Piezoelectric Electrode Protective Layer for Stable Interconnects

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Designing filters for high-frequency applications above 2 GHz that provide effective filtering while preventing spurious modes is challenging, and conventional etching processes for piezoelectric devices lead to oxidation and performance variations due to uncontrollable surface roughness and ohmic contact losses.

Innovation Solution

A conductive protective layer is applied to the electrode of piezoelectric devices to prevent oxidation and improve interconnection performance, reducing process variations and enhancing yield by providing a consistent interface for interconnects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If conventional etching processes are used to form interconnects, then manufacturing simplicity is maintained, but oxidation occurs and performance variations increase due to uncontrollable surface roughness and ohmic contact losses

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidperformance consistency

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

A conductive protective layer is applied to the electrode surface before the interconnect formation process. This preliminary action prevents oxidation of the electrode surface during subsequent manufacturing steps, ensuring consistent electrical properties and reducing performance variations without complicating the overall manufacturing process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The conductive protective layer acts as an intermediary between the electrode and the interconnect. It provides a stable, oxidation-resistant interface that maintains consistent electrical contact, reducing ohmic contact losses and surface roughness-related performance variations while allowing the interconnect to be formed using conventional processes.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If no protective layer is applied, then device complexity is minimized, but electrical parasitics increase and interconnection performance deteriorates due to oxidation and surface roughness

Engineering Contradiction:

Improvestructure simplicityVSAvoidelectrical parasitics

Core Design Contradiction:

Device complexityVSLoss of energy

Solution Approach 1:

A thin conductive protective layer is applied to the electrode surface to prevent oxidation and reduce electrical parasitics. This layer serves as a sacrificial protective element that can be formed using standard thin-film deposition processes, minimizing added complexity while significantly improving electrical performance by preventing surface degradation.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If the electrode surface is left exposed, then manufacturing steps are reduced, but scattering and absorption losses increase due to oxidation and surface irregularities

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidscattering and absorption losses

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The conductive protective layer is applied in advance to the electrode surface before interconnect formation. This preliminary protective action prevents oxidation and surface roughness development, thereby reducing scattering and absorption losses in the final device without adding significant manufacturing steps or reducing productivity.

Inventive Principle:

Principle #10Preliminary action

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 conductive protective layer stabilizes the electrode, minimizing electrical parasitics and reducing scattering and absorption losses, thereby improving yield and reducing performance variations in piezoelectric devices.

Implementation Method 1

A conductive protective layer is applied to the electrode of piezoelectric devices to prevent oxidation

Methodology Applied

Scientific EffectOxidation prevention: Oxidation

Implementation Method 2

The conductive protective layer stabilizes the electrode, minimizing electrical parasitics and reducing scattering and absorption losses

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20260051868A1Piezoelectric device with conductive protective layer interconnects

Publication Date: 2026.02.19 RF360 SINGAPORE PTE LTD

AI summary

Aspects are disclosed for a piezoelectric device and a method of manufacturing a piezoelectric device. For example, the piezoelectric device can include a substrate, a piezoelectric layer, and an electrode formed on the substrate. The electrode includes a conductive layer and a conductive protective layer that is different from the conductive layer. The piezoelectric device can further include an interconnect formed on the piezoelectric layer over the conductive protective layer of the electrode. The interconnect provides an electrical path from the electrode to the piezoelectric layer.