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

Design of absorption column, i am doing project on design of absorption col...

i am doing project on design of absorption column for the removal of n204 from atmospheric air..please help me

introduction on physiological pharmacokinetics, Question : Give a basic in...

Question : Give a basic introduction on PHYSIOLOGICAL PHARMACOKINETICS ? Answer: The history and bases of physiological pharmacokinetics will be briefly reviewed, pointing out

Order of reaction, on doubling the concentration of reactant,the rate of re...

on doubling the concentration of reactant,the rate of reaction triples.what is the order of reaction?

Natural polymer, i need to make a small report on natural polymer

i need to make a small report on natural polymer

Material and energy balances, Wet air containing 4.0 mole% water vapor at 7...

Wet air containing 4.0 mole% water vapor at 76°F and 14.8 psia is passed through a column of calcium chloride pellets. The pellets absorb 97% of the water and none of the other con

Procedure in duties of laboratory staff, PROCEDURE : Visit any two labs of...

PROCEDURE : Visit any two labs of your choice (Botany/Zoology/Physics/Chemistry) of your study centre and consult the lab technician or senior laboratory supporting staff and com

find the entropy, For a substance explained by the van der Waals equation ...

For a substance explained by the van der Waals equation of state with a constant heat capacity CV : 1) Find the internal energy U(T, V ), relative to a reference state at some T

learn the handling of hazardous chemicals-fume cupboard, Activity to Learn...

Activity to Learn The Handling Of Hazardous Chemicals: Use Of Fume Cupboard Previous you learn about the importance of fume cupboard and its usage. There are many chemicals whi

Molarity, WHATS THE MOLARITY OF SEAWATER

WHATS THE MOLARITY OF SEAWATER

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