Semiconductor Hybrid Bonding With Solder Self-Alignment
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Solution Overview
Problem
The challenge of achieving precise alignment and reliable bonding at extremely small dimensions in semiconductor devices, particularly with hybrid bonding techniques, is exacerbated by the need for advanced manufacturing processes and equipment, leading to higher costs and manufacturing difficulties, especially in high-volume production environments.
Innovation Solution
A method involving the use of self-alignment techniques, such as surface tension-driven alignment and low-temperature annealing, to bond semiconductor devices with metallic or copper bumps, utilizing materials like indium solder and polymer brushes, which allows for precise alignment and bonding without complex external alignment systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hybrid bonding is used to achieve higher interconnect density, then interconnect density is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent employs self-alignment mechanisms where the bonding process automatically corrects misalignment between devices. The solder material and dielectric layers self-adjust during bonding to achieve precise alignment, eliminating the need for complex external alignment systems and reducing manufacturing complexity while maintaining high interconnect density.
Solution Approach 2:
The patent introduces solder material and polymer brush layers as intermediary substances that facilitate the bonding process. These intermediaries enable self-alignment and reduce the complexity of direct dielectric-to-dielectric bonding, allowing high interconnect density to be achieved without proportionally increasing manufacturing complexity.
2Quantity of substance
If pitch is decreased to accommodate higher-density designs, then interconnect density is improved, but alignment precision requirements increase
Solution Approach 1:
The self-alignment mechanism allows the bonding process to automatically correct alignment errors even at reduced pitch dimensions. The solder material and dielectric layers self-adjust during bonding, maintaining alignment precision without requiring proportionally more precise initial positioning, thus enabling higher interconnect density.
Solution Approach 2:
The patent modifies material parameters (using solder material with specific melting points and polymer brushes with controlled viscosity) to enable self-alignment at reduced pitch dimensions. These parameter changes allow the system to maintain alignment precision even as pitch decreases to increase interconnect density.
3Manufacturing precision
If advanced bonding equipment is used to achieve precise alignment, then alignment accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The self-alignment mechanism performs alignment functions automatically during the bonding process itself, eliminating or reducing the need for separate, expensive alignment equipment. The solder material and dielectric layers self-correct alignment errors, achieving high alignment accuracy without proportionally increasing manufacturing cost.
Solution Approach 2:
The patent replaces complex mechanical alignment systems with a self-aligning chemical-physical process involving solder material and polymer brushes. This substitution eliminates the need for expensive external alignment equipment while maintaining high alignment accuracy, reducing manufacturing cost.
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 approach achieves high alignment accuracy and reliability in bonding semiconductor devices, reducing manufacturing complexity and costs while maintaining high interconnect density and electrical connectivity.
Implementation Method 1
self-alignment techniques, such as surface tension-driven alignment
Implementation Method 2
heating the first and second devices to reflow the solder material and join the end surfaces of the plurality of first metallic bumps to the end surfaces of the plurality of second metallic bumps
Implementation Method 3
low-temperature annealing
Data Source
AI summary
A method of bonding semiconductor devices utilizing self-alignment. A pair of device features metallic bumps that protrude through their respective dielectric layers, exposing the end surfaces of the bumps. Solder is applied to these exposed surfaces, and the devices are aligned so that the solder on the first device comes into contact with the solder on the second device. During reflow, surface tension forces of the molten solder self-aligns the devices. After reflow, exposed surfaces of the dielectric layers of the two devices are bonded together.