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Transistor: the story on HearLore | HearLore
Transistor
The first working transistor was born in the quiet corridors of Bell Labs in Murray Hill, New Jersey, between the 17th of November and the 23rd of December 1947. John Bardeen and Walter Brattain, two physicists working under the watchful eye of William Shockley, stumbled upon a phenomenon that would eventually replace the fragile, power-hungry vacuum tubes that had dominated electronics for decades. They applied two gold point contacts to a crystal of germanium and observed that a signal emerged with output power greater than the input. This was the point-contact transistor, a solid-state device that required no cathode heater and consumed a fraction of the energy needed by its thermionic predecessors. The invention was so revolutionary that it earned Bardeen, Brattain, and Shockley the 1956 Nobel Prize in Physics, yet the path to that discovery was paved with years of theoretical groundwork and failed experiments that went largely unnoticed by the public.
Before this breakthrough, the world relied on the thermionic triode, a vacuum tube invented in 1907 that enabled long-distance telephony and amplified radio technology. These tubes were fragile glass envelopes that consumed substantial power and generated heat, often glowing orange as their cathodes warmed up. The transition from these bulky components to the tiny, durable transistor was not immediate. Julius Edgar Lilienfeld, a physicist, had proposed the concept of a field-effect transistor as early as 1925, filing patents in Canada and the United States, but the technology to produce high-quality semiconductor materials was decades away. His ideas remained theoretical until the mid-20th century, when the scientific community finally caught up to his vision. The initial point-contact transistor was a clumsy prototype, but it proved that solid-state amplification was possible, setting the stage for a technological revolution that would shrink the world's electronics from room-sized machines to devices that could fit in a pocket.
The Silicon Age Dawns
The transition from germanium to silicon marked the true beginning of the modern electronic age, a shift that began in earnest on the 26th of January 1954. Morris Tanenbaum at Bell Labs developed the first working silicon transistor, a material that offered superior thermal stability and lower leakage currents compared to the germanium used in the earliest devices. By May 1954, Texas Instruments announced the first production commercial silicon transistor, a feat achieved by Gordon Teal, an expert in growing crystals of high purity who had previously worked at Bell Labs. This switch in materials was critical because silicon could withstand higher temperatures and was more abundant, allowing for the mass production of reliable components that could operate in harsh environments.
The development of the metal-oxide-semiconductor field-effect transistor, or MOSFET, represented the next great leap forward, transforming the transistor from a specialized component into the fundamental building block of the digital age. Carl Frosch and Lincoln Derick accidentally discovered the surface passivation effects of silicon dioxide in 1955, a serendipitous finding that allowed them to manufacture the first planar transistors by 1957. This process involved growing a layer of silicon dioxide over the silicon wafer, which insulated and protected the device while preventing dopants from diffusing into the wafer. Mohamed Atalla and Dawon Kahng took this research further, proposing a silicon MOS transistor in 1959 and successfully demonstrating a working device in 1960. Their team, which included E. E. LaBate and E. I. Povilonis, proved that the MOSFET could be scaled to high densities, allowing for the integration of more than 10,000 transistors in a single integrated circuit. This scalability made the MOSFET the most widely used transistor, accounting for 99.9% of all transistors in the world by the late 20th century.
When was the first working transistor invented and who invented it?
The first working transistor was invented between the 17th of November and the 23rd of December 1947 by John Bardeen and Walter Brattain at Bell Labs. This point-contact transistor used a germanium crystal and two gold point contacts to amplify signals without requiring a cathode heater.
What year did the first production commercial silicon transistor become available?
Texas Instruments announced the first production commercial silicon transistor in May 1954. This device was developed by Gordon Teal and offered superior thermal stability and lower leakage currents compared to earlier germanium transistors.
Which transistor type accounts for 99.9% of all transistors in the world today?
The metal-oxide-semiconductor field-effect transistor or MOSFET accounts for 99.9% of all transistors in the world by the late 20th century. Mohamed Atalla and Dawon Kahng successfully demonstrated a working silicon MOS transistor in 1960, enabling the integration of more than 10,000 transistors in a single integrated circuit.
