lithography

A critical semiconductor manufacturing process that uses light to print microchip patterns onto silicon wafers.

Lithography is a foundational process in semiconductor manufacturing that uses light to project and print intricate circuit designs onto silicon wafers. The process begins by coating a wafer with a light-sensitive chemical called a photoresist. Light is then projected through a photomask—which acts as a stencil of the circuit design—and onto the wafer, chemically altering the exposed areas. These areas are subsequently etched away to leave behind the microscopic physical pathways that form a microchip. As the technology industry demands smaller, faster, and more power-efficient chips, lithography has become the primary technical bottleneck in semiconductor fabrication. Advanced techniques, such as Extreme Ultraviolet (EUV) lithography, utilize incredibly short wavelengths of light to print features measuring just a few nanometers. Because of the extreme physics involved, the machines required to perform advanced lithography are among the most complex and expensive pieces of industrial equipment on Earth. For technology and semiconductor investors, lithography is a critical indicator of industry health and capital expenditure cycles. The market for lithography equipment is highly consolidated, with a single or very few companies controlling the supply of advanced machines. This extreme consolidation grants these equipment manufacturers immense pricing power, high backlogs, and wide economic moats, making them key bellwethers for the global hardware, cloud computing, and artificial intelligence markets.

A semiconductor foundry purchases an Extreme Ultraviolet (EUV) lithography system for $200,000,000. If the machine runs continuously and processes 150 silicon wafers per hour, the depreciation cost of the machine alone over a 5-year useful life (assuming 8,000 operating hours per year) is calculated as: $200,000,000 / (5 years 8,000 hours) = $5,000 per hour. At 150 wafers per hour, this equates to $5,000 / 150 = $33.33 in lithography depreciation cost per wafer.