Explain mask alignment and exposure, Chemical Engineering

Assignment Help:

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.  

 

2123_Untitled.png


Related Discussions:- Explain mask alignment and exposure

Concentration gradient , Mass transfer coefficients can be of either local ...

Mass transfer coefficients can be of either local or overall type. a. Describe carefully what the local and overall mass move coefficients show. b. How does the concentration

Project design , can you do my assignment as the deadline is sunday night?

can you do my assignment as the deadline is sunday night?

Water softening, What is phosphate conditioning in water softening?

What is phosphate conditioning in water softening?

Objectives of study of design and infrastructure , Objectives After doi...

Objectives After doing this exercise you should be able to: 1. Describe the features of the preparation room of the lab you have visited, 2. Examine and evaluate a prepar

Material balance, Strawberries contain about 20 wt% solids and 80 wt% water...

Strawberries contain about 20 wt% solids and 80 wt% water. To make strawberry jam, crushed strawberries and sugar are mixed in a 40:60 mass ratio, and the mixture is heated to evap

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd