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Electro-conductive paste comprising silver particles with silver oxide and organic additive

A technology of organic additives, silver particles, applied in conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve problems such as reduced efficiency and battery damage

Inactive Publication Date: 2016-07-20
HERAEUS PRECIOUS METALS GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

N-type solar cells have the potential to improve cell performance relative to similar p-type cells, but still have the disadvantage of reduced efficiency due to damage to the cell during firing

Method used

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  • Electro-conductive paste comprising silver particles with silver oxide and organic additive
  • Electro-conductive paste comprising silver particles with silver oxide and organic additive
  • Electro-conductive paste comprising silver particles with silver oxide and organic additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0214] Example 1 - Preparation of paste for solar cells

[0215] Appropriate amounts of silver particles with AgO content (0.07% by weight O content), lauric acid and stearic acid were mixed in a Kenwood Major Titanium mixer to coat the silver particles with fatty acid. Grind an appropriate amount of organic vehicle (Table 1), to a d of 2 µm 50 The glass frit, zinc oxide (Sigma Aldrich GmbH, product number 204951) and ethyl cellulose (DOWEthocel4, 48.7% hydroxyethoxylated) were added to the mixer and mixed. The paste was passed through a 3-roll mill Exact 80E with stainless steel rollers several times until homogeneous, with a first gap of 120 μm and a second gap of 60 μm, with the gap gradually reduced to a first gap of 20 μm and a second gap of 10 μm. Viscosity was measured as described above and an appropriate amount of organic vehicle having the composition given in Table 1 was added to adjust the paste viscosity to a target of about 16 to about 20 Pas. The weight % of t...

Embodiment 2

[0220] Example 2 - Solar Cell Preparation and Efficiency, Fill Factor, Open Circuit Voltage, Contact Resistance and Series Resistance Measurements

[0221] The paste was applied on a single-crystal Cz-n-type silicon wafer with a boron-doped front side and a phosphorus-doped back side. Wafer has 156×156mm 2 size and pseudo-square shape. The wafer has SiN with a thickness of about 75 nm on both sides x Anti-reflection / passivation layer. The solar cells used were structured by alkaline etching. The example pastes were screen printed on the p-doped side of the wafer using a semi-automatic screen printer X1SL from AsysGroup, EKRA Automatisierungssysteme with the following screen parameters: 290 mesh, 20 μm wire thickness, 18 μm screen Emulsion, 72 gridlines, 60μm gridline opening, 3 busbars, 1.5mm busbar width. A commercially available Ag paste SOL9600A, available from Heraeus Precious Metals GmbH & Co. KG, was printed on the back n-doped side of the device using the same prin...

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Abstract

In general, the invention relates to electro-conductive pastes comprising silver particles which comprise silver oxide and organic additives and their use in the preparation of photovoltaic solar cells, preferably n-type photovoltaic solar cells. More specifically, the invention relates to electro-conductive pastes, solar cell precursors, processes for preparation of solar cells, solar cells and solar modules. The invention relates to an electro-conductive paste comprising as paste constituents: a. Silver particles; wherein the silver particles comprise the following silver particle constituents: i. silver metal; ii. silver oxide; b. an inorganic reaction system; c. an organic vehicle; d. an organic additive comprising one or more oxygen atoms doubly bonded to a carbon atom, or singly bonded to two carbon atoms, or a combination of both types of oxygen atom.

Description

field of invention [0001] In general, the present invention relates to a conductive paste comprising silver particles comprising silver oxide and organic additives and its use in the preparation of photovoltaic solar cells, eg n-type or p-type photovoltaic solar cells. More specifically, the present invention relates to a conductive paste, a solar cell precursor, a method of making a solar cell, a solar cell, and a solar cell module. Background of the invention [0002] A solar cell is a device that converts light energy into electricity using the photovoltaic effect. Solar energy is an attractive green energy source because it is sustainable and produces only non-polluting by-products. Accordingly, a great deal of research is currently being devoted to developing solar cells with increased efficiency while continuing to reduce material and production costs. When light hits a solar cell, a portion of the incident light is reflected by the surface and the remainder is trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425H01L31/068Y02E10/547H01L31/05H01L31/18
Inventor M·沙费尔W·施密特C·穆舍勒科诺兹M·孔茨
Owner HERAEUS PRECIOUS METALS GMBH & CO KG