Nanotwinned Copper Electroplating Orientation Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The fabrication of nanotwinned Cu through electroplating is expensive and inefficient, and conventional methods often result in irregular structures with a highly (111) preferred orientation, making it difficult to implement in the electronic industry.
Innovation Solution
A nanotwinned structure is developed where less than 50% of the surface takes the (111) plane as the preferred orientation, allowing for the deposition of nanotwins with a face-centered cubic structure along the [111] crystallographic axis, using materials like copper, gold, and palladium, and can be formed using direct current electroplating, enabling applications in electronic devices with improved mechanical strength and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pulse electroplating method is used to fabricate nanotwinned Cu, then nanotwinned structure with high mechanical strength is achieved, but fabrication cost increases and electroplating efficiency decreases
Solution Approach 1:
The patent employs pulse electroplating with specific parameters (pulse width 1-100ms, duty cycle 10-90%) to create periodic deposition cycles that promote nanotwin formation. The periodic on-off cycling allows controlled nucleation and growth of nanotwins while maintaining high deposition rates, resolving the contradiction between achieving nanotwinned structure and maintaining electroplating efficiency
2Ease of manufacture
If conventional DC electroplating with cathode rotation is used, then fabrication cost is reduced, but only nanotwinned structures with highly (111) preferred orientation can be manufactured
Solution Approach 1:
The patent changes the electroplating mode from continuous DC to pulsed DC, and adjusts key parameters including pulse width (1-100ms), duty cycle (10-90%), and current density. These parameter changes enable control over crystallographic orientation, allowing production of nanotwinned structures with various orientations including non-(111) preferred orientations, thus maintaining low cost while improving structural versatility
3Strength
If nanotwinned Cu with highly (111) preferred orientation is produced, then specific mechanical properties are achieved, but application flexibility in electronic industry is limited
Solution Approach 1:
The patent introduces asymmetry in crystallographic orientation by producing nanotwinned structures with non-(111) preferred orientations through controlled pulse electroplating. This breaks the symmetry constraint of conventional methods, enabling tailored orientation structures that can be optimized for different application requirements such as stress resistance, ductility, or electrical conductivity, thereby improving application flexibility
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
The nanotwinned structure achieves electromigration resistance and high mechanical strength, facilitating its use in electronic components such as interconnect structures and heat dissipation devices while reducing fabrication costs and improving efficiency.
Implementation Method 1
The invention provides a nanotwinned structure deposited on a surface of a substrate... The fabrication of nanotwinned Cu through electroplating generally requires a pulse electroplating method
Data Source
AI summary
A nanotwinned structure deposited on a surface of a substrate is provided. The nanotwinned structure includes at least one domain, and the domain includes a plurality of nanotwins. Each of the nanotwins possesses a faced-centered cubic (FCC) structure. The plurality of nanotwins are stacked along the [111] crystallographic axis. Less than 50% of a surface of the nanotwinned structure takes the (111) as the preferred orientation.