Bamboo-like Copper Crystal Orientation via DC Electroplating
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Solution Overview
Problem
Current methods for obtaining copper crystal particles with highly preferred orientation, particularly in the field of microelectronics, are inefficient and require complex pulse electrodeposition equipment, limiting production efficiency and control over orientation.
Innovation Solution
A direct current electroplating method using a copper plating solution with specific additives and concentrations, including copper sulfate, sulfuric acid, and quaternary ammonium salts, allows for the deposition of bamboo-like copper crystal particles with controlled preferred orientation, eliminating the need for pulse electrodeposition and reducing equipment complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pulse electrodeposition is used to obtain copper crystal particles with highly preferred orientation, then the orientation control is improved, but the equipment complexity and production efficiency deteriorate
Solution Approach 1:
The invention changes the plating parameters by using direct current with current density of 3-30 A/dm2 and specific plating time, along with optimized copper ion concentration (40-60 g/L) and additive ratios, to achieve highly preferred orientation without requiring complex pulse electrodeposition equipment. This parameter optimization allows standard electroplating equipment to produce the desired crystal orientation.
Solution Approach 2:
The invention replaces expensive and complex pulse electrodeposition equipment with simple, readily available direct current electroplating equipment. By using conventional equipment with optimized parameters, the method eliminates the need for specialized equipment while achieving the same or better orientation control.
2Manufacturing precision
If pulse electrodeposition is used to obtain copper crystal particles with highly preferred orientation, then the orientation control is improved, but the production efficiency deteriorates
Solution Approach 1:
The invention achieves both high production efficiency and preferred orientation control by optimizing the direct current plating parameters, including current density (3-30 A/dm2), plating time, and solution composition. These parameter changes enable faster plating speeds compared to pulse electrodeposition while maintaining excellent orientation control.
3Productivity
If direct current electroplating is used with high current density, then the production efficiency is improved, but the crystal orientation control deteriorates
Solution Approach 1:
The invention resolves this contradiction by optimizing the current density range (3-30 A/dm2) and combining it with specific copper ion concentration (40-60 g/L) and additive formulations. This parameter optimization enables high current density plating while maintaining highly preferred orientation, achieving both high productivity and manufacturing precision.
Solution Approach 2:
The invention uses copper plating additives as intermediaries to mediate between high current density and crystal orientation control. The additives facilitate controlled crystal growth even under high current density conditions, enabling both high production efficiency and preferred orientation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method achieves high-speed copper plating with controlled orientation, improving production efficiency and reducing costs by using standard direct current electroplating equipment and allowing for the optimization of the electroplating process and annealing conditions to achieve anisotropy in the coating layer.
Implementation Method 1
conducting a direct current copper electroplating on the substrate in a copper plating solution
Implementation Method 2
depositing the copper crystal particles on the substrate
Implementation Method 3
allowing for the optimization of the electroplating process and annealing conditions to achieve anisotropy in the coating layer
Data Source
AI summary
An electroplating copper layer includes bamboo-like copper crystal particles having a highly preferred orientation. The bamboo-like copper crystal particles have a long axis direction and a short axis direction, and the bamboo-like copper crystal particles have a length of 20 nm to 5 μm in the long axis direction and a length of 20 nm to 2 μm in the short axis direction. The bamboo-like copper crystal particles have a uniform particle size, and the electroplating copper layer has a major diffraction peak at a 2θ angle of about 44°.