Dawon Kahng ( ko, 강대원; May 4, 1931 – May 13, 1992) was a Korean-American electrical engineer and inventor, known for his work in
solid-state electronics
Solid-state electronics means semiconductor electronics: electronic equipment using semiconductor devices such as transistors, diodes and integrated circuits (ICs). The term is also used as an adjective for devices in which semiconductor electr ...
. He is best known for inventing the
MOSFET
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon. It has an insulated gate, the voltage of which d ...
(metal–oxide–semiconductor field-effect transistor, or MOS transistor), along with his colleague
Mohamed Atalla
Mohamed M. Atalla ( ar, محمد عطاالله; August 4, 1924 – December 30, 2009) was an Egyptian-American engineer, physicist, cryptographer, inventor and entrepreneur. He was a semiconductor pioneer who made important contributions t ...
, in 1959. Kahng and Atalla developed both the
PMOS and
NMOS processes for MOSFET
semiconductor device fabrication
Semiconductor device fabrication is the process used to manufacture semiconductor devices, typically integrated circuit (IC) chips such as modern computer processors, microcontrollers, and memory chips such as NAND flash and DRAM that are ...
. The MOSFET is the most widely used type of
transistor
upright=1.4, gate (G), body (B), source (S) and drain (D) terminals. The gate is separated from the body by an insulating layer (pink).
A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch ...
, and the basic element in most modern
electronic equipment
The field of electronics is a branch of physics and electrical engineering that deals with the emission, behaviour and effects of electrons using electronic devices. Electronics uses active devices to control electron flow by amplification ...
.
Kahng and Atalla later proposed the concept of the MOS
integrated circuit
An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of tiny ...
, and they did pioneering work on
Schottky diode
The Schottky diode (named after the German physicist Walter H. Schottky), also known as Schottky barrier diode or hot-carrier diode, is a semiconductor diode formed by the junction of a semiconductor with a metal. It has a low forward voltage ...
s and
nanolayer-base
transistor
upright=1.4, gate (G), body (B), source (S) and drain (D) terminals. The gate is separated from the body by an insulating layer (pink).
A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch ...
s in the early 1960s. Kahng then invented the
floating-gate MOSFET
The floating-gate MOSFET (FGMOS), also known as a floating-gate MOS transistor or floating-gate transistor, is a type of metal–oxide–semiconductor field-effect transistor (MOSFET) where the gate is electrically isolated, creating a floating no ...
(FGMOS) with
Simon Min Sze in 1967. Kahng and Sze proposed that FGMOS could be used as
floating-gate memory cells for
non-volatile memory
Non-volatile memory (NVM) or non-volatile storage is a type of computer memory that can retain stored information even after power is removed. In contrast, volatile memory needs constant power in order to retain data.
Non-volatile memory typi ...
(NVM) and reprogrammable
read-only memory
Read-only memory (ROM) is a type of non-volatile memory used in computers and other electronic devices. Data stored in ROM cannot be electronically modified after the manufacture of the memory device. Read-only memory is useful for storing ...
(ROM), which became the basis for
EPROM
An EPROM (rarely EROM), or erasable programmable read-only memory, is a type of programmable read-only memory (PROM) chip that retains its data when its power supply is switched off. Computer memory that can retrieve stored data after a power s ...
(erasable
programmable ROM),
EEPROM
EEPROM (also called E2PROM) stands for electrically erasable programmable read-only memory and is a type of non-volatile memory used in computers, usually integrated in microcontrollers such as smart cards and remote keyless systems, or ...
(electrically erasable programmable ROM) and
flash memory
Flash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash memory, NOR flash and NAND flash, are named for the NOR and NAND logic gates. Both use ...
technologies. Kahng was inducted into the
National Inventors Hall of Fame
The National Inventors Hall of Fame (NIHF) is an American not-for-profit organization, founded in 1973, which recognizes individual engineers and inventors who hold a U.S. patent of significant technology. Besides the Hall of Fame, it also oper ...
in 2009.
Biography
Dawon Kahng was born on May 4, 1931, in
Keijō,
Chōsen (today
Seoul
Seoul (; ; ), officially known as the Seoul Special City, is the Capital city, capital and largest metropolis of South Korea.Before 1972, Seoul was the ''de jure'' capital of the North Korea, Democratic People's Republic of Korea (North Korea ...
,
South Korea
South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korea, Korean Peninsula and sharing a Korean Demilitarized Zone, land border with North Korea. Its western border is formed ...
