What should you major in in order to be a successful researcher in the field of semiconductors?
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It's true that one day we'll hit the physical limits of how small traditional transistors can be. That's because once you hit the nanoscale, you're dealing with the bizarre world of quantum mechanics. In this world, matter and energy behave in ways that seem counterintuitive. Quantum physics is very different from classic physics -- you can't even observe something on the quantum scale without affecting its behavior. One quantum effect is electron tunneling. Electron tunneling is a bit like teleportation. When material is very thin, electrons can tunnel right through it as if it weren't there at all. The electron doesn't actually make a hole through the material. Instead, the electron disappears from one side of the barrier and reappears on the other. Since gates are meant to control the flow of electrons, this is a problem.
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Higher leakage currents: this can lead to more heating issues and can easily result in thermal runaway. Signal to noise ration will decrease as thermal noise increases: This can result in a higher bit error rate, this will cause a program to be misread and commands to be misinterpreted. This can cause "random" operation. Dopants become more mobile with heat. When you have a fully overheated chip the transistor can cease being transistors.This is irreversible. Uneven heating can make the crystalline structure of Si break down. A normal person can experience by putting glass through temperature shock. It will shatter, a bit extreme, but it illustrates the point. This is irreversible.
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A diode is a special type of semiconductor that has many uses. One of the principle uses though is to control the direction of the flow of electricity. The most common type of diode does this by using something called “p-n junctions”. This is just a fancy way of saying “magic”. Really though, in simple terms, think of a Dr. Pepper can divided in the middle. On one half you have made a semiconductive material that you’ve added impurities to so that it contains negatively charged carriers; basically an abundance of electrons. We then call this side an “n-type semiconductor”. On the other half you’ve done the same thing, except you’ve introduced impurities that contain positively charged carriers; basically think of it like a bunch of holes that need filled by electrons. We call this side a “p-type semiconductor”. So we have on one side an n-type semiconductor and on the other side a p-type semiconductor. The boundary between these two is called the “p-n junction”.
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The weirdness of the quantum world is well documented. The double slit experiment, showing that light behaves as both a wave and a particle, is odd enough – particularly when it is shown that observing it makes it one or the other.
But it gets stranger. According to an experiment proposed by the physicist John Wheeler in 1978 and carried out by researchers in 2007, observing a particle now can change what happened to another one – in the past.
According to the double slit experiment, if you observe which of two slits light passes through, you force it to behave like a particle. If you don’t, and observe where it lands on a screen behind the slits, it behaves like a wave.
But if you wait for it to pass through the slit, and then observe which way it came through, it will retroactively force it to have passed through one or the other. In other words, causality is working backwards: the present is affecting the past.
Of course in the lab this only has an effect over indescribably tiny fractions of a second. But Wheeler suggested that light from distant stars that has bent around a gravitational well in between could be observed in the same way: which could mean that observing something now and changing what happened thousands, or even millions, of years in the past.
Almost every piece of equipment that stores, transmits, displays, or manipulates information has at its core silicon chips filled with electronic circuitry. These chips each house many thousands or even millions of transistors. The history of the transistor begins with the dramatic scientific discoveries of the 1800's scientists like Maxwell, Hertz, Faraday, and Edison made it possible to harness electricity for human uses. Inventors like Braun, Marconi, Fleming, and DeForest applied this knowledge in the development of useful electrical devices like radio. Their work set the stage for the Bell Labs scientists whose challenge was to use this knowledge to make practical and useful electronic devices for communications. Teams of Bell Labs scientists, such as Shockley, Brattain, Bardeen, and many others met the challenge.--and invented the information age. They stood on the shoulders of the great inventors of the 19th century to produce the greatest invention of the our time: the transistor. The transistor was invented in 1947 at Bell Telephone Laboratories by a team led by physicists John Bardeen, Walter Brattain, and William Shockley. At first, the computer was not high on the list of potential applications for this tiny device. This is not surprising—when the first computers were built in the 1940s and 1950s, few scientists saw in them the seeds of a technology that would in a few decades come to permeate almost every sphere of human life.
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An image sensor is a device that converts an optical image to an electric signal, and is used primarily in digital cameras and other imaging devices. The image sensor market is divided into five key demand categories: mobile phones, digital cameras, digital camcorders, automotive and industrial applications. Although the digital still camera market was the first to experience major demand for image sensors, mobile phones now dominate, with industrial and automotive markets fast emerging. Image sensors themselves can either be a charge-coupled device (CCD) image sensor or a complementary metal-oxide semiconductor (CMOS) sensor. CCD sensors use a special manufacturing process to be able to transport a charge across the chip without distortion, and so ensuring high-quality images with plenty of pixels and excellent light sensitivity. CMOS sensors can be manufactured on standard silicon production lines, and tend to be much cheaper than CCD sensors. CMOS sensors often include amplifiers, noise-correction, and digitization circuits, and the additional circuitry results in inferior light sensitivity. CMOS sensors, however, are more power efficient than CCD sensors, and are more in demand for low power applications such as mobile phones. To counter some of the limitations of traditional CMOS sensors, BSI technology was developed.
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