Defying Limits: World’s Smallest Transistor Reinforces Moore’s Law Once Again

In a breakthrough that teeters on the edge of the fantastical, researchers in the United States have just unveiled the world’s smallest transistor. As technological enthusiasts fully understand, the practical implications of such an achievement are immense, ushering in the possibility of increasingly efficient and faster-performing machines.

In the realm of computing, according to Moore’s Law—put forth by Gordon Moore, the esteemed American businessman and Chairman Emeritus of Intel Corporation—the computing world has, since 1965, been doubling the amount of transistors in a dense integrated circuit every two years. However, earlier this year, researchers from North Carolina State University threw speculated that 2014 might have marked the peak in terms of transistor size, following Stanford University’s innovation of a circuit model based on the human brain. This intricate device, known as “Neurocore”, consisted of sixteen chips simulating one million neurons and billions of synaptic connections and boasted an efficiency and speed 9,000 times greater than a common Personal Computer (PC).

However, this speculation has been recently rebutted, thanks to a team of researchers led by Ali Javey, Jeff Bokor, Chenming Hu, Moon Kim, and H.S. Philip Wong. This team claims to have overcome previous limitations, successfully creating a functional transistor as small as 1-nanometer. Previous belief held that transistors smaller than 5 nanometers would be unfeasible—making this landmark achievement even more extraordinary.

To understand the truly microscopic scale of the new transistor, consider this: the average human hair is approximately 80,000 nanometers wide, and a strand of human hair is typically about 50,000 nanometers thick. This new transistor is 50,000 times thinner.

The research team’s innovative approach involved substituting silicon—the material commonly used for building transistors—with carbon nanotubes and molybdenum disulphide. “Silicon transistors are approaching their size limit,” said Dr. Moon Kim, a professor of materials science and engineering at UT Dallas and one of the study’s authors. “Our research provides new insight into the feasibility to go beyond the ultimate scaling limit of silicon-based transistor technology.” The switch to molybdenum disulphide was made primarily due to its superior control over electron flow, even at incredibly small transistor sizes such as 1-nanometer.

Ali Javey, the leading principal investigator of the Electronic Materials program in Berkeley Lab’s, commented that “with the choice of proper materials, there is a lot more room to shrink our electronics”. As the announcement refers to a prototype, there are still several technical challenges to be addressed, including the integration of this small-scale transistor into a chip, before it can be mass-produced.

Despite the successful reinforcement of Moore’s law in 2021, there exists an understanding among scientists that this exponential growth cannot continue indefinitely. As Moore himself stated in 2005, “It can’t continue forever. The nature of exponentials is that you push them out and eventually disaster happens”. But that disaster hasn’t happened in 2021 and, if this latest breakthrough is any indication, it doesn’t look likely to happen in the immediate years to come.

To delve deeper into the details about the revolutionary nano-transistor prototype, you can read the full report published in the esteemed academic journal Science. This exciting development in nanotechnology underscores the fact that the boundaries of technological innovation are constantly being pushed—confirming, once again, the potent truth of Moore’s Law.