connection angle of any one and many finger electrodes 31 of many bus electrodes 32 is spent between 20 to 80.Preferably, between the connection angle of any one and many finger electrodes 31 of many bus electrodes 32 is spent between 30 to 70.

For further illustrating advantage of the present utility model, refer to Fig. 3 B, it is the finger electrode 31 of the solar cell of Fig. 3 A and the detailed configuration schematic diagram of bus electrode 32.In figure 3b, the probability that direction of motion a ', the b ' of minority carrier 33, c ' are collected into is respectively p (a '), p (b '), p (c ').Compared with prior art Fig. 2, the move distance of the minority carrier 33 of direction c ' significantly reduces.Therefore, in this specific embodiment, and utilize the design of the finger electrode 31 of Z-shaped repetitiousness bending to increase probability p that c ' direction minority carrier 33 is collected into (c '), thus promote solar cell power generation efficiency.

On the other hand, because finger electrode 31 is non-parallel also non-perpendicular with the direction of advance of screen printing scraper, therefore in wire mark process metal-to-metal adhesive not easily excessive accumulation in pattern openings position.When the direction of advance with scraper forms suitable angle (such as 5 ~ 10 degree), the rolling effect of metal-to-metal adhesive is conducive to the carrying out of wire mark, and then finger electrode 31 shape quality that wire mark is formed is better and extend useful life of half tone.

The utility model more provides another specific embodiment.Refer to Fig. 4 A, it is the top view of the solar cell 400 of another specific embodiment of the utility model.As shown in Figure 4 A, solar cell 400 comprises many bus electrodes 42, is set parallel to each other on the sensitive surface of the substrate (not illustrating) of solar cell 400.Any one of wherein these many bus electrodes 42 is connected with non-perpendicular fashion with many finger electrodes 41 be set parallel to each other on the sensitive surface of the substrate of solar cell 400.Must be noted that in this specific embodiment, therefore but be not limited to, the example of three bus electrodes 42 is as explanation.But have in the art and usually know the knowledgeable, not departing from spirit and scope of the present utility model, when being used for a variety of modifications and variations, therefore protection range of the present utility model is when be as the criterion depending on the accompanying claim person of defining.

In certain embodiments, many finger electrodes 41 of the solar cell 400 of Fig. 4 A are undaform repetitiousness bending.Wherein, between the connection angle of any one and many finger electrodes 41 of many bus electrodes 42 is spent between 20 to 80.Preferably, between the connection angle of any one and many finger electrodes 41 of many bus electrodes 42 is spent between 30 to 70.

For further illustrating advantage of the present utility model, refer to Fig. 4 B, it is the finger electrode 41 of the solar cell of Fig. 4 A and the detailed configuration schematic diagram of bus electrode 42.In figure 4b, the direction of motion a of minority carrier 43 ", b ", c " probability that is collected into is respectively p (a "), p (b "), p (c ").Compared with prior art Fig. 2, direction c " the move distance of minority carrier 43 significantly reduce.Therefore, in this specific embodiment, utilize the design of undaform repetitiousness forniciform finger electrode 41 to increase c " probability p (c ") that direction minority carrier 43 is collected into, thus promote solar cell power generation efficiency.

On the other hand, because finger electrode 41 is non-parallel also non-perpendicular with the direction of advance of screen printing scraper, therefore in wire mark process metal-to-metal adhesive not easily excessive accumulation in pattern openings position.When the direction of advance with scraper forms suitable angle (such as 5 ~ 10 degree), the rolling effect of metal-to-metal adhesive is conducive to the carrying out of wire mark, and then finger electrode 41 shape quality that wire mark is formed is better and extend useful life of half tone.

In sum, the utility model provides a kind of solar cell, and it uses bus electrode and the finger electrode of non-perpendicular connection, can improve solar cell power generation efficiency, and can extend the useful life of half tone.

Although the utility model discloses as above with specific embodiment; so itself and be not used to limit the utility model; have in the utility model art and usually know the knowledgeable; not departing from spirit and scope of the present utility model; when being used for a variety of modifications and variations, therefore protection range of the present utility model is when being as the criterion depending on the accompanying claim person of defining.

Claims

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

Many bus electrodes, are set parallel to each other on the sensitive surface of a substrate of described solar cell;

Any one of wherein said many bus electrodes is connected with non-perpendicular fashion with many finger electrodes be set parallel to each other on the sensitive surface of the described substrate of described solar cell.

2. solar cell as claimed in claim 1, it is characterized in that, described many finger electrodes are Z-shaped bending repeatedly.

3. solar cell as claimed in claim 2, is characterized in that, between the connection angle of any one and described many finger electrodes of described many bus electrodes is spent between 20 to 80.

4. solar cell as claimed in claim 2, is characterized in that, between the connection angle of any one and described many finger electrodes of described many bus electrodes is spent between 30 to 70.

5. solar cell as claimed in claim 1, it is characterized in that, described many finger electrodes are undaform alternating bending shape.

6. solar cell as claimed in claim 5, is characterized in that, between the connection angle of any one and described many finger electrodes of described many bus electrodes is spent between 20 to 80.

7. solar cell as claimed in claim 5, is characterized in that, between the connection angle of any one and described many finger electrodes of described many bus electrodes is spent between 30 to 70.