How are semiconductor devices used in computer chips, optical sensors, and light-emitting diodes?

Semiconductor devices are essential components in modern electronics due to their reliability, compactness, and ability to be integrated into complex circuits. They function by utilizing materials with electrical conductivity between that of a conductor and an insulator, a property that can be precisely controlled through chemical treatment or temperature changes.1234

Computer Chips

In computer chips, semiconductors—primarily silicon—are used to manufacture millions of microscopic transistors on a single small chip. These transistors serve as the fundamental building blocks for control and memory functions, enabling the processing power found in computers, smartphones, and other electronic systems.342

Optical Sensors

Semiconductor-based photodiodes and photoconductive cells act as optical sensors by converting light into electrical energy or signals. These devices are sensitive to light intensity and are used in applications ranging from industrial process control and pollution monitoring to fibre optics and imaging technology.5

Light-Emitting Diodes (LEDs)

Light-emitting diodes (LEDs) utilize compound semiconductors, such as gallium arsenide, to emit radiation when forward-biased. As electrons move across the junction and drop into holes, they release energy in the form of light. These are widely used for indicators, displays, and, in the form of semiconductor lasers, for high-speed data transmission in telecommunications.62