Filled MEMS Via Structure for Uniform Hinge Width
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microelectromechanical system (MEMS) devices face issues with non-uniformity of hinge metal dimensions leading to undesirable durability and movement variance in phase-light modulators (PLM) or spatial light modulators (SLM) due to variations in hinge metal dimensions across the array.
Innovation Solution
Incorporating filled vias with a metal layer and oxide filler between layers to achieve uniformity in via dimensions, enhancing durability and movement consistency by using spin-on oxide filler and etching processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional via structures are used without filler, then manufacturing process is simpler, but hinge width uniformity and mechanical strength are insufficient
Solution Approach 1:
The via structure uses a composite material system consisting of a metal layer (providing electrical connectivity and structural support) combined with an oxide filler material (providing mechanical strength and dimensional uniformity). This composite approach allows the via to simultaneously achieve electrical functionality and enhanced mechanical properties, resolving the contradiction between manufacturing precision and device complexity by integrating multiple material functions into a single structured component.
2Reliability
If hinge metal dimensions are not controlled uniformly, then manufacturing is easier, but durability and movement consistency deteriorate
Solution Approach 1:
The invention changes the physical and chemical parameters of the via structure by introducing oxide filler material with specific properties (dielectric constant, mechanical strength, etch selectivity). This parameter change enables precise control over hinge width uniformity and mechanical strength, allowing the manufacturing process to achieve both high reliability and consistent dimensionality across the array.
3Strength
If filled vias with oxide filler are used, then hinge rigidity and mechanical strength improve, but manufacturing process complexity increases
Solution Approach 1:
The manufacturing process performs preliminary actions by pre-forming the oxide filler material in the via holes before final hinge metal deposition. This preliminary filling action ensures that the via structure already has the required mechanical strength and dimensional stability before subsequent processing steps, thereby achieving enhanced hinge rigidity while managing manufacturing complexity through staged process design.
4Manufacturing precision
If non-uniform hinge metal dimensions are accepted, then production cost is lower, but device performance and reliability worsen
Solution Approach 1:
The oxide filler material acts as an intermediary element between the via hole structure and the hinge metal layers. This intermediary provides a controlled interface that ensures uniform hinge width and consistent mechanical properties across all devices in the array, thereby achieving high manufacturing precision without significantly compromising production efficiency through the use of standard semiconductor fabrication techniques.
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 use of filled vias with oxide filler improves hinge width uniformity, rigidity, and mechanical strength, ensuring consistent movement and reliability of MEMS devices, particularly in PLM and SLM applications.
Implementation Method 1
filling the via with spin-on oxide filler
Data Source
AI summary
A microelectromechanical system (MEMS) device includes: a mechanical layer; a second layer; and a via coupled between the mechanical layer and the second layer. The via comprising a metal layer having a bottom and sides, and oxide on the bottom of the metal layer between the sides of the metal layer.