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Mask Alignment and Exposure
One of the most significant steps in the photolithography process is mask alignment. A mask or "photomask" is a square glass plate with a patterned emulsion of metal film on single side. The mask is aligned with the wafer, so that the pattern can be transfer onto the wafer surface. Every mask after the first one must be aligned to the last pattern.
Once the mask has been accurately allied with the pattern on the wafer's surface, the photo resist is exposed by the pattern on the mask with a high intensity ultraviolet light. There are three primary exposure methods: contact, proximity, and projection. They are shown in the figure below.
THRMODYNAMICS
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Diffusion: Molecular diffusion, often known as simply diffusion, is a net transport of molecules from a region of higher concentration to one of lower concentration by chance mole
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30,000 lb/hr of combination whose average properties correspond to hexane is vaporized from 40,000 lb/hr of feed at its bubble point at 105 psig. The boiling range is from 300 to 3
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merits and demerits of free radical
1. Wastewater leaving the ACME cheese factory must be neutralized to a pH between 6.8 and 7.2. Citric acid is available to decrease pH and sodium hydroxide is used to increase pH.
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