Electrolyte composition

a technology of electrolyte composition and composition, which is applied in the direction of coatings, surface reaction electrolytic coatings, semiconductor devices, etc., can solve the problems of high effort and effort to replace the toxic complexing agent cyanide, and achieve the effect of high deposition rate and high stability

Inactive Publication Date: 2011-03-17
SCHOTT SOLAR AG (DE)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0011]It is the object of the invention to provide an electrolyte composition which combines a high deposition rate with a high stability with respect to foreign ions and fluctuations of the

Problems solved by technology

However cyanide has the disadvantage of being extremely toxic so that its use as a complexing agent is not desired.
Therefore much effort has been made to replace the toxic complexing agent cyanide by other complexing agents.
Known electrolyte compositions free of cyanide have one crucial disadvantage, namely very low deposition rates of only 0.8 to 1 μm per minute.
Not

Method used

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Embodiment Construction

[0034]The following specific embodiments of the present invention do not limit the scope thereof, but are for illustration.

Comparative Composition 1

[0035]An electrolyte composition composed of the following components was tested:

Silver as silver methane sulfonate30 g / LTripotassium citrate monohydrate40 g / LPotassium hydroxide65 g / L5,5-Dimethyl hydantoin130 g / L 

[0036]The pH of the composition was 10.3.

Exemplary Composition 1

[0037]An electrolyte composition composed of the following components was tested:

Silver as silver methane sulfonate30 g / LTripotassium citrate monohydrate40 g / LPotassium hydroxide65 g / L5,5-Dimethyl hydantoin130 g / L Tetrasodium iminodisuccinate10 g / L

[0038]The pH of the composition was 10.3.

Test Procedure:

[0039]The above-mentioned electrolyte according to example 1 of the invention and the electrolyte according to the comparative example were filled into separate beakers, and in each beaker a brass sheet having the dimensions of 10 cm×7 cm was electroplated on one sid...

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Abstract

The electrolyte composition is used in a method of depositing metals, in particular, onto substrates, especially solar cells. The electrolyte composition is particularly suitable for the deposition of metals, in particular silver, onto solar cells. The electrolyte composition is preferably free of cyanides and contains at least one metal, preferably silver, and an iminodisuccinate derivative, preferably a sodium or postassium iminodisuccinate.

Description

CROSS-REFERENCE[0001]The subject matter described and claimed herein below is also described in German Patent Application No. 10 2009 029 558.5, filed on Sep. 17, 2009 in Germany. This German Patent Application provides the basis for a claim of priority of invention for the invention described and claimed herein below under 35 U.S.C. 119 (a)-(d).BACKGROUND OF THE INVENTION[0002]1. The Field of the Invention[0003]The present application relates to an electrolyte composition for the deposition of metals onto substrates. The electrolyte composition at least comprises the metal ions of the metal which should be deposited with this composition.[0004]2. The Description of the Related Art[0005]The galvanic deposition of metals from electrolyte solutions is known in the art. For this purpose the respective metal must be dissolved in the electrolyte solutions to form its ion and to maintain it in this state. For the latter purpose complexing agents are usually used. An important criterion fo...

Claims

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Application Information

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IPC IPC(8): C25D7/12C25D3/02C25D3/10C25D3/12C25D3/20C25D3/38C25D3/46C25D3/54
CPCC25D3/02Y02E10/50H01L31/022425C25D3/46
Inventor LIPPERT, LOTHARDAUWE, STEFAN
Owner SCHOTT SOLAR AG (DE)
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