Conductive Polymer Hybrid Bonding for Adhesive-Free Interconnects
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Solution Overview
Problem
Existing semiconductor and optoelectronic device bonding technologies rely on adhesives, which can introduce defects and limitations in thermal expansion mismatch, and there is a need for adhesive-free direct bonding techniques that maintain electrical and optical integrity.
Innovation Solution
Hybrid bonding methods using electrically conductive polymers and dielectric materials to directly bond conductive and non-conductive features without adhesives, enabling covalent bonds and fine pitch connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesives are used for bonding semiconductor substrates, then bonding strength is improved, but thermal expansion mismatch and defects are introduced
Solution Approach 1:
The patent removes adhesives from the bonding process entirely, extracting the problematic element that causes thermal expansion mismatch and defects. Direct substrate-to-substrate bonding is achieved through surface preparation and bonding processes that eliminate the need for adhesive materials.
Solution Approach 2:
The patent introduces an intermediary bonding process that facilitates direct bonding between substrates. This includes surface activation, plasma treatment, or chemical bonding mechanisms that enable strong adhesion without requiring traditional adhesive materials, thus avoiding thermal expansion issues.
2Strength
If adhesives are used for bonding, then mechanical connection is achieved, but optical integrity and electrical performance are degraded
Solution Approach 1:
Adhesives are completely removed from the bonding interface, eliminating their negative impact on optical transparency and electrical performance. The bonding is achieved through direct substrate interaction, ensuring that no foreign material interferes with optical or electrical pathways.
3Reliability
If direct bonding without adhesives is used, then optical transparency and electrical performance are improved, but bonding strength may be insufficient
Solution Approach 1:
The patent modifies surface parameters through plasma treatment, chemical etching, or surface activation to enhance bonding capability. These parameter changes create surface conditions that enable strong direct bonding without adhesives, maintaining both optical integrity and mechanical strength.
Solution Approach 2:
The bonding interface incorporates multiple functional layers or treatments that combine mechanical bonding, chemical bonding, and physical adhesion mechanisms. This composite approach ensures strong bonding while maintaining optical and electrical performance through carefully engineered interface structures.
4Ease of manufacture
If conventional bonding with adhesives is used, then process simplicity is maintained, but manufacturing precision and defect reduction are limited
Solution Approach 1:
Surface preparation steps are performed in advance to create optimal bonding conditions. This includes pre-cleaning, surface activation, and alignment procedures that ensure high-precision bonding. By preparing surfaces beforehand, the actual bonding process becomes simpler while achieving superior precision.
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
Achieves strong, adhesive-free bonds with reduced thermal stress and improved optical transparency, allowing for high-density interconnects and efficient electrical connections in semiconductor and optoelectronic devices.
Implementation Method 1
Hybrid bonding methods using electrically conductive polymers and dielectric materials to directly bond conductive and non-conductive features without adhesives, enabling covalent bonds
Implementation Method 2
Achieves strong, adhesive-free bonds with reduced thermal stress
Data Source
AI summary
A structure includes a first substrate, a second substrate, and an interface region. The first substrate includes a first layer having at least one electrically conductive first portion and at least one electrically insulative second portion. The second substrate includes a second layer having at least one electrically conductive third portion and at least one electrically insulative fourth portion. The interface region is between the first layer and the second layer and includes at least one electrically conductive polymer material.