How patterned light, masks and chemistry create microscopic structures on semiconductor wafers.
What is semiconductor lithography?
Lithography is the process of transferring a pattern onto a semiconductor wafer.
In photolithography, a wafer is coated with photoresist, exposed through a mask or reticle, developed and then etched or otherwise processed.
Why is it important?
Lithography defines the size, shape and alignment of features that become transistors, wires, contacts and other structures.
Smaller and more accurately aligned patterns can increase density and improve performance, but only when materials, optics, defects and heat remain controllable.
A short history
Early integrated circuits used relatively large features and optical methods. Repeated improvements in resists, lenses, alignment and process control enabled modern chips.
Deep ultraviolet and extreme ultraviolet systems extend the usable resolution of optical projection.
Limits and future
Lithography is constrained by wavelength, optics, focus, vibration, defects, cost and materials. It is one part of a much larger manufacturing sequence.
The field is strategically important because a small number of specialized tools and suppliers support much of advanced chip production.
Ai disclosure: written with the help of AI (ChatGPT). You are encouraged to point out errors and omissions.