). He studied physics at
Seoul National University
Seoul National University (SNU; ) is a national public research university located in Seoul, South Korea. Founded in 1946, Seoul National University is largely considered the most prestigious university in South Korea; it is one of the three " ...
in
South Korea
South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korea, Korean Peninsula and sharing a Korean Demilitarized Zone, land border with North Korea. Its western border is formed ...
, and immigrated to the
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country Continental United States, primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., ...
in 1955 to attend
Ohio State University
The Ohio State University, commonly called Ohio State or OSU, is a public land-grant research university in Columbus, Ohio. A member of the University System of Ohio, it has been ranked by major institutional rankings among the best pub ...
, where he received a doctorate in electrical engineering in 1959.
file:MOSFET Structure.png, left, The
MOSFET
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon. It has an insulated gate, the voltage of which d ...
was invented by Kahng along with his colleague
Mohamed Atalla
Mohamed M. Atalla ( ar, محمد عطاالله; August 4, 1924 – December 30, 2009) was an Egyptian-American engineer, physicist, cryptographer, inventor and entrepreneur. He was a semiconductor pioneer who made important contributions t ...
at Bell Labs in 1959.
He was a researcher at Bell Labs, Bell Telephone Laboratories in Murray Hill, New Jersey, and he invented
MOSFET
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon. It has an insulated gate, the voltage of which d ...
(metal-oxide-semiconductor field-effect transistor), which is the basic element in most of today's electronic equipment, with
Mohamed Atalla
Mohamed M. Atalla ( ar, محمد عطاالله; August 4, 1924 – December 30, 2009) was an Egyptian-American engineer, physicist, cryptographer, inventor and entrepreneur. He was a semiconductor pioneer who made important contributions t ...
in 1959. They
fabricated both
PMOS and
NMOS devices with a
20µm process.
Extending their work on MOS technology, Kahng and Atalla next did pioneering work on
hot carrier devices, which used what would later be called a
Schottky barrier
A Schottky barrier, named after Walter H. Schottky, is a potential energy barrier for electrons formed at a metal–semiconductor junction. Schottky barriers have rectifying characteristics, suitable for use as a diode. One of the primary ch ...
.
The
Schottky diode
The Schottky diode (named after the German physicist Walter H. Schottky), also known as Schottky barrier diode or hot-carrier diode, is a semiconductor diode formed by the junction of a semiconductor with a metal. It has a low forward voltage ...
, also known as the Schottky-barrier diode, was theorized for years, but was first practically realized as a result of the work of Kahng and Atalla during 19601961.
They published their results in 1962 and called their device the "hot electron" triode structure with semiconductor-metal emitter. The Schottky diode went on to assume a prominent role in
mixer
Mixer may refer to:
Electronics
* DJ mixer, a type of audio mixing console used by disc jockeys
* Electronic mixer, electrical circuit for adding signal voltages
* Frequency mixer, electrical circuit that creates new frequencies from two signals ...
applications.
They later conducted further research on high-frequency Schottky diodes.
In 1962, Kahng and Atalla proposed and demonstrated an early
metal
A metal (from ancient Greek, Greek μέταλλον ''métallon'', "mine, quarry, metal") is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electrical resistivity and conductivity, e ...
nanolayer-base
transistor
upright=1.4, gate (G), body (B), source (S) and drain (D) terminals. The gate is separated from the body by an insulating layer (pink).
A transistor is a semiconductor device used to Electronic amplifier, amplify or electronic switch, switch ...
. This device has a metallic layer with
nanometric thickness sandwiched between two semiconducting layers, with the metal forming the base and the semiconductors forming the emitter and collector. With its low resistance and short transit times in the thin metallic nanolayer base, the device was capable of high operation
frequency
Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as ''temporal frequency'' for clarity, and is distinct from ''angular frequency''. Frequency is measured in hertz (Hz) which is eq ...
compared to
bipolar transistors. Their pioneering work involved depositing metal layers (the base) on top of
single crystal semiconductor substrates (the collector), with the emitter being a
crystalline
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macros ...
semiconductor piece with a top or a blunt corner pressed against the metallic layer (the point contact). They deposited
gold
Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile ...
(Au)
thin films
A thin film is a layer of material ranging from fractions of a nanometer ( monolayer) to several micrometers in thickness. The controlled synthesis of materials as thin films (a process referred to as deposition) is a fundamental step in many ...
with a thickness of
10 nm
The following are examples of orders of magnitude for different lengths.
