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

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.

Look, nerve cell reproduces

nerve cell reproduces

FLOODING AND CHANNELING, a. Explain the problems of flooding and channeling...

a. Explain the problems of flooding and channeling in packed tower

Outlet water temperature, A shell-and-tube Heat exchanger with one shell ex...

A shell-and-tube Heat exchanger with one shell exceed and two tube passes si to be designed to condense 3900 kg/hr of steam at 1 atm. Steam may be suppose to enter the shell side a

PROCESS CONTROL, HOW CAN I BE ABLE TO CONTROL AND BALANCE THE INPUT AND OUT...

HOW CAN I BE ABLE TO CONTROL AND BALANCE THE INPUT AND OUT-PUT

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

Determine the molar flow rates, Cyclohexane (C 6 H 12 ) is produced by mixi...

Cyclohexane (C 6 H 12 ) is produced by mixing Benzene and hydrogen. A process including a reactor, separator, and recycle stream is used to produce Cyclohexane. The fresh feed cont

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