ESD: Physics and Devices / Edition 1

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Overview

This volume is the first in a series of three books addressing Electrostatic Discharge (ESD) physics, devices, circuits and design across the full range of integrated circuit technologies. ESD Physics and Devices provides a concise treatment of the ESD phenomenon and the physics of devices operating under ESD conditions. Voldman presents an accessible introduction to the field for engineers and researchers requiring a solid grounding in this important area. The book contains advanced CMOS, Silicon On Insulator, Silicon Germanium, and Silicon Germanium Carbon. In addition it also addresses ESD in advanced CMOS with discussions on shallow trench isolation (STI), Copper and Low K materials.

  • Provides a clear understanding of ESD device physics and the fundamentals of ESD phenomena.
  • Analyses the behaviour of semiconductor devices under ESD conditions.
  • Addresses the growing awareness of the problems resulting from ESD phenomena in advanced integrated circuits.
  • Covers ESD testing, failure criteria and scaling theory for CMOS, SOI (silicon on insulator), BiCMOS and BiCMOS SiGe (Silicon Germanium) technologies for the first time.
  • Discusses the design and development implications of ESD in semiconductor technologies.

An invaluable reference for EMC non-specialist engineers and researchers working in the fields of IC and transistor design. Also, suitable for researchers and advanced students in the fields of device/circuit modelling and semiconductor reliability.

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Editorial Reviews

From the Publisher

"…this is a good device book about ESD. Many useful equations are derived and explained." (IEEE Circuits & Devices, January/February 2006)

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Product Details

  • ISBN-13: 9780470847534
  • Publisher: Wiley
  • Publication date: 11/5/2004
  • Edition number: 1
  • Pages: 420
  • Product dimensions: 6.89 (w) x 9.84 (h) x 1.16 (d)

Meet the Author

Dr Steven H. Voldman received his B.S. in Engineering Science from the University of Buffalo (1979); M.S. EE (1981) and Electrical Engineer Degree (1982) from M.I.T; MS Engineering Physics (1986) and Ph.D EE (1991) from the University of Vermont under IBM's Resident Study Fellow Program. At M.I.T, he worked as a member of the M.I.T. Plasma Fusion Center, and the High Voltage Research Laboratory (HVRL). At IBM, as a reliability device engineer, his work include pioneering work in bipolar/ CMOS SRAM alpha particle and cosmic ray SER simulation, MOSFET gate-induced drain leakage (GIDL) mechanism, hot electron, epitaxy/well design, CMOS latchup, and ESD. Since 1986, he has been responsible for defining the IBM ESD/latchup strategy for CMOS, SOI, BiCMOS and RF CMOS and SiGe technologies. He has authored ESD and latchup publications in the area of MOSFET Scaling, device simulations, copper, low-k, MR heads, CMOS, SOI , Sage and SiGeC technology. Voldman served as SEMATECH ESD Working Group Chairman (1996-2000), ESD Association General Chairman and Board of Directors, International  Reliability Physics (IRPS) ESD/Latchup Chairman, International Physical and Failure Analysis (IPFA) Symposium ESD Sub-Committee Chairman, ESD Association Standard Development Chairman on Transmission Line Pulse Testing, ESD Education  Committee, and serves on the ISQED Committee, Taiwan ED Conference (T-ESDC) Technical Program Committee. Voldman has provided ESD lectures for universities (e.g. MIT Lecture Series, Taiwan National Chiao-Tung University, and Singapore Nanyang Technical University). He is a recipient of over 125 US patents, over 100 publications, and also provides talks on patenting, and invention. He has been featured in EE Times, Intellectual Property Law and Business and authored the first article on ESD phenomena for the October 2002  edition of  Scientific American entitled Lightening Rods for Nanostructures, and Pour La Science, Le Scienze, and Swiat Nauk international editions. Dr. Voldman was recently accepted as the first IEEE Fellow for ESD phenomena in semiconductors for ' contributions to electrostatic discharge protection CMOS, SOI and SiGe technologies'.

