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

Explain the fermi energy, Explain the Fermi energy The Fermi energy g...

Explain the Fermi energy The Fermi energy generally refers to the energy of the highest get quantum state in a system of fermions at absolute zero temperature.

Introduction-study of design and infrastructure , INTRODUCTION : This exer...

INTRODUCTION : This exercise is based on here of this course where you were introduced to For Mode-1 Students the essential features of a good preparation room that offers service

Look, nerve cell reproduces

nerve cell reproduces

Name of some common conducting materials, The various common conducting mat...

The various common conducting materials used are: 1)  Copper 2)  Aluminium 3) Tungsten

Specific consumption to produce DMAPA, Reactants Acrylonitrile and Dimethyl...

Reactants Acrylonitrile and Dimethylamine to form product DMAPA i.e. Dimethylaminopropylamine. What is the specific consumption of reactants to produce 1mole of DMAPA

Chemical bonding, Why protons doesn''t react which each other?

Why protons doesn''t react which each other?

Prior preparation for fixing and staining animal tissue, Prior preparation ...

Prior preparation for fixing and staining animal tissue and/or plant tissues: Find out what procedure the lab technician follows for preparing fixative (either plant andor animal)

Chlorination, importance of chlorination in water

importance of chlorination in water

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