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

Fraction, what is the mole fraction of solute and solvent is equal to

what is the mole fraction of solute and solvent is equal to

Semiconductor device applications, Semiconductor device applications A...

Semiconductor device applications All transistor types can be used as the building blocks of logic gates, which are fundamental in the design of digital circuits. In digital c

Bernoulli equations, air flows through apipe at arte of 200L/S. The pipe of...

air flows through apipe at arte of 200L/S. The pipe of two sections of diameters 20cm and 10cm with asmoth reducing section the pressure are difference between the two pipe sectio

Monolith reactor, Your first assessment will cover the design of a monolith...

Your first assessment will cover the design of a monolith reactor for the VOCs removal. Therefore, you are asked to do the following: 1. Choose a specific VOC; 2. Search for the

Bioreactor design calculation questions, I need help with solving Bioreacto...

I need help with solving Bioreactor design calculation questions.eg Batch, CSTR, Fed Batch, Plug Flow Bioreactors. Is this within your scope of work.

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

Functions of a lubricant and types of lubrication, Q.  What are the functi...

Q.  What are the functions of a lubricant? Describe the various types of lubrication.                                            OR Discuss the types of mechanism of lub

Process control, A tank contains cold water at a temperature Tc = 20°C and ...

A tank contains cold water at a temperature Tc = 20°C and volume Vc = 1 m3. You add a volume Vh = 1 m3 of water at temperature Th = 100°C at time t = 0. Energy is lost from the tan

Homes, Ask questionbats #Minimum 100 words accepted#

Ask questionbats #Minimum 100 words accepted#

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