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Read an Excerpt

ESD Physics and Devices


By Steven Howard Voldman

John Wiley & Sons

Copyright © 2004 John Wiley & Sons, Ltd
All right reserved.

ISBN: 0-470-84753-0


Chapter One

Electrostatics and Electrothermal Physics

1.1 INTRODUCTION

The discovery of electrostatic attraction and electrostatic discharge (ESD) is one of the earliest examples of the understanding of scientific thought and analysis. It goes back to the early foundations of the problem of the nature of matter, astronomy, mathematics and philosophy, and predates understanding of the nature of matter.

Thales of Miletus (624-546 B.C.E) was the founder of the Ionian (or Milesian) school and one of the Seven Wise Men of Ancient Greece in the pre-Socratic era. Thales was an astronomer, mathematician, and philosopher. He was an inventor and an engineer. Thales established a heritage of searching for knowledge for knowledge's sake, development of the scientific method, establishment of practical methods, and application of a conjectural approach to questions of natural phenomena. The Milesian School is regarded as establishing the critical method of philosophy of questioning, debate, explanation, justification and criticism. Students of Thales included Euclid, Pythagoras and Eudemus.

It was Thales of Miletus who was credited with the discovery of the electrostatic attraction. Thales noted that, after amber was rubbed, straw was attracted to the piece ofamber. It was from this event that, the Greek word for amber, [epsilon][lambda][epsilon][kappa][tau][rho]ov (electron) became associated with electrical phenomena. Knowledge of Thales' ideas was common through the writings of his disciples and Greek philosophers. Aristotle stated 'Some think that the soul pervades the whole universe, whence perhaps came Thales' view that everything is full of gods.'

Investigation of electrostatic phenomena predated early thoughts on the nature of physical matter. Thales's ESD experiments and study of electrostatic attraction occurred before the Greek atomistic schools of Democritus (420 B.C.E.), and Epicurus (370 B.C.E.), and the Roman school of Lucretius (50 B.C.E). Thales died before the schools of atomic thought were active. His tomb was inscribed 'Here in a narrow tomb Great Thales lies; Yet his renown for wisdom reached the skies.'

Robert A. Millikan, in the Introduction of his 1917 edition of The Electron stated:

Perhaps it is merely a coincidence that the man who first noticed rubbing of amber would induce in it a new and remarkable state now known as the state of electrification was also the man who first gave expression to the conviction that there must be some great unifying principle which links together all phenomena and is capable of making them rationally intelligible; that behind all the apparent variety and change of things there is some primordial element, out of which all things are made and the search for which must be the ultimate aim of all natural science. Yet if this be merely coincidence, at any rate to Thales of Miletus must belong a double honor. For he first correctly conceived and correctly stated, as far back as 600 B.C., the spirit which has actually guided the development of physics in all ages, and he also first described, though in a crude and imperfect way, the very phenomenon the study of which has already linked together several of the erstwhile isolated departments of physics, such as radiant heat, light, magnetism, and electricity, and has very recently brought us nearer to the primordial element than we have ever been before.

J. H. Jeans, in the 1925 fifth edition of The Mathematical Theory of Electricity and Magnetism, wrote: 'The fact that a piece of amber, on being rubbed, attracted to itself other small bodies, was known to the Greeks, the discovery of this fact being attributed to Thales of Miletus.' This fact, and the discovery of magnetism from lodestone, formed the 'basis from which the modern science of Electromagnetism has grown.'

With the death of Thales of Miletus, little progress was made on ESD phenomena. Although history moved forward, the advancement of triboelectric charging and electrostatic discharge phenomenon was slow. Europe saw the Roman Empire, the Golden Age of Islam, the Middle Ages, the Black Death, the Renaissance, the Reformation, and the advancement of nation states. ESD was discovered by Thales while China was under the Zhou Dynasty. Asia experienced tremendous changes, through the Qin, Han, Sui, Tang, and Song, Yuan, and Ming dynastic periods, but with no advancement of this field of knowledge.

