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

Phenomenon of polarization in dielectric materials, Explain the phenomenon ...

Explain the phenomenon of polarization in dielectric materials. Polarization in Dielectric Materials: If a material contains polar molecules, they will usually be in rando

Hysys, Could help with Hysys design assinment?

Could help with Hysys design assinment?

Effluent treatment, how to reduce COD in primary process effluent treatment...

how to reduce COD in primary process effluent treatment system

Rheology, why do frosting on cakes do not fall off

why do frosting on cakes do not fall off

Fluid mechanics, Your favorite professor likes mountain climbing, so there ...

Your favorite professor likes mountain climbing, so there is always a possibility that the professor may fall into a crevasse in some glacier. If that happened today, and the profe

#titleHardness of Water, Ask question #Minimum 100 words accepted.hardness ...

Ask question #Minimum 100 words accepted.hardness of bore water is less than that of sea water-justify

Determining whether a given compound is pure or not, if you were given an u...

if you were given an unknown substance, how would you determine if it is a pure compound?

Smelting furnaces, complete process of reverberetoy furnace?

complete process of reverberetoy furnace?

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