CVD Dielectric Adhesion Layer for Low-Loss Microelectronic Packaging
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Solution Overview
Problem
Existing microelectronic packaging technologies face challenges in achieving strong adhesion between conductive and dielectric materials without introducing surface roughness, which leads to high frequency impedance losses and requires harsh wet chemicals.
Innovation Solution
The use of chemical vapor deposition (CVD) dielectric materials to form smooth interfaces between conductive and dielectric materials, eliminating the need for surface roughening and providing covalent bonds for enhanced adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surface roughening is applied to enhance adhesion between conductive and dielectric materials, then adhesion strength is improved, but surface roughness increases causing high frequency impedance losses
Solution Approach 1:
A separate adhesion layer is introduced as an intermediary between the conductive material and the dielectric material. This adhesion layer specifically bonds to the copper surface while providing a smooth interface for the dielectric, thus achieving strong adhesion without surface roughness that would cause impedance losses.
Solution Approach 2:
The interface between conductive and dielectric materials is segmented into two distinct layers: an adhesion layer that bonds to the conductor, and a smooth dielectric interface layer. This segmentation allows each layer to perform its specific function - the adhesion layer provides bonding strength while the smooth interface maintains signal integrity.
2Strength
If surface roughening is applied to enhance adhesion, then adhesion strength is improved, but harsh wet chemicals are required for the process
Solution Approach 1:
The mechanical/chemical roughening process is replaced by a controlled deposition process of an adhesion layer. Instead of using harsh wet chemicals to create roughness, a thin adhesion layer is deposited through a more controlled process that achieves bonding without requiring aggressive chemical treatments.
3Strength
If surface roughness is increased to improve adhesion, then adhesion strength is improved, but manufacturing precision is reduced
Solution Approach 1:
The solution moves from modifying the surface topology (roughness in one dimension) to adding a functional layer (adhesion layer as a new dimension). Instead of roughening the existing surfaces, a thin adhesion layer is deposited that provides bonding functionality while maintaining the smoothness of the original surfaces.
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 significantly reduces impedance losses and improves the reliability of microelectronic package structures by ensuring strong adhesion between conductive and dielectric materials, while avoiding the use of harsh chemicals and maintaining smooth surfaces.
Implementation Method 1
forming a chemical vapor deposition (CVD) dielectric material on a package dielectric material
Implementation Method 2
providing covalent bonds for enhanced adhesion
Data Source
AI summary
Methods of forming a microelectronic packaging structure and associated structures formed thereby are described. Those methods may include forming a CVD dielectric material on a package dielectric material, and then forming a conductive material on the CVD dielectric material.