Nanotechnology in Electronics

Modern computer chips are built with features measured in nanometers. The transistors in a 2024-era smartphone processor have channels just a few atoms wide. Moore is Law, named for Intel cofounder Gordon Moore, observed that the number of transistors on a chip roughly doubles every two years. This pace of miniaturization has continued for over 50 years through relentless improvements in nanofabrication. Each new node (5 nanometer, 3 nanometer, 2 nanometer) requires advanced lithography (especially extreme ultraviolet, or EUV) and dozens of innovations in materials and device structures to keep working at those scales.

At smaller scales, quantum effects increasingly matter. Electrons can tunnel through barriers that are too thin, leaking current and wasting power. Engineers have responded with new transistor designs (FinFETs, gate-all-around transistors), new materials (high-k dielectrics, copper interconnects), and new architectures (3D-stacked chips, chiplets). Beyond traditional silicon, researchers are exploring carbon nanotubes, graphene, and 2D materials like molybdenum disulfide for future transistors. Each new generation costs billions of dollars to develop and requires factories that are themselves engineering marvels.

Beyond CPUs and memory, nanoelectronics powers many other technologies. Modern displays use organic LEDs (OLEDs) with nanometer-thin emissive layers. Solar cells use thin-film semiconductor structures to convert sunlight more efficiently. Sensors in phones, cars, and medical devices increasingly rely on nanoscale microelectromechanical systems (MEMS). The internet of things, with billions of small connected devices, depends on cheap, low-power chips made with advanced nanofabrication. Each application illustrates how nanotechnology has become foundational infrastructure for modern digital civilization.

Nanoelectronics is the hidden infrastructure underneath every digital device you use. The next lesson covers the energy applications of nanotechnology: from better solar cells to next-generation batteries.