Subtitles section Play video Print subtitles MARK LUNDSTROM: Hi. I'm Mark Lundstrom. And I'd like to tell you a little bit about this course on nanotransistors that we're developing. Transistors are the basic building blocks of all electronic systems. They're everywhere. There are billions of them in these devices that we carry around. And when we fire up an app, and do a Google search, or whatever, there are many more billions that are doing the work out in the cloud. So they're an important device. They've really shaped the modern world. And they're also fascinating from a scientific perspective. This is what a transistor looks like. This is a cross-sectional electron micrograph. It's built on a piece of silicon. There are three main components, a source, a drain, and a gate that controls the flow of electrons from the source to the drain. When we switch the device on, electrons flow from the source to the drain and out the external lead. The first objective of this course is to understand the physical operation of these devices, the flow of electrons and holes inside the transistor. The second objective of this course is to relate what goes on the inside to the voltages that we apply to the terminals and to the currents that flow through those leads, to understand why the IV characteristics have this particular shape, and what makes a particular characteristic useful from an application perspective, and to relate all of that back to what goes on inside the transistor. Now, what I think is most interesting about this course is the flow of electrons in these incredibly small structures. The first transistors were made with gaps between the source and the drain, or channels, that were 10,000 nanometers long. My first job was working on 5,000 nanometer technology. Today's technology is 20 nanometers. We're talking already about five nanometer technology. So the dimensions of these transistors have shrunk to incredibly small sizes. This has forced us to rethink our understanding about how electrons flow in these very small structures. Now, there was a good deal of fundamental scientific work that went on in the last decade or so of the 20th century where scientists produced very small structures and learned how to understand current flow at the nano and molecular scale. We had to do things like rethink what Ohm's law means at the nano scale. The result of this work was a new understanding of electron flow in very small structures, a very simple, elegant, and physically sound way to think about current flow at the smallest dimensions. And it is time, now, to bring that new insight, and understanding, and ways of thinking to this very practical and important device. So this is a course that is designed both for people who know something about transistors and for people who are new to transistors. The first half of the course reviews some fundamentals and some concepts that haven't changed a lot but that continue to be very important. The really unique part of the class is the second half, where we bring these new ways of thinking about current flow in nanostructures to this very important device. So it's an opportunity to see how some fascinating nanophysics plays out in the context of a very practical and very important device. So if you're interested in learning more, I hope to see you in the course. I'll look forward to seeing you there. Thank you.
B1 US flow drain device transistor nanometer nano Nanotechnology: Fundamentals of Nanotransistors | PurdueX on edX | Course About Video 50 6 Li-Cheng Jheng posted on 2016/12/08 More Share Save Report Video vocabulary