Multi-Layer Adhesion Films for Low-Loss Microelectronic Packaging
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Solution Overview
Problem
In microelectronic packages, there is a conflict between maintaining smooth conductive structures to minimize signal loss and achieving good adhesion with dielectric materials, as surface roughness affects signal integrity, particularly at high frequencies, and existing methods often require roughening the conductive surfaces for adhesion.
Innovation Solution
The use of multi-layered adhesion promotion films with distinct dielectric materials, such as nitride and oxide layers, that provide strong adhesion to unroughened conductive structures without increasing dielectric mismatch, allowing for better matching of dielectric constants with surrounding materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the conductive structure surface is roughened to improve adhesion with dielectric materials, then adhesion strength is improved, but surface roughness increases causing higher signal loss at high frequencies
Solution Approach 1:
The adhesion promotion function is segmented into multiple thin dielectric layers with different dielectric constants. The first layer (higher dielectric constant) provides adhesion to the conductive structure, while the second layer (lower dielectric constant) reduces dielectric mismatch with surrounding materials. This segmentation allows adhesion without requiring surface roughness, thereby reducing signal loss.
Solution Approach 2:
The invention uses composite dielectric structures consisting of multiple layers with different dielectric constants. This composite approach enables the system to achieve both adhesion promotion (through the first layer) and dielectric matching (through the second layer) without roughening the conductive surface, thus resolving the contradiction between adhesion strength and signal loss.
2Device complexity
If a single-layer dielectric material is used for adhesion promotion, then device complexity is reduced, but dielectric constant matching with surrounding materials deteriorates
Solution Approach 1:
The dielectric structure is segmented into multiple layers, each with optimized dielectric constants. The first layer has a higher dielectric constant for adhesion, while the second layer has a lower dielectric constant for matching with surrounding materials. This segmentation improves dielectric constant matching without significantly increasing device complexity, as the layers can be deposited using standard fabrication processes.
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 reduces signal loss by maintaining low surface roughness of conductive structures while enhancing adhesion, thereby improving the integrity of high-frequency signals and reducing impedance mismatch in microelectronic packages.
Implementation Method 1
the conductive structure is surrounded by a multi-layered adhesion promotion film
Implementation Method 2
The first dielectric constant is greater than the third dielectric constant, and the second dielectric constant is less than the third dielectric constant
Data Source
AI summary
Structures are described that include multi-layered adhesion promotion films over a conductive structure in a microelectronic package. The multi-layered aspect provides adhesion to surrounding dielectric material without a roughened surface of the conductive structure. Furthermore, the multi-layered aspect allows for materials with different dielectric constants to be used, the average of which can provide a closer match to the dielectric constant of the surrounding dielectric material. According to an embodiment, a first dielectric layer that includes at least one nitride material can provide good adhesion with the underlying conductive structure, while one or more subsequent dielectric layers that include at least one oxide material can provide different dielectric constant values (e.g., typically lower) compared to the first dielectric layer to bring the overall dielectric constant closer to that of a surrounding dielectric material. The first and second layers may be discrete layers or a single continuous layer with grading.