What This Document Is
This document comprises lecture notes from EE143 Microfabrication Technology at UC Berkeley, specifically focusing on the critical aspects of MEMS (Micro-Electro-Mechanical Systems) fabrication. It delves into the fundamental mechanical properties of materials used in MEMS devices and how these properties influence design and performance. The material presented is geared towards upper-level undergraduate and graduate students in engineering disciplines.
Why This Document Matters
Students enrolled in microfabrication courses, or those working on projects involving MEMS devices, will find this resource particularly valuable. It’s ideal for reinforcing concepts presented in lectures, preparing for assignments, and building a strong foundation in the mechanical considerations essential for successful MEMS design and fabrication. Understanding these principles is crucial for anyone aiming to develop robust and reliable micro-scale systems. This material is most helpful when studied in conjunction with hands-on lab experience and other course materials.
Topics Covered
* Stress and Strain fundamentals in materials
* Young’s Modulus and Poisson’s Ratio for various microfabrication materials
* Stress-Strain characteristics: elastic and plastic deformation
* Mechanical properties of common substrates and films used in MEMS
* Material selection criteria based on stiffness and strength
* Effective Young’s Modulus calculations for composite layers
* The role of Poly-Silicon as a structural material in MEMS
* Impact of microstructure on Poly-Si mechanical properties
What This Document Provides
* A detailed exploration of key mechanical properties relevant to microfabrication.
* Comparative data on material properties, allowing for informed material selection.
* Conceptual frameworks for understanding material behavior under stress.
* Illustrative diagrams and figures to aid in visualizing complex concepts.
* An overview of how material properties impact the performance of MEMS devices.
* Discussion of the compatibility of materials with standard IC fabrication processes.