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High-temperature binder and preparation method thereof

A high-temperature binder and modifier technology, used in photovoltaic power generation, electrical components, circuits, etc., can solve the problems of large thermal expansion coefficient and large bending degree of solar cells

Active Publication Date: 2015-03-11
GUANGDONG FENGHUA ADVANCED TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the sintering process, the role of the high-temperature binder in the front electrode paste is to etch through the anti-reflection film on the illuminated surface of the silicon wafer to obtain an ohmic contact between the front electrode and the N-type diffusion layer, and connect the front electrode to the silicon wafer. Bonding, so the thermal expansion coefficient of the high-temperature adhesive is directly related to the bending degree of the crystalline silicon solar cell. The current high-temperature adhesive has a large thermal expansion coefficient, which makes the solar cell bending degree larger

Method used

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  • High-temperature binder and preparation method thereof

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preparation example Construction

[0045] A preparation method for a high-temperature binder for solar cell electrodes, comprising the following steps:

[0046] Step S110, mixing each raw material to obtain a mixture.

[0047] The mixture is calculated by mass percentage and includes the following components:

[0048]

[0049] Among them, PbX 2 selected from Pb(NO 3 ) 2 , Pb(CH 3 COO) 2 , PbO 2 , PbCl 2 , PbF 2 at least one of; M 2 o 3 from Fe 2 o 3 、 Bi 2 o 3 、Er 2 o 3 , Yb 2 o 3 , Sb 2 o 3 , La 2 o 3 At least one of, NO is selected from at least one of MgO, CaO, BaO, ZnO; R 2 O is selected from Li 2 O, Na 2 O and K 2 At least one of O.

[0050] Preferably, each raw material is mixed and processed by using a sand mill.

[0051] Preferably, drying is performed after mixing.

[0052] Step S120, making the mixture into glass powder and then sieving to obtain an amorphous material.

[0053] Preferably, the operation of making the mixture into glass powder is as follows: heating and ...

Embodiment 1～5

[0072] In Examples 1 to 5, the high-temperature binder is composed of 98.2% amorphous material and 1.8% crystalline material, and the raw material mass percentage data of the amorphous material is shown in Table 1, wherein PbX 2 Pb(NO 3 ) 2 and PbO 2 mixture of M 2 o 3 Bi with a mass ratio of 5:3 2 o 3 and La 2 o 3 mixture of NO to MgO, R 2 O is Na 2 O, the crystal material is a mixed modified product of β-cristobalite and cordierite with a mass ratio of 1:2, and the modifier is triethanolamine and lecithin with a mass ratio of 1:1. The preparation method of binding agent comprises the steps:

[0073] 1), mix β-cristobalite and cordierite with a mass ratio of 1:2, add triethanolamine and lecithin with a mass ratio of 1:1 as a modifier, and the modifier is mixed with β-cristobalite and cordierite The mass ratio of the mixture was 3:100, the modification treatment time was 10 min, and the modification treatment temperature was 25° C., to obtain a crystal material.

...

Embodiment 6～10

[0082] In Examples 6-10, the high-temperature binder is composed of 95.7% amorphous material and 4.3% crystalline material, and the raw material mass percentage data of the amorphous material is shown in Table 1, wherein PbX 2 PbO with a mass ratio of 3:1:1 2 , Pb(CH 3 COO) 2 and PbF 2 mixture of M 2 o 3 Sb with a mass ratio of 2:1 2 o 3 and Er 2 o 3 The mixture of NO is the mixture of CaO and ZnO with a mass ratio of 1:1, R 2 O is Li with a mass ratio of 2:1 2 O and Na 2 A mixture of O, the crystal material is a mixed modified product of β-spodumene and aluminum tungstate with a mass ratio of 1:3, and the modifier is diethylene glycol butyl ether acetate with a mass ratio of 1:2:1, Terpineol and butyl carbitol, the preparation method of the high-temperature adhesive of embodiment 6~10 comprises the steps:

[0083] 1), mixing β-spodumene and aluminum tungstate with a mass ratio of 1:3, adding diethylene glycol butyl ether acetate, terpineol and butyl carbitol with ...

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Abstract

The invention relates to a high-temperature binder for a solar battery electrode and a preparation method thereof. The high-temperature binder for the solar battery electrode comprises a crystal material and an amorphous material, the amorphous material is a glass powder prepared from a mixture, and the mixture comprises the following components by the mass percentage: 20-50% of TeO2, 30-60% of PbX2, 1-20% of SiO2, 1-15% of P2O5, 1-25% of M2O3, 1-20% of NO, 0.1-10% of NH4NO3, 0.1-5% of Nb2O5, 0.1-5% of ZnF2, and 0.1-10% of R2O; the crystal material is selected from at least two of the group consisting of modified beta-spodumene, modified beta-cristobalite, modified cordierite, modified aluminum tungstate and modified titanium pyrophosphate. The high-temperature binder has relatively low thermal expansion coefficient.

Description

technical field [0001] The invention relates to a high-temperature adhesive and a preparation method thereof. Background technique [0002] At present and for a long time in the future, crystalline silicon is still the most important material for solar cells, accounting for more than 80% of the market share. More than 30% of the production cost of crystalline silicon batteries comes from silicon materials, and thinning silicon wafers is one of the main means for battery manufacturers to reduce production costs. The thickness of the silicon wafer has changed from the initial 260 μm to 180 μm now, and is developing towards 150 μm or even thinner. Due to the thinning of the silicon wafer, the battery sheet is easily bent during the sintering process, and the bent battery sheet is easily broken in the subsequent process, reducing the yield and increasing the battery production cost. Therefore, reducing the curvature of thin crystalline silicon solar cells has become an urgent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C8/24H01L31/0224
CPCC03C8/24C03C8/245H01L31/022425Y02E10/50
Inventor 陆建鑫黄子怀杜静仪曹秀华
Owner GUANGDONG FENGHUA ADVANCED TECH HLDG
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