When was the first production-model pocket transistor radio released?
The Regency TR-1 was released in October 1954 as the first production-model pocket transistor radio. This device manufactured in Indianapolis featured four transistors and one germanium diode and was available in six colors including black, ivory, and mahogany.
How many transistors were in the first all-transistor car radio announced in 1955?
The first production all-transistor car radio was announced in the 28th of April 1955 edition of The Wall Street Journal by Chrysler and Philco. Chrysler made the Mopar model 914HR available as an option starting in the fall of 1955 for its new line of 1956 Chrysler and Imperial cars.
What is the maximum number of transistors found in an advanced microprocessor as of 2020?
An advanced microprocessor may contain as many as 92 billion transistors on a die and double that 184 billion when dual die. Exceptional chips reached 2.6 trillion transistors as of 2020, demonstrating the scalability of the MOSFET technology.
The commercialization of the transistor began with the Regency TR-1, released in October 1954, which was the first production-model pocket transistor radio. Manufactured in Indianapolis, Indiana, by a joint venture between the Regency Division of Industrial Development Engineering Associates and Texas Instruments, the device featured four transistors and one germanium diode. Its industrial design was outsourced to the Chicago firm of Painter, Teague and Petertil, and it was initially released in six colors: black, ivory, mandarin red, cloud grey, mahogany, and olive green. This device proved that transistors could be used in consumer electronics, but it was the Sony TR-63, released in 1957, that truly democratized the technology. Seven million TR-63s were sold worldwide by the mid-1960s, leading to the widespread adoption of transistor radios and the eventual replacement of vacuum tubes as the dominant electronic technology.
The integration of transistors into complex systems accelerated rapidly, with the first production all-transistor car radio developed by Chrysler and Philco announced in the 28th of April 1955 edition of The Wall Street Journal. Chrysler made the Mopar model 914HR available as an option starting in the fall of 1955 for its new line of 1956 Chrysler and Imperial cars, which reached dealership showrooms on the 21st of October 1955. Meanwhile, AT&T began using transistors in telecommunications equipment in the No. 4A Toll Crossbar Switching System in 1953, replacing the mechanical encoding of punched metal cards with electronic switching. The first high-frequency transistor, the surface-barrier germanium transistor developed by Philco in 1953, was capable of operating at frequencies up to 100 megahertz, a significant improvement over earlier models. These early applications demonstrated the versatility of the transistor, from controlling appliances and machinery to enabling the first digital computers and communication networks.
The Battle for the Gate
The history of the transistor is also a story of intellectual property disputes and the race to define the future of electronics. While Bardeen and Brattain invented the point-contact transistor in 1947, William Shockley claimed credit for the broader concept and attempted to base the first patent on the field-effect transistor, a device that had been theorized by Julius Edgar Lilienfeld decades earlier. Lawyers at Bell Labs advised against Shockley's proposal because the idea of a field-effect transistor using an electric field as a grid was not new, and Lilienfeld's patents had gone into obscurity. Instead, the team focused on the point-contact and junction transistors, which led to the 1956 Nobel Prize being shared among all three. However, the rivalry between Shockley and his former colleagues at Bell Labs would eventually lead to the formation of Fairchild Semiconductor, a company that would become the cradle of the Silicon Valley tech industry.
The development of the MOSFET was another battleground of innovation and competition. In 1963, Chih-Tang Sah and Frank Wanlass at Fairchild Semiconductor invented CMOS, or complementary MOS, which combined the properties of n-channel and p-channel transistors to create low-power logic circuits. This invention was crucial for the development of integrated circuits, as it allowed for the creation of complex logic gates that could be packed into tiny spaces. The self-aligned gate MOS transistor, developed by Robert Kerwin, Donald Klein, and John Sarace at Bell Labs in 1967, was further refined by Federico Faggin and Tom Klein at Fairchild to create the first silicon-gate MOS integrated circuit. These advancements paved the way for the modern microprocessor, which could contain as many as 92 billion transistors on a die, a number that has continued to grow with each generation of technology.
