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 soft magnetic materials, Soft magnetic materials  Soft magnetic...

Soft magnetic materials  Soft magnetic materials are majorly utilized in those applications in which the soft material has to amplify the flux occured by the electrical current

Assignment, can you help with process control questions

can you help with process control questions

Explain covalent bond, Explain covalent bond A covalent bond is a fo...

Explain covalent bond A covalent bond is a form of chemical bonding that is characterized by the sharing of pairs of electrons among atoms, or among atoms and other covalent

Water and Wastewater Treatment, this is my assignment '' Disinfection of wa...

this is my assignment '' Disinfection of water streams originating from potable water plants is key in protecting environmental health. Describe the process design and application,

What do you understand by wet bulb globe temperature, What do you understan...

What do you understand by Wet bulb Globe temperature? Wet bulb globe temperature index is used to measure the sultriness of environment. Sultriness is calculated on the basis o

Introduction-design and organisation of laboratory store, INTRODUCTION : Y...

INTRODUCTION : You have studied of LT-1 course that storage is usually a necessity in most scientific establishments. You know that sufficient and appropriate storage space should

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

Material and energy balance, I have weekly test and online homework. how mu...

I have weekly test and online homework. how much is it to solve one question and do you help with online assignment

Characteristics of ferro-electric materials, What are the chief characteris...

What are the chief characteristics of ferro-electric materials Ferroelectric materials have following characteristics: a)  They have a huge dielectric constant which is non-

Water softening, What is phosphate conditioning in water softening?

What is phosphate conditioning in water softening?

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