What This Document Is
This document comprises lecture notes from EE143 Microfabrication Technology at UC Berkeley, specifically focusing on the fabrication of Micro-Electro-Mechanical Systems (MEMS). It delves into the fundamental mechanical properties of materials used in MEMS design and manufacturing, and explores critical considerations for successful device creation. This material represents a core component of understanding the practical challenges and solutions within the field of microfabrication.
Why This Document Matters
Students enrolled in microfabrication courses, or those pursuing careers in MEMS development, will find this resource invaluable. It’s particularly useful when studying material science as it applies to micro-scale devices, or when preparing to design and implement MEMS fabrication processes. Engineers and researchers needing a refresher on the mechanical behavior of thin films and microstructures will also benefit. Access to the full content will provide a deeper understanding needed for successful project work and advanced study.
Topics Covered
* Stress and Strain analysis in materials
* Mechanical properties of common microelectronic materials (Silicon, Alumina, Polymers, etc.)
* Young’s Modulus and Poisson’s Ratio and their application to material selection
* Stress-Strain characteristics: elastic and plastic deformation
* Material choices based on stiffness and strength requirements
* The impact of microstructure on material stress (specifically in polysilicon films)
* Fundamentals of Silicon-on-Insulator (SOI) wafer usage in MEMS fabrication
What This Document Provides
* Detailed explanations of key mechanical concepts like tensile/compressive stress and strain.
* Comparative data on the mechanical properties of various substrates and films used in MEMS.
* Graphical representations illustrating material behavior under stress.
* Discussions on the relationship between process conditions and resulting material stress.
* An overview of how material properties influence MEMS device performance.
* Visual aids depicting microstructural variations in deposited films.
