Novel lead-free sliver slurry for high-efficiency crystalline silicon solar battery as well as preparation and application thereof

A technology of solar cells and crystalline silicon, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve the problems of high cost, difficulty in realizing high-efficiency batteries and low cost, and improve conversion efficiency , Simplify the process and reduce the manufacturing cost

Active Publication Date: 2013-03-06
SHANGHAI BONA ELECTRONICS TECH
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Problems solved by technology

However, the cost of this process is high, and it is difficult t...
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Abstract

The invention relates to novel lead-free sliver slurry for a high-efficiency crystalline silicon solar battery as well as preparation and application thereof. The novel lead-free sliver slurry for the high-efficiency crystalline silicon solar battery comprises 0.5-5wt% of lead-free glass powder with the chemical composition of aTeO2-b(Bi2O3, Sb2O3)-cMO, 60-90wt% of conductive silver powder, and 9.5-35wt% of organic carrier phase. The invention further provides the preparation process and the application of the novel lead-free sliver slurry for the high-efficiency crystalline silicon solar battery. The lead-free sliver slurry disclosed by the invention is cofired according to a one-step method silk-screen printing process to be prepared into an electrode with a low contact resistance. A process of slightly doping the crystalline silicon solar battery is simplified, the conversion efficiency of the battery is improved and the manufacturing cost of the battery is reduced.

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  • Novel lead-free sliver slurry for high-efficiency crystalline silicon solar battery as well as preparation and application thereof
  • Novel lead-free sliver slurry for high-efficiency crystalline silicon solar battery as well as preparation and application thereof
  • Novel lead-free sliver slurry for high-efficiency crystalline silicon solar battery as well as preparation and application thereof

Examples

  • Experimental program(1)
  • Comparison scheme(1)

Example Embodiment

[0052] Example 1-6
[0053] Raw materials: select raw materials according to Table 1. Examples 1-6 are respectively added with TeO with different compositions and particle sizes listed in Table 1 2 -Bi 2 O 3 -Sb 2 O 3 -MO (M=Zn, Mg, Ba, Ca) glass powder
[0054] aTeO 2 -b(Bi 2 O 3 ,Sb 2 O 3 )-cMO glass preparation method:
[0055] First, mix and grind the raw materials in accordance with Table 1 thoroughly, then add the mixed raw materials into the corundum crucible, heat and melt at 900~1300℃ for 1-5h, then ball mill after water quenching, and grind to a particle size of 0.5-10μ. , Dry to obtain the required glass powder.
[0056] Slurry preparation method:
[0057] Weigh the conductive silver powder and lead-free glass powder according to the proportion in Table 1, mix them thoroughly to obtain the mixed powder, put the mixed powder in the organic carrier phase according to the proportion, stir and pre-disperse, and roll it in a three-roller until the scraper fineness is less than 14 μm to obtain the lead-free conductive silver paste.
[0058] Table 1 Example 1-6 slurry composition table
[0059]
[0060]
[0061] *A1-A6 represent Example 1-Example 6 respectively
[0062] *Silver content/wt%: guide the weight percentage of silver powder in the paste
[0063] *Glass powder content/wt%: refers to the weight percentage of glass powder in the slurry
[0064] *Organic vehicle phase/wt%: refers to the weight percentage of the organic vehicle phase in the slurry
[0065] *Glass powder composition/mol%: refers to the molar percentage of each raw material based on the total moles of glass powder raw materials
[0066] *Organic carrier phase composition/wt%: refers to the weight percentage of each raw material based on the total weight of the organic carrier phase
[0067] *The solvents used in A1-A6 are:
[0068] A1 uses terpineol, A2 uses butyl carbitol, A3 uses butyl carbitol acetate, A4 uses turpentine and terpineol with a weight ratio of 2:3, and A5 uses butyl with a weight ratio of 3:4 Carbitol and butyl carbitol acetate, A6 uses butyl carbitol, butyl carbitol acetate and tributyl citrate in a weight ratio of 1:2:4.
[0069] *The thickener used in A1, 2, 3 is ethyl cellulose, and the thickener used in A4, 5, 6 is butyl cellulose
[0070] *The surfactant used in A1 and 2 is caprylic acid, the surfactant used in A3 and 4 is lecithin, and the surfactant used in A5 and 6 is Span 85
[0071] Performance testing:
[0072] TeO 2 -Bi 2 O 3 -Sb 2 O 3 -MO (M=Zn, Mg, Ba, Ca) glass powder performance test:
[0073] Numbering
[0074] Preparation of solar cells: A1-A6 is used as raw materials to prepare pastes A1-A6, which are screen-printed on a single crystal (40mm×40mm, square resistance of about 100Ω/sq), SiNx anti-reflection film is vapor-deposited on the front and printed on the back (Silver back electrode and aluminum back field) on a silicon wafer, sintered in an infrared sintering furnace to make solar cells, and test the electrical performance.
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PUM

PropertyMeasurementUnit
Particle size0.2 ~ 10.0µm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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