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Yanzhi Solar cell TLM grid line contact resistance analyzer model: CHT-6070 TLM

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1) Test function

This device contains 2 test functions, which can place 18 samples at one time for automatic testing.

2) Test the contact resistance

For testing contact resistance, thin layer resistance, contact resistivity and other items,

3) Test the line resistance

To test the line resistance of the grid line, you can test the 5-10mm wide cut cells.

If the customer needs to test the line resistance of more than 10mm wide, need customized special platform.

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  • Product Features
  • Technical Parameters

Test Schematic Drawing (TLM) 

Contact resistance is an important aspect to be considered in solar cell electrode optimization. The size of the contact resistance is not only related to the pattern of the contact, but also related to the diffusion process and the sintering process. Measuring contact resistivity can reflect the problems in diffusion, electrode fabrication and sintering.

The testing equipment has two test functions: contact resistivity test and line resistance test, which can be used differently. The test principle is as follows:

测量电阻


The measured resistance consists of three parts:

1) The metal contact resistance of the probe and the electrode on both sides is Rm (considering <<Rc, negligible);

2) The contact resistance between the electrode and the studied material, Rc;

3) Square resistance Rsh of semiconductor materials.

By changing the electrode spacing d, the relationship curve between RTLM and d can be obtained, thus extracting the interface contact resistance Rc and the square resistance Rsh of the studied material.

Introduction to the probe tip

图4

graph 4


Figure 4 shows the contact resistance probe, the spacing between two adjacent probe axes can be selected in the range of 0.5mm and 3mm, and different spacing specifications can be customized according to user requirements.


5

graph 5


Figure 5 shows the line resistance probe, adjacent probe sets, outer axis spacing of 10mm,

The measurable grid line length is 10-50mm, and different spacing specifications can be customized according to user requirements.

Test distribution map

Thin Distribution-sheet resistance (Q / sq)


图7

graph 7


The upper above is the resistance distribution of the seven samples tested. Each film each tested 5 areas, with the depth of red to indicate the size of the thin layer of resistance, intuitively showing the size of the resistance.


Distribution map of the contact resistance-contact         resistance(Q)


图 8

graph 8


The figure above is the contact resistance distribution diagram of the seven test films. Each film was tested in 5 areas, with the depth of red to indicate the size of the thin layer of resistance, intuitively showing the size of the resistance.


Contact resistivity profile-pc (m Ω * cm2)


图9

graph 9


The figure above is the resistivity distribution of the seven test films. Each film was tested in 5 areas, with the depth of red to indicate the size of the thin layer of resistance, intuitively showing the size of the resistance.


Line Resistance Test Interface Drawing-line resistance (Q / cm)


图10

graph 10


The figure above is the interface diagram during testing the line resistance. The display on the right side of the interface shows the fraction of the line resistance of each line in a film.

Technical index of the TLM contact resistance

Suitable battery size

Cut cell of size 230mm and below

Measured sample width

5~10mm

Probe

There are the following options available:

Fixed probe head: processing according to customer size, processing range 0.5-3mm;

adjustable probe head: 4 specifications,

(1)0.9-1.0mm(2)1.0-1.2mm(2)1.2-1.8mm(3)1.8-2.5mm

Contact resistance measurement range

0~120Ω

Contact resistance measures repeatability

Better than 5% or 0.5 mQ * cm ^ 2

Technical index of line resistance (optional)

Suitable battery size

Cut cell of size 230mm and below

Measurable sample width

5-10mm, and other specifications need to be specially customized

Line resistance measurement range

0~40 Q/cm

Line resistance measures repeatability

Better than 5% or 0.20 / cm

Technical index of diffusion square resistance (optional)

Suitable battery size

Cell cells in size of 230mm and below

Measuring range

5×10-4～2×10⁵Q/□

Square resistance test for repeatability

Better than 3%

Solutions

 IEC61215

IEC61730

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