High efficiency local back electrode aluminum paste for crystalline silicon solar cells and its application in perc cells

a solar cell and local back electrode technology, applied in the field of solar cells, can solve the problems of current leakage increase and high cost, and achieve the effects of good ohmic contact, high efficiency and good printing workability

Active Publication Date: 2019-01-03
NANTONG T SUN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology provides an improved method for applying aluminium pastes on semiconductor devices such as crystal-silicon cells or thin films made from materials like gallium arsenide (GaAs). These techniques help improve their performance by reducing electrical resistance between different layers within the device while maintaining excellent conductivity properties through the use of special compositions that can be easily printed onto these surfaces without damaging them during manufacturing processes.

Problems solved by technology

This patented technical problem addressed in this patents describes how to efficiently produce thin films made through low temperature polycrystallization techniques called LPT (Liquit Thin Film) without compromising electrical properties such as conductivity and open circuit voltage. Current methods require expensive materials like silver powder and tin lead to decrease product yield due to impurities contained within these layers. Additionally, existing processes use solvent extraction followed by dry cleaning steps leading to increased manufacturing costs. Therefore, there remains a challenge to create a solution involving less expensive starting materials while achieving superior back surface coverage and reduced reflectance.

Method used

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Examples

Experimental program
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Effect test

example 2

Practical Example 2

[0027]A kind of high efficiency local back electrode aluminum paste for crystalline silicon solar cell, the said high efficiency local back electrode aluminum paste for crystalline silicon solar cell is composed of the following components proportioned to weights: 85 parts for powder, 30 parts for organic carrier, 10 parts for inorganic binder, and 1 part for the auxiliary conductive additive.

[0028]11 um∘ The said aluminum powder shall comprise at least one or more kinds of alloy powders, the said alloy powder shall be one or more of the following: aluminum and zinc alloy powder, aluminum and magnesium alloy powder, aluminum and silicone alloy power, silver and aluminum alloy powder. The added alloy powder of the above is 30% the content of the aluminum powder, and the aluminum particle size is 11 um.

[0029]The said organic carrier shall be composed of macromolecules polymer and organic solvent mixed together, the said macromolecules polymer is proportioned as 30%, an

example 3

Practical Example 3

[0033]A kind of high efficiency back electrode local aluminum paste for crystalline silicon solar cell, and the said high efficiency back electrode aluminum paste for crystalline silicon solar cell is composed of the following components proportioned to weights: 78 parts for aluminum powder, 22 parts for organic carrier, 6 parts for inorganic binder, 0.4 part for auxiliary conductive additive.

[0034]The said aluminum powder shall comprise at least one or more kinds of alloy powders, the said alloy powder shall be one or more of the following: aluminum and zinc alloy powder, aluminum and magnesium alloy powder, aluminum and silicon alloy power, silver and aluminum alloy powder. The added alloy powder of the above shall be 13% the content of the aluminum powder, and the aluminum particle size shall be 6 um.

[0035]The said organic carrier shall be composed of macromolecules polymer and organic solvent mixed together, the said macromolecules polymer is proportioned as 21%,

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Abstract

A high-efficiency back electrode local aluminum paste crystalline silicon solar cell is composed of the following components proportioned to weights: 70-85 of parts powder, 1-30 parts of organic carrier, 0.1-10 parts of inorganic binder, 0.1-1 parts of auxiliary conductive additives. The aluminum paste is mainly used to manufacture the passivated emitter and back electrode of silicon solar cell with dot or linear contact on rear surface. PERC aluminum paste printed on the passivated film of the silicon wafer with dot-opening or linear-opening is dried and sintered.

Description

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Claims

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Application Information

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Owner NANTONG T SUN NEW ENERGY CO LTD
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