How do electronic materials process signals in computers and communications systems?

In materials science, computers and communications systems process information by manipulating signals represented as moving electrons or photons.1

Electronic systems rely on semiconductors—crystalline solids with electrical conductivity between that of a conductor and an insulator—to create, transmit, and process these signals. Key components include:21

• Transistors: These act as the fundamental building blocks for switching and amplification. As switches, they efficiently control current flow, enabling the binary logic required for computing. As amplifiers, they produce larger output signals that replicate input signals.3
• Integrated Circuits: Semiconductors are integrated into complex microelectronic circuits, which provide the compactness and power efficiency necessary for modern signal processing.2
• Interconnections: Materials such as copper wiring, metalized films, and various substrates facilitate the movement of electrons between these components.1

While electronics dominate internal processing, photonic materials (such as silica glass for optical fibers) are increasingly used for transmission. Systems often bridge these domains using optoelectronic devices, which convert data between electronic and optical forms to leverage the high-speed advantages of light.145