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Alloy aluminum paste for back surface of PERC solar cell

A solar cell and alloy aluminum technology, applied in the field of alloy aluminum paste, can solve the problems of low gap filling rate and irregularity, and achieve the effect of complete and uniform BSF layer, reduced aluminum beads, and reasonable formula

Active Publication Date: 2019-09-27
NANTONG T SUN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Taiwan patent TW201827530A provides a paste composition for solar cells. The present invention provides a paste composition. Specifically, the paste composition for solar cells includes glass powder, an organic carrier and a conductive material. It is characterized in that (1) the conductive material is more than 40% by mass of Al-X alloy powder with a melting point between 660 and 800°C; (2) the element X of the Al-X alloy powder is selected from At least one of silicon, barium, bismuth, calcium, germanium, indium, lanthanum, nickel, lead, antimony, strontium, tellurium and yttrium, the alloy paste prepared by applying this technology accounts for the total area of ​​the passivation film opening in the solar cell area The gap filling rate in 0.5~1% of PERC solar cells is not high, and the formed BSF layer is irregular

Method used

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  • Alloy aluminum paste for back surface of PERC solar cell
  • Alloy aluminum paste for back surface of PERC solar cell
  • Alloy aluminum paste for back surface of PERC solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of lead-free glass powder

[0032] The preparation of glass powder A: take the weight of glass powder A as 100%, prepare 20% ZnO, 20% B 2 o 3 , 35% Sb 2 o 3 , 5% BaCl 2 , 10%Na 2 CO 3 and 10% Rb 2 o 2 , this example uses BaCl 2Metal compounds of other halogen group elements are also applicable by adjusting the addition ratio, and then utilize known mixers such as a disperser or a three-roller to mix each material evenly, then carry out drying treatment for 3.5h, and then transfer the dried treatment raw materials to In the crucible, put the crucible containing the raw materials into the heating chamber, first raise the temperature to 950 ° C, and then keep it warm for 1.5 hours, then pass the smelted material liquid through cooling rollers to obtain glass frit, and then crush and sieve the glass frit The median particle size D 50 The glass frit A is 1.36 μm and the softening temperature is 544.7°C.

[0033] Preparation of glass frit B: take the...

Embodiment 2

[0039] 1. Preparation of lead-free glass powder

[0040] The preparation of glass powder A: take the weight of glass powder A as 100%, prepare 40% ZnO, 5% B 2 o 3 , 30% Sb 2 o 3 , 5% SrCl, 10% Cs 2 CO 3 And 10% BaO, what this embodiment adopts is that the metal compound of SrCl and other halogen group elements is also applicable by adjusting the addition ratio, then utilize known mixers such as disperser or three-roller to mix each material evenly, then carry out Drying treatment for 3 hours, then transfer the dried raw materials into the crucible, then place the crucible containing the raw materials in the heating chamber, first raise the temperature to 850 °C, then keep it warm for 2 hours, and then pass the smelted material liquid through cooling rollers to obtain Glass frit, then the glass frit is crushed and sieved to obtain the median particle size D 50 The glass frit A is 1.89 μm and the softening temperature is 570°C.

[0041] Preparation of glass frit B: take t...

Embodiment 3

[0048] 1. Preparation of lead-free glass powder

[0049] The preparation of glass powder A: take the weight of glass powder A as 100%, prepare 10% ZnO, 30% B 2 o 3 , 30% Sb 2 o 3 , 10% CaCl 2 , 10%K 2 CO 3 and 10% Cs 2 O, what this embodiment adopts is CaCl 2 Metal compounds of other halogen elements are also applicable by adjusting the addition ratio, and then use a known mixer such as a disperser or a three-roller to mix the various materials evenly, then dry them for 4 hours, and then transfer the dried raw materials to the crucible In the heating chamber, put the crucible containing the raw materials into the heating chamber and raise the temperature to 1050°C, then keep it warm for 2 hours, then pass the smelted material liquid through cooling rollers to obtain glass frit, and then crush and sieve the glass frit to obtain Median particle size D 50 The glass frit A is 2.17μm and the softening temperature is 530.6°C.

[0050] Preparation of glass frit B: take the ...

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Abstract

The invention discloses an alloy aluminum paste for the back surface of a PERC solar cell. With the weight of the alloy aluminum paste to be 100%, an alloy silver paste is prepared by the following components: by weight percentage, 35 to 56.5% of aluminum-silicon alloy powder, 17.5 to 37.5% of aluminum powder, 1 to 2% of lead-free glass powder, 15 to 20% of organic solvent, 3 to 5% of ethyl cellulose, 0.05 to 0.1% of thixotropic agent and 0.5 to 1.5% of dispersant. The alloy paste is applied to a PERC solar cell with the total area of a passivation film opening occupying 0.5 to 1% of the solar cell area. The alloy aluminum paste is used for a low-aperture ratio PERC solar cell, particularly, a back electrode with the total area of the passivation film opening occupying 0.5 to 1% of the solar cell area, the void filling rate is good, the formed BSF layer is complete and uniform, aluminum beads are reduced and the boiling performance and the adhesion are good.

Description

technical field [0001] The invention relates to an aluminum paste on the back of a solar cell, in particular to an alloy aluminum paste used on the back of a PERC solar cell. Background technique [0002] PERC technology, Passivated Emitter Back Contact, improves conversion efficiency by forming a passivation layer on the back of the solar cell. PERC cells have the advantages of simple process, low cost, and high compatibility with existing cell production lines, and are expected to become the mainstream direction of high-efficiency solar cells in the future. [0003] PERC technology increases conversion efficiency by adding a dielectric passivation layer on the back of the cell. Higher efficiency levels in standard cell configurations are limited by the tendency for photogenerated electrons to recombine. PERC cells maximize the potential gradient across the P-N junction, which enables a more stable flow of electrons, less electron recombination, and higher efficiency leve...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01L31/0216H01L31/0224
CPCH01B1/22H01L31/02167H01L31/022425Y02E10/50B22F1/107B22F1/05C22C1/05B22F2301/052B22F2304/10
Inventor 朱鹏杨贵忠陈鑫剑徐海波王叶青
Owner NANTONG T SUN NEW ENERGY CO LTD
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