With all this social change, there was insignificant growth in the understanding of electrostatic phenomenon until the 18th century. Interest in tribocharging and electrostatic phenomena became a hobby of scientists supported by the courts of Europe and laboratories of France and England. Gilbert, in the 17th century, noted that interaction between a glass rod and silk produced the same phenomenon discussed by Thales of Miletus; materials when rubbed with silk became 'amberized'. Gilbert began construction of the earliest list of triboelectrification.

In the same period, Stephen Gray (1696-1736) thought of the concept of dividing of materials according to their nature of removing or sustaining electrification. He defined a class of materials which remove 'amberization' as conductors, and the class of materials which allowed a body to retain its electrification as nonconductors, or insulators.

This work was followed by French physicist Dufay in 1733 discovering that the same effect can be achieved with sealing wax and cat's fur, and noting the effect was different from that of a glass rod. Dufay first noted that there was an attractive and repulsive phenomenon between different materials, naming the opposite processes as 'vitreous' and 'resinous.'

Benjamin Franklin, the first American ESD engineer, in 1747, also identified two processes, which he divided into 'positive' and 'negative' processes. The 'positive' process was the first process, discovered by Gilbert, that a physical body was electrified positive if repelled by a glass rod which had been rubbed with silk. The 'negative' process is any body repelled from sealing wax which had been rubbed with cat's fur, extending the work of Dufay.

In this time frame, many electrostatic scientists began recording the relationship of one body to another in the electrification process. Lists of materials were made to construct the early triboelectrification chart:

Cat's skin, Glass, Ivory, Silk, Rock Crystal, The Hand, Wood, Sulphur, Flannel, Cotton, Shellac, Caoutchouc, Resins, Guttapercha, Metals, and Guncotton

Around this time, some electrostatic scientists and engineers explored phenomena around them, investigating ESD phenomena of garments, and possibly influencing the 'human body model'. Robert Symmer (1759) conducted experimental studies in the dark, exploring the electrical discharge phenomenon on removal of his stockings and the interactions of two different sets of stockings, placing two white stockings in one hand and two black stockings in the other. In contrast, Coulomb developed the torsion balance in 1785, beginning the serious process of the understanding of the relationship of force, charge and physical distance. The experiments of Coulomb had been performed by Cavendish at an earlier date, but not published until 1879 by Maxwell.

At this time, the relationship of positive and negative electrification were not fully understood. In 1837, Michael Faraday performed the 'ice-pail experiment' involving a glass rod and silk which showed that 'positive and negative electrical charges always appear simultaneously and in exactly equal amounts.' Faraday, in his lecture Forces of Matter: Lecture V Magnetism-Electricity provided demonstrations of electrostatic charging phenomena, demonstrating the relationship of positive and negative charging effects. He would close his lecture on electrical phenomena with 'This, then is sufficient, in the outset to give you an idea of the nature of the force which we call ELECTRICITY. There is no end to the things from which you can evolve this power.'

Even at this time frame, the understanding of the relationship of matter, electrical charging and electrical force were not well understood. Different models were proposed, including single electrical fluid models, and two-fluid models, to explain the charging process. Models were established to explain these phenomena as related to a stress or strain of the medium, moving from an atomistic perspective to a field representation. It was at this time frame that Faraday and James Clerk Maxwell began addressing the understanding of electricity and electrical forces in terms of a field perspective and electrical charge was viewed as a "state of strain in the ether." James Clerk Maxwell, in Electricity and Magnetism in 1873, created the formulation of electricity and magnetism as we understand it today.

In 1889, Paschen began analysis of the breakdown phenomenon in gases, trying to explain the relationship of breakdown in gases by relating gas pressure and electrode spacing. Breakdown phenomenon in media took a great leap forward, influencing ESD understanding in today's devices.

