Perk high efficiency cell se laser back side resistance test pattern

Abstract

The application discloses a PERC high-efficiency cell SE laser rear side resistance test pattern, and test steps comprise the following: S1, pretreatment: firstly, five equal size square patterns are designed on a laser machine, then corresponding coordinates are fixed, and a four-probe square resistance tester is taken out for standby; S2, ensuring heavy doping: a four-probe test point is used to test a square position corresponding to a laser, so that it is ensured that each point of the test is a heavy doping area. The application designs five fixed size square patterns on a laser table, fixes coordinates, and then matches four-probe test coordinates, so that a five-point square resistance average value can be tested, so that in subsequent processing, accidentalness can be avoided, and time for testing square resistance of the whole surface and time for full-surface laser marking can be saved, so that the accuracy of square resistance testing and work efficiency are improved, and the application has high practicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, and in particular to a PERC high-efficiency battery SE laser rear-side resistance test pattern. BACKGROUND

[0002] With the strengthening of people's awareness of environmental protection, solar power generation is a clean and renewable resource, and photovoltaic cells are an important conversion carrier for solar power generation. Solar cells play a crucial role in photovoltaic power generation. With the gradual rise of PERC cells, the conversion efficiency of the cells is continuously improved, and the front laser has become an important process in the production of PERC cells. SE laser technology is now widely used in the production of PERC high-efficiency cells. SE is a principle of doping the PSG layer formed after diffusion as an impurity, and driving to achieve local re-doping. The subsequent process is not changed, and by controlling the size of the laser rear-side resistance, the ohmic contact of the cell can be improved and the damage to the lattice by the laser can be reduced, thereby improving the conversion efficiency of the cell. Therefore, laser rear-side resistance control is an essential control in battery production.

[0003] The battery SE laser rear-side resistance on the market is prone to abnormality. During processing, the occasional existence of the resistance cannot be effectively confirmed, and a long time and effort are required for testing the resistance in the subsequent process. The accuracy of the resistance test cannot be improved, and the work efficiency is low in the application process. SUMMARY

[0004] The present application provides a PERC high-efficiency battery SE laser rear-side resistance test pattern to overcome the shortcomings in the background art.

[0005] To solve the above problems, the following technical solution is adopted: a PERC high-efficiency battery SE laser rear-side resistance test pattern, the test method comprising the following steps:

[0006] S1, pretreatment: first design five equal-sized square patterns on the laser machine, then fix the corresponding coordinates, and take out a four-probe resistance tester for use;

[0007] S2, ensure re-doping: use the four-probe test points to test the corresponding laser-processed square positions, so as to ensure that each point tested is a re-doped area;

[0008] S3, confirm the position: after the front laser processing, the state of the laser pattern is observed by using a two-dimensional measuring instrument. The laser pattern is composed of a plurality of laser spots, and the laser spots are confirmed to be continuous, non-overlapping and saturated to a normal level. Then, the laser spots are used to fill the entire laser square area, and it is ensured that the five laser square areas are completely covered by the laser spots;

[0009] S4, start testing: after the laser processing forms a spot, the laser re-doped area is tested by using a four-probe tester, and the accuracy of the test data is ensured by repeating the test twice and calculating the average value of five test points.

[0010] Preferably, in step S1, the size of the square pattern is 50mm*50mm.

[0011] Preferably, in step S2, the test is repeated twice to ensure accuracy.

[0012] Preferably, in step S3, a test point matching the four-probe is further edited on the four-probe to ensure that the test point corresponds to the laser position.

[0013] Preferably, in step S4, the five-point data collected is recorded and averaged to obtain the front laser back resistance data.

[0014] The present application fixes the coordinates by designing five square patterns of fixed size on the laser table, and then matches the four-probe test coordinates with each other, so that the five-point sheet resistance average value can be tested, the laser back resistance data can be accurately and quickly tested, and the working time can be saved and the working efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The figure is a schematic diagram of the square pattern for testing the front laser resistance of the laser.

[0016] Figure 2 The figure is a schematic diagram of the four-probe tester sheet resistance test point. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described below, and obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] The present application provides a technical solution: a PERC high-efficiency cell SE laser back resistance test pattern,

[0019] The test method comprises the following steps:

[0020] S1, pretreatment: first, design five square patterns of equal size on the laser machine table, the size of the square pattern is 50mm*50mm, then fix the corresponding coordinates, and take out the four-probe sheet resistance tester for use;

[0021] S2, ensure heavy doping: use four-probe test point to test the corresponding laser-processed square position, so as to ensure that each point tested is a heavy doping area, and repeat the test twice to ensure accuracy;

[0022] S3, confirm position: after front laser processing, the state of the laser pattern needs to be observed by a two-dimensional measuring instrument, the laser spot is a single spot, the laser pattern is composed of several laser spots, the continuous spot is confirmed, there is no overlap, and the saturation reaches the normal level, then the laser spot is used to fill the entire laser square area in turn, and it is ensured that the five laser square areas are completely covered by the laser spot, and a test point matched with the laser position is edited on the four-probe, so as to ensure that the test point corresponds to the laser position;

[0023] S4, start testing: after the laser spot is formed by laser processing, the four-probe tester is used to test the laser heavy doping area, the accuracy of the test data is ensured by repeating the test twice and calculating the average value of the five test points, the five point data collected are recorded and averaged, and the data of the front laser back resistance is obtained.

[0024] In summary, the five fixed size square patterns are designed on the laser table to fix the coordinates, and then matched with the four-probe test coordinates, so that the five-point sheet resistance average value can be tested, so that the accidentalness in the subsequent processing process can be avoided, and the time for testing the entire sheet resistance and the time for filling the full surface laser can be saved, so as to improve the accuracy and working efficiency of testing the sheet resistance, greatly improve the accuracy of testing, and have high practicability.

[0025] The basic principles and main features of the present application and the advantages of the present application are shown and described above, and it is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0026] In addition, it should be understood that although the present application is described in the form of embodiments, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A PERC high efficiency cell SE laser back side resistance test pattern, characterized in that, The test method comprises the following steps: S1, pretreatment: first design five square patterns of equal size on a laser machine, then fix the corresponding coordinates, and take out a four-probe square resistance tester for use; S2, ensure heavy doping: use the four-probe test point to test the corresponding laser-processed square position, so as to ensure that each point tested is a heavy doping area; S3, confirm the position: after front laser processing, observe the state of the laser pattern by using a two-dimensional measuring instrument, the laser pattern is composed of a plurality of laser spots, confirm that the spots are continuous, have no overlap and the saturation reaches the normal level, then fill the entire laser square area with laser spots one by one, and ensure that the five laser square areas are completely covered by the laser spots; S4, start testing: after the laser processing forms the spots, use the four-probe tester to test the laser heavy doping area, through repeated testing twice and calculating the average value of the five test points, ensure the accuracy of the test data.

2. The test method of a PERC high-efficiency cell SE backside resistance test pattern according to claim 1, characterized in that, In step S1, the size of the square pattern is 50mm x 50mm. 3.The method of claim 1, wherein the PERC high-efficiency cell SE backside resistance test pattern is a pattern shown in FIG.

3. In step S2, repeat the test twice to ensure accuracy. 4.The method of claim 1, wherein the PERC high-efficiency cell SE backside resistance test pattern is a pattern shown in FIG.

4. In step S3, a test point matched with the four-probe is further edited, to ensure that the test point corresponds to the laser position.

5. The testing method of the PERC high-efficiency cell SE backside resistance test pattern according to claim 1, characterized in that, In step S4, record the five point data collected and calculate the average value as the data of the front laser square resistance.

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