Lead-free glass powder for preparing solar cell silver paste and application of lead-free glass powder

A technology of solar cells and lead-free glass powder, applied in the field of solar cell materials, can solve problems such as environmental pollution threats, achieve low softening point, and improve photoelectric conversion efficiency

Inactive Publication Date: 2019-07-16
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the glass powder is lead-based or glass powder containing lead, which poses a great threat to environmental pollution.

Method used

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  • Lead-free glass powder for preparing solar cell silver paste and application of lead-free glass powder
  • Lead-free glass powder for preparing solar cell silver paste and application of lead-free glass powder
  • Lead-free glass powder for preparing solar cell silver paste and application of lead-free glass powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In this example, different precious metal elements, lead-free metal oxides and non-metal oxides are used to prepare lead-free glass powder; in addition, as a comparison, this example also designs conventional lead-containing glass powder as a comparative test; the glass powder formula is shown in the table 1; Among them, the 1~32# test is the lead-free glass powder of this example, and the 33# test is the lead-containing glass powder for comparison.

[0041] Table 1 glass powder formula (weight percent %)

[0042]

[0043]

[0044] "Precious metal element" in Table 1 refers to the weight percentage of the corresponding precious metal elemental substance, for example, "Ru10" means that the metal Ru is used in an amount of 10 wt%; the rest of the components are also in weight percentage.

[0045] Weigh each raw material according to the weight percentage in Table 1, mix it to make 100g of the mixture, mix it evenly, put it into an alumina crucible, cover it, put the...

Embodiment 2

[0053] In this example, the lead-free glass frit of test 6# in Table 1 of Example 1 was used for the test to prepare solar battery silver paste, and the dosage ratio of silver powder, organic phase and glass frit was analyzed. The solar cell silver paste formula is shown in Table 3.

[0054] The silver paste formula (% by weight %) of different proportions of solar cell

[0055] test silver powder The organic phase glass powder 1 70％ 15％ 15％ 2 80％ 10％ 10％ 3 90％ 5％ 5％ 4 90％ 8％ 2％ 5 90％ 9.5％ 0.5％

[0056] Each component was weighed according to the weight ratio in Table 3, and the total weight was 100 g. After mixing, it was ground with a three-roll mill to make the solar cell silver paste of this example.

[0057] The prepared solar cell silver paste is screen-printed into a solar cell, and then sintered in a special solar cell sintering furnace. The sintering conditions are as follows: image 3 As shown, and then use the...

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Abstract

The invention discloses lead-free glass powder for preparing solar cell silver paste and application of the lead-free glass powder. The lead-free glass powder does not contain lead and comprises 10-70wt% of precious metal, 0-60wt% of lead-free metal oxide and 5-65wt% of non-metal oxide. The lead-free glass powder and the solar cell silver paste do not contain the lead and are safe and environmental-friendly; moreover, the lead-free glass powder is low in softening point, low-temperature sintering can be achieved when the lead-free glass powder is used as the solar cell silver paste, the lead-free glass powder effectively reacts with a silicon nitride anti-reflection layer, a large amount of silver particles are reduced at a silver silicon interface, favorable ohmic contact is formed, electrons in N-type silicon are more easily collected by a silver grid line, so that the photoelectric conversion efficiency of the cell is improved. The glass powder and the solar cell silver paste lay afoundation for preparation the solar cell with low energy consumption, environmental friendliness and the safety.

Description

technical field [0001] The present application relates to the field of solar cell materials, in particular to a lead-free glass powder for preparing solar cell silver paste and its application. Background technique [0002] As a green and environmentally friendly new energy conversion device, solar cells play an important role in energy conversion in current life, and can effectively convert sunlight into electrical energy. The electrodes of the solar cell include front electrodes and back electrodes. During the preparation of batteries, their corresponding electronic pastes are usually printed on both sides of the battery by printing, and then the preparation of the electrodes is completed by sintering. The paste used to prepare the front electrode is mainly silver paste. Solar cell silver paste is mainly composed of silver powder, glass powder and organic phase. The main function of glass powder in electrode preparation is to etch off the silicon nitride anti-reflection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224H01L31/04
CPCH01B1/16H01B1/22H01B13/00H01L31/022425H01L31/04Y02E10/50
Inventor 潘锋袁升陈勇吉刘建林原林海
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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