In 1891, the word 'electron' as a natural unit of electricity was suggested by Dr G. Johnstone Stoney, connecting the ideas of Faraday's Law of Electrolysis. At this time, the understanding of the connection to physical matter was not understood, but it was used as a measure or unit. Johnstone Stoney reconnected the idea to the Greek word for amber, relating the early work of Thales of Miletus to the modern concept of an electrical unit, later to be shown to be connected to the structure matter and atomic theory.

From this brief history, it can be seen that electrostatic attraction predates the earliest thoughts on the understanding of matter. From 600 B.C.E to even as late as the 1890s the relationship of the discovery of Thales of Miletus were not understood as connected to the transfer of electrons.

Modern physics opened the door to the understanding of the atom and the relationship to electrical charge. It is too vast an undertaking to begin this book with a discussion of modern physics and the evolution of the electrical engineering discipline.

The electrical engineering profession has been compartmentalized into different fields, disciplines and sub-disciplines. It was the microelectronic industry that has led to a return of interest in electrostatic discharge phenomena. In the last 25 years, with the growth of the semiconductor industry, ESD has been a discipline of significant interest. In the 1970s as a result of the concerns in the Cold War of electromagnetic pulses (EMP) excellent physical models were being produced to understand the ESD robustness of electrical components. In the 1980s with the growth of semiconductor fabrication and the semiconductor industry, ESD issues remained an issue as human handling, tooling, shipping and garments, influenced the reliability of semiconductor components. Although ESD concerns existed, the resources and growth was limited in the 1980s, leading to a primitive understanding of how to avoid failure mechanisms, and how to design ESD robust semiconductor processes, devices and circuits. In the 1990s, there has been tremendous growth in ESD understanding, but new fields and new issues continue to emerge. As we make the transition from microelectronics to nanostructures, all types of components, from semiconductors, magnetic recording devices, micromachines, to photomasks have a larger concern with ESD.

Electrostatic discharge is a cross-discipline, bridging thermal, mechanical, and electrical physics. A difficulty in its teaching is that it also spans physical scales from the microscopic to macroscopic. The discipline involves understanding from the atomic surfaces, to nanostructure devices, to circuits, and systems. It spans both space and time. In time, it spans a wide timescale, from picosecond phenomenon to steady state. This is the modern difficulty of understanding of quantification and prediction as it spans disciplines, physical scales, temporal scales, and modeling representation. To conquer this, we will rebuild our understanding and the focus will be on physical models which will progress to practical examples.

1.2 A TIME CONSTANT APPROACH

1.2.1 ESD Time Constants

To understand physical phenomena, and particularly ESD phenomenon, it is necessary to quantify the scale in both space and time. ESD phenomena involve microscopic to macroscopic scales. ESD phenomena involve electrical and thermal transport on the scale of nanometers, circuits and electronics on the scale of micrometers, semiconductor chip designs on the scale of millimeters, and systems on the scale of meters. The time scales of interest range from picoseconds to microseconds. Electrical currents of interest range from milliamps to tens of amperes. Voltages range of interest vary from volts to kilovolts. Temperatures vary from room temperature to melting temperatures of thousands of degrees Kelvin. It is the vast ranges of time, space, currents, voltages, and temperature as well as its transition from the microscopic to the macroscopic which makes ESD difficult to model, simulate, and quantify.

To comprehend ESD phenomena, and establish validity of analytical developments, it is important to be able understand what phenomenon is important. By analyzing the physical equations from a time constant approach, equations and understanding can be made rigorous, as well as improving logical clarity. In such a fashion, electrical and thermal phenomena can be understood. By familiarity with the important time constants of interest, our understanding as well as insight will be better served. It is through this process that one can establish a higher intuition in this complex field.

1.2.1.1 ESD events

To understand the role of ESD events and the physical environments, it is important to quantify the characteristic times of an ESD event. ESD events are represented as circuit equivalent models.

