Embedded Inductor Barrier Layers for Plating Chemistry Stability

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Solution Overview

Problem

The integration of magnetic materials like iron, nickel, and rare-earth metals into electronic substrates is hindered by their incompatibility with traditional plating chemistries, leading to leaching issues that affect the quality and stability of these chemistries, which is detrimental to the performance and lifespan of inductors in integrated circuit devices.

Innovation Solution

Incorporating a barrier layer, such as titanium, polymeric, or nitride materials, to prevent magnetic materials from leaching into plating solutions during the fabrication process, while using a plating seed layer and conductive fill material to form inductors within the electronic substrate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If magnetic materials (iron, nickel, cobalt, rare-earth metals) are used to form inductors in electronic substrates, then the performance and speed of integrated circuit devices are improved, but the magnetic materials leach into plating chemistries, causing detrimental impacts on quality, process stability, and useful life of the plating chemistries

Engineering Contradiction:

Improveperformance of embedded inductorsVSAvoidleaching of magnetic material into plating chemistries

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

A barrier layer is introduced as an intermediary between the magnetic material and the plating chemistry. This barrier layer prevents direct contact and leaching of magnetic materials into the plating solutions, while still allowing the plating process to proceed effectively on the outer surface of the structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The inductor structure is segmented into multiple layers: an inner magnetic material layer for inductive functionality and an outer barrier layer for chemical protection. This segmentation allows each layer to perform its specific function without interfering with the other.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If traditional plating chemistries are used in the fabrication process, then the manufacturing process is simple and cost-effective, but magnetic materials are incompatible with these chemistries, leading to leaching issues that affect quality and stability

Engineering Contradiction:

Improvesimplicity of plating processVSAvoidstability of plating chemistry

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The barrier layer serves as a mediator that allows traditional plating chemistries to be used without direct exposure to magnetic materials. This maintains the simplicity and cost-effectiveness of traditional plating processes while protecting the chemistry from contamination and degradation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Volume of moving object

If magnetic materials are embedded directly in the substrate without protection, then the device size is minimized and integration is maximized, but the magnetic materials contaminate the plating solutions, reducing the useful life of the chemistries

Engineering Contradiction:

Improvesize of inductorVSAvoiduseful life of plating chemistry

Core Design Contradiction:

Volume of moving objectVSDuration of action of stationary object

Solution Approach 1:

The inductor is segmented into a compact magnetic core and a thin protective barrier layer. This segmentation minimizes the overall volume while providing necessary protection, allowing the magnetic material to be densely packed without excessive spacing for protection.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A thin film barrier layer is applied over the magnetic material. This thin film provides adequate protection against leaching while minimizing the increase in overall device volume, thus maintaining compactness while extending chemistry life.

Inventive Principle:

Principle #30Flexible shells and thin films

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 barrier layer effectively prevents magnetic material leaching, maintaining the integrity of plating chemistries and enhancing the performance and reliability of embedded inductors in integrated circuit devices.

Implementation Method 1

a barrier layer on the magnetic material layer, wherein the barrier layer prevents the magnetic material layer from leaching into the plating solutions

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Implementation Method 2

inductors are passive electrical components that store energy in a magnetic field generated by a magnetic material

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS12573536B2Electronic substrates having embedded inductors

Publication Date: 2026.03.10 INTEL CORP

AI summary

An electronic substrate may be fabricated by forming a base substrate and forming an inductor extending through the base substrate, wherein the inductor includes a magnetic material layer and a barrier layer, such that the barrier layer prevents the magnetic material layer from leaching into plating solutions during the fabrication of the electronic substrate. In one embodiment, the barrier material may comprise titanium. In another embodiment, the barrier layer may comprise a polymeric material. In still another embodiment, the barrier layer may comprise a nitride material layer. The inductor may further include a plating seed layer on the barrier layer and a conductive fill material abutting the plating seed layer.