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Back passivation solar cell back silver paste and preparation method thereof, and solar cell and preparation method thereof

A technology for solar cells and back silver paste, applied in the field of solar cells, can solve the problems of low adhesion strength between back electrodes and silicon, and the peeling test fails to meet industry requirements, and achieves the effect of improving photoelectric conversion efficiency and good adhesion.

Active Publication Date: 2016-03-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems that the adhesion strength between the back electrode and silicon is not high and the peeling test fails to meet the industry requirements when the conventional backlight silver conductive paste in the prior art is used on the back passivated crystalline silicon solar cell. Thereby provide a kind of silver conductive paste on the backlight surface of the crystalline silicon solar cell suitable for backside passivation and protection

Method used

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  • Back passivation solar cell back silver paste and preparation method thereof, and solar cell and preparation method thereof

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Experimental program
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Effect test

Embodiment approach

[0029] As a preferred embodiment of the present invention, the back passivation solar cell back silver slurry also contains dispersant, which promotes the uniform dispersing of each component in the back silver slurry.In the case of better selection, the backwipes of the back passivation solar cells are used as the benchmark, and the content of the dispersant is 0.1-1 weight.Among them, the dispersion agent can be selected from one or more of polyethylene pyrirol (PVP), polyacrylamide, cellulose derivatives, and triangular hex phosphates.

[0030] The present invention also provides a preparation method for the backwatch solar battery back silver pulp, including the dispersion of micron silver powder, nano silver powder, and inorganic glass powder in the organic carrier.material.

[0031] Because the back passivation solar battery back silver slurry provided by the present invention also contain nano -silver powder, and nano silver powder is prone to self -reunion due to its small...

Embodiment 1

[0046] (1) Preparation of inorganic glass powder SA1

[0047] Take 90 weight PBO, 10 weight B 2 O 3 Use the V -type hybrid machine to mix well, put it into the porcelain cricket, put it in a silicon carbon rod furnace, heat the heat to 550 ° C, heat preservation 0.5h, then rise to 1200 ° C, melted for 1.0 hours, water quenching, filtering, will get it will get it will get it.The glass beads are loaded into the ball mill, controlled the quality ratio, oxidized ball: glass beads: ion water = 4: 1.5: 0.6, the pot speed of 380 rpm, the ball grind for 6 hours, filter, dry, dry glass powder, get inorganic glass powderSA1, testing the particle size D 50 It is 1.50μm, D 100 For 8.28 μm, test the softening temperature on the expansion curve of the inorganic glass powder SA1 T f It is 300 ° C.

[0048] (2) Preparation of organic carriers

[0049] According to the quality ratio is butylka must be alcohol: butyl -oligraxinate: pine oil: diode (DBP) = 45: 30: 20: 5, the proportion of organic s...

Embodiment 2

[0055] The same steps are used to use the same steps 1, the difference is:

[0056] In the step (3), take 66 weights steps (2) prepared organic carrier, and then add 30 nano -silver powder and 4 -weight dispersion PVP, stir well, and then use a sand mill for sand grinding to test it to test it to test it to test it to test it to test it to test it to test it to test it.The fineness is less than 3 ~ 5 μm, that is, the nano silver slurry SB2;

[0057] In the step (4), the nano silver slurry SB1 is replaced by the nano silver slurry SB2.

[0058] Through the above steps, the back passivation solar battery back silver slurry of this embodiment is obtained as S2.

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Abstract

The invention provides a back passivation solar cell back silver paste and a preparation method thereof. The paste includes micrometer silver powder, nanometer silver powder, inorganic glass powder, and an organic carrier, the inorganic glass powder is formed by a 80-92 wt% component X and a 8-20 wt% component Y, the component X is PbO and / or Bi2O3, and the component Y is B2O3. According to the back passivation solar cell back silver paste and the preparation method thereof, the back silver paste is printed on the backside of a back passivation silicon substrate, a smooth and compact back electrode can be formed, the adhesion between the back electrode and the silicon substrate is good, a welding pulling force test with a photovoltaic welding strip is in accordance with the requirement of the current photovoltaic industry, and the photoelectric conversion efficiency of solar cells prepared by employing the back silver paste is effectively improved.

Description

Technical field [0001] The present invention involves the field of solar cell technology, which specifically involves a method of back passivation solar cell back silver slurry and its preparation methods, the method of using the backwipes solar battery back silver slurry system, and solar energy prepared by this methodBattery. Background technique [0002] With the development and competition of the solar industry, customers' efficiency requirements for solar cells are getting higher and higher, and the threshold for industry access is also improving. Therefore, more industrialized technologies need to be explored to improve the efficiency of solar cell conversion.At present, the frontal technology of solar batteries is very mature, and the focus of improving the efficiency of conversion has gradually shifted to the back of the back.The back passivation battery of the back passivation battery of the aluminum passivation layer on the back of the atomic layer deposition (ALD) tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/18H01L31/0224
CPCY02P70/50
Inventor 谭伟华鹿兆岩左静
Owner BYD CO LTD
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