1.2.1.2 Human body model characteristic time

A fundamental model used in the ESD industry is known as the human body model (HBM) pulse. The model was intended to represent the interaction the electrical discharge from a human being, who is charged, with a component, or object. The model (Figure 1.1) assumes that the human being is the initial condition. The charged source then touches a component or object through a finger. The physical contact between the charged human being and the component or object allows for current transfer between the human being and the object. A characteristic time of the human body model is associated with the electrical components used to emulate the human being. In the HBM standard, the circuit component to simulate the charged human being is a 100 pF capacitor in series with a 1500[ohm] resistor.

Continues...


Excerpted from ESD Physics and Devices by Steven Howard Voldman Copyright © 2004 by John Wiley & Sons, Ltd. Excerpted by permission.
All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
Excerpts are provided by Dial-A-Book Inc. solely for the personal use of visitors to this web site.

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Table of Contents

About the Author.

Preface.

Acknowledgements.

1. Electrostatics and Electrothermal Physics.

2. Electrothermal and Methods of Analysis ESD Models.

3. Semiconductor Device Physics and ESD.

4. Substrates and ESD.

5. Wells and Sub-collectors and ESD.

6. Isolation Technology and ESD.

7. Drain Engineering, Salicides and ESD.

8. Dielectrics and ESD.

9. Interconnects and ESD.

10. Silicon on Insulator (SOI) and ESD.

11. Silicon-Germanium and ESD.

12. Nanostructures and ESD.

Index.

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Sort by: Showing all of 3 Customer Reviews
  • Posted February 20, 2011

    Highly recommended to circuit, device engineers and students

    This is an excellent book on ESD device physics, and the very first book in the great series (the most complete ESD series available on the market). All the major ESD building blocks and areas are fully covered and the texts are elegantly written with very helpful illustrations. A thorough coverage on device physics is the key feature of this book. The author obviously devoted a tremendous amount of time and effort into the writing of this great book. The treatment is comprehensive enough to make this book the textbook for an ESD device course. It's worth noting that the author is a world expert on ESD and integrated circuit technologies, and was named an IEEE fellow for his contributions in these areas. It's great that he shared lots of great materials and deep insights. Readers can learn a great deal about every single device used in ESD protection from this book. There is even a chapter for nanostructures. The theories and principles covered in this book will be very useful in many years ahead. I highly recommend this book to engineers in device, physics, and reliability, who can use this as a comprehensive book in ESD. Engineers with many years of experience will find this book useful as well.

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  • Anonymous

    Posted January 24, 2008

    A very good ESD book about ESD physics and devices

    I have had this book for a long time. This one is the first book of the author's ESD book series which cover the most comprehensive topics related to ESD protection comparing with other ESD books. This book is good and very rigorous, starting from basic ESD concepts, leading to the physics of ESD protection devices, then focusing on the topics of stringent ESD design issues. It takes the reader from an intuitive level of understanding ESD issues to a mathematical explanation based on his understanding. This book combines the depth of theory and practical applications which are based on the author's many years¿ industry experiences. It is suitable as both introductory and advanced. I have been done some ESD protection design projects and I always keep this book at hand as a tool book. This is a truly useful book.

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  • Anonymous

    Posted January 18, 2008

    A reviewer

    This book, ESD: Physics and Devices, is part of a 3-book series on Electrostatic Discharge (ESD) by the same author (Steven Voldman). One of the main strengths of this series (and there are very many) is that this is very recently published with new and updated datapoints, not to mention being the only series of ESD textbook. Essentially, this means that all the latest developments in the field is published in an easy-to-understand series. In this book, Voldman writes about the physics of ESD protection devices and circuits in his unique style which is illuminating both for experts and beginners alike. ESD implications for as technology changes are clearly stated and explained, with numerous data points measured from physical devices. I highly recommend this book series to all students of integrated circuit design and ESD.

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