Explain contact printing, Chemical Engineering

Assignment Help:

Contact Printing

In contact printing, the resist-coated silicon wafer is bring into physical contact with the glass photo mask. The wafer is held on a vacuum chuck, and the entire assembly rises until the wafer and mask contact each other. The photoresist is exposed with UV light while the wafer is in contact position with the mask. Because of the contact among the resist and mask, very high resolution is possible in contact printing (e.g. 1-micron features in 0.5 microns of positive resist). The problem with contact printing is that debris, trapped among the resist and the mask, can damage the mask and cause defects in the pattern.

 


Related Discussions:- Explain contact printing

Free electron theory of metals, Free Electron theory of metals This the...

Free Electron theory of metals This theory tells that, metals conduct electricity due to the presence of free electrons in it. The outermost shells of metal atoms will be loose

Can alsocoholic acidity of Maida be estimated in 1 hour, Is there any metho...

Is there any method fro estimation of alcoholic acidity of maida less than 24 Hrs.

Hazop and hazan , write hazop study to dethanizer column and brief hazan ...

write hazop study to dethanizer column and brief hazan write brief hazan for shell and tub will send PID for both if you agree do this

Processing of bill for payment, PROCESSING OF BILL FOR PAYMENT : Your Coun...

PROCESSING OF BILL FOR PAYMENT : Your Counsellor will give you one bill. In that bill, you make relevant entries of the following statement using your imagination.

Water vapour coexist in equilibrium, The degree of freedom when ice water a...

The degree of freedom when ice water and water vapour coexist in equilibrium is zero

.electronic configuration , #question.Q1 What is wrong with each of the fol...

#question.Q1 What is wrong with each of the following attempts to write an electron configuration? Justify your answer with suitable explanation. (a) 1s22s3 (b) 1s22s22p23s2 (c) 1s

Gas law, a) The vacuum in the headspace of a can of food is normally forme...

a) The vacuum in the headspace of a can of food is normally formed by "hot fill" exhausting - that is, the cans are closed when the can is filled with product at a temperature o

Atmospheric carbon dioxide, Atmospheric carbon dioxide is thought to be res...

Atmospheric carbon dioxide is thought to be responsible for global warming. The table below contains data about the amount of Atmospheric CO 2 (in ppm) over the last fifty year

Report of handling of hazardous, Report Note: What do you observe? Do...

Report Note: What do you observe? Do you realise that the common chemicals you have been hadling casually at your laboratory (if any, with which you are working) are quite

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