__TOC__
Overview
Detailed list
To help compare different orders of magnitude, the following list describes various lengths between 1.6 \times 10^ metres and 1 ...
on
n-type germanium
Germanium is a chemical element with the symbol Ge and atomic number 32. It is lustrous, hard-brittle, grayish-white and similar in appearance to silicon. It is a metalloid in the carbon group that is chemically similar to its group neighbors ...
(n-Ge), while the point contact was n-type silicon (n-Si).
Along with his colleague
Simon Min Sze, he invented the
floating-gate MOSFET
The floating-gate MOSFET (FGMOS), also known as a floating-gate MOS transistor or floating-gate transistor, is a type of metal–oxide–semiconductor field-effect transistor (MOSFET) where the gate is electrically isolated, creating a floating no ...
, which they first reported in 1967. They also invented the
floating-gate memory cell, the foundation for many forms of
semiconductor memory
Semiconductor memory is a digital electronic semiconductor device used for digital data storage, such as computer memory. It typically refers to devices in which data is stored within metal–oxide–semiconductor (MOS) memory cells on a si ...
devices. He invented floating-gate
non-volatile memory
Non-volatile memory (NVM) or non-volatile storage is a type of computer memory that can retain stored information even after power is removed. In contrast, volatile memory needs constant power in order to retain data.
Non-volatile memory typi ...
in 1967, and proposed that the floating gate of an MOS semiconductor device could be used for the cell of a reprogrammable ROM, which became the basis for
EPROM
An EPROM (rarely EROM), or erasable programmable read-only memory, is a type of programmable read-only memory (PROM) chip that retains its data when its power supply is switched off. Computer memory that can retrieve stored data after a power s ...
(erasable
programmable ROM),
EEPROM
EEPROM (also called E2PROM) stands for electrically erasable programmable read-only memory and is a type of non-volatile memory used in computers, usually integrated in microcontrollers such as smart cards and remote keyless systems, or ...
(electrically erasable programmable ROM) and
flash memory
Flash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash memory, NOR flash and NAND flash, are named for the NOR and NAND logic gates. Both use ...
technologies. He also conducted research on
ferro-electric semiconductors and luminous materials, and made important contributions to the field of
electroluminescence
Electroluminescence (EL) is an optical and electrical phenomenon, in which a material emits light in response to the passage of an electric current or to a strong electric field. This is distinct from black body light emission resulting fro ...
.
After retiring from Bell Laboratories, he became the founding president of the
NEC Research Institute in New Jersey. He was a fellow of the IEEE and a fellow of the Bell Laboratories. He was also a recipient of the
Stuart Ballantine Medal of the
Franklin Institute
The Franklin Institute is a science museum and the center of science education and research in Philadelphia, Pennsylvania. It is named after the American scientist and statesman Benjamin Franklin. It houses the Benjamin Franklin National Memori ...
and the Distinguished Alumnus Award of the
Ohio State University College of Engineering
The Ohio State University College of Engineering, including the Knowlton School is the academic unit that manages engineering research and education at Ohio State University. The college can trace its origins to 1870 when the Ohio General Assemb ...
. He died of complications following emergency surgery for a ruptured aortic aneurysm in 1992.
Awards and honors
Kahng and
Mohamed Atalla
Mohamed M. Atalla ( ar, محمد عطاالله; August 4, 1924 – December 30, 2009) was an Egyptian-American engineer, physicist, cryptographer, inventor and entrepreneur. He was a semiconductor pioneer who made important contributions t ...
were awarded the
Stuart Ballantine Medal at the 1975
Franklin Institute Awards
The Franklin Institute Awards (or Benjamin Franklin Medal) is an American science and engineering award presented by the Franklin Institute, a science museum in Philadelphia. The Franklin Institute awards comprises the Benjamin Franklin Medals ...
, for their invention of the MOSFET. In 2009, Kahng was inducted into the
National Inventors Hall of Fame
The National Inventors Hall of Fame (NIHF) is an American not-for-profit organization, founded in 1973, which recognizes individual engineers and inventors who hold a U.S. patent of significant technology. Besides the Hall of Fame, it also oper ...
. In 2014, the 1959 invention of the MOSFET was included on the
list of IEEE milestones in electronics.
References
{{DEFAULTSORT:Kahng, Dawon
1931 births
1992 deaths
20th-century American engineers
20th-century American inventors
American electrical engineers
Semiconductor physicists
Benjamin Franklin Medal (Franklin Institute) laureates
MOSFETs
NEC people
Ohio State University alumni
People from Seoul
South Korean emigrants to the United States
South Korean engineers
South Korean inventors