Photolithography
![Mask alignment during thin film fabrication Mask alignment during thin film fabrication](https://www.yourthinfilmsource.com/wp-content/uploads/2017/03/DSC_1155.jpg)
Photolithography is the process of using light to transfer images from a photomask to a coated thin film substrate. The key to the process is the use of a light-sensitive chemical called photoresist and a precision phototool, called a photomask. The photomask is custom tooling made from customer CAD files.