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

Leak test in hydrocracking plant, how to perform a leak test with nitrogen ...

how to perform a leak test with nitrogen in a hydrocracking plant in Russia

Question from midterm, A mixture of calcium sulfate (CaSO4) and calcium ura...

A mixture of calcium sulfate (CaSO4) and calcium uranate (CaUO4) contains 10% sulfur by mass. What is the mass percentage of uranium in the mixture?

Mass transfer, Explain the problems of flooding and channeling in packed to...

Explain the problems of flooding and channeling in packed tower

Problems of flooding and channeling and mass transfer, 1. Mass transfer coe...

1. Mass transfer coefficients can be of either local or overall type. a. Explain carefully what the local and overall mass transfer coefficients represent. b. How does the co

Assuming a factor of safety , A large tower is to be supported by a series ...

A large tower is to be supported by a series of steel wires; it is estimated that the load on every wire will be 13,300 N (3000 lbf). Verify the minimum needed wire diameter, assum

Linear alkyl benzene, Linear Alkyl benzene (LAB) is produced by the alkylat...

Linear Alkyl benzene (LAB) is produced by the alkylation of benzene with olefins (assuming all dodecane). Raw maw materials: Kerosene and benzene. The chemical plant design comp

Requirment for study design and features of laboratory, REQUIREMENTS Wo...

REQUIREMENTS Workbook cum Lab. manual Block 1 (LT-1 course) Pencil Pen Eraser Scale Coloured pens

Explain oxidation, Oxidation - Silicon has the unique ability to be oxidiz...

Oxidation - Silicon has the unique ability to be oxidized into silica, which produces a chemically stable, protective and insulating layer  on the surface of the wafer. The produc

Assignment, can you help with process control questions

can you help with process control questions

¿, miunuman t Boston party

miunuman t Boston party

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