The Invisible Giants
Today, the transistor is the most numerously produced artificial object in history, with more than 13 sextillion manufactured by 2018. These tiny devices are the backbone of modern electronics, found in everything from smartphones to satellites. The MOSFET, which accounts for 99.9% of all transistors, is the basic building block of most modern electronics, enabling the digital age that began in the late 20th century. The ability to mass-produce transistors by a highly automated process from relatively basic materials has resulted in astonishingly low per-transistor costs, making them ubiquitous in almost every electronic device. A logic gate consists of up to about 20 transistors, whereas an advanced microprocessor may contain as many as 92 billion transistors on a die, and double that 184 billion when dual die, with exceptional chips reaching 2.6 trillion transistors as of 2020.
The impact of the transistor extends beyond mere numbers; it has fundamentally changed the way humans live, work, and communicate. Transistorized mechatronic circuits have replaced electromechanical devices in controlling appliances and machinery, making it easier and cheaper to use a standard microcontroller and write a computer program to carry out a control function than to design an equivalent mechanical system. The transistor's low cost, flexibility, and reliability have made it indispensable, from mobile phones to televisions, vast numbers of products include amplifiers for sound reproduction, radio transmission, and signal processing. Even as vacuum tubes retain advantages in very high operating frequencies or high operating voltages, such as in traveling-wave tubes and gyrotrons, the transistor remains the dominant technology of the 20th and 21st centuries, a silent revolution that has reshaped the world.
The Future of the Small
The evolution of the transistor continues to push the boundaries of physics and engineering, with new materials and structures being developed to overcome the limitations of traditional silicon-based devices. Researchers have created high-electron-mobility transistors, or HEMTs, which use a heterostructure of aluminum gallium arsenide and gallium arsenide to achieve twice the electron mobility of a GaAs-metal barrier junction. These devices are used in satellite receivers working at frequencies around 12 gigahertz, providing high speed and low noise for critical applications. Gallium nitride and aluminum gallium nitride HEMTs offer even higher electron mobility and are being developed for various applications, including power electronics and radiofrequency amplification.
The quest for smaller, faster, and more efficient transistors has led to the development of multi-gate devices, such as the FinFET, which originated from the research of Digh Hisamoto and his team at Hitachi Central Research Laboratory in 1989. This type of 3D non-planar multi-gate MOSFET uses fins on the silicon surface to control the flow of electrons, allowing for better performance and lower power consumption. More recent innovations include the Gate-All-Around FET, or GAAFET, which uses nanowires stacked vertically and surrounded on four sides by the gate, and the MBCFET, a variant of GAAFET that uses horizontal nanosheets instead of nanowires. These advanced structures are being developed by companies like Samsung and Intel to continue the trend of increasing transistor density and performance, ensuring that the transistor remains the cornerstone of electronic innovation for decades to come.
The Human Element
The story of the transistor is not just about materials and circuits; it is also about the people who made it possible. John Bardeen, Walter Brattain, and William Shockley were not just scientists; they were innovators who worked tirelessly to understand the mysteries of semiconductors. Bardeen and Brattain's initial success with the point-contact transistor was a result of their meticulous experimentation and collaboration, while Shockley's theoretical insights helped to expand the knowledge of semiconductors. Their work at Bell Labs laid the foundation for the modern electronics industry, and their legacy continues to inspire new generations of engineers and physicists.
The human element extends beyond the inventors to the countless workers and engineers who have contributed to the development and production of transistors. From the chemists at Texas Instruments who grew high-purity silicon crystals to the technicians who etched depressions into germanium bases to create the first high-frequency transistors, the transistor is a product of human ingenuity and perseverance. The story of the transistor is a testament to the power of collaboration, competition, and innovation, and it serves as a reminder that even the smallest devices can have the biggest impact on the world.