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

Review paper in biochar regeneration, I need an expert in Biochar who can h...

I need an expert in Biochar who can help me to write a review paper and a research paper then help me in publishing it in SCI journal the I pay him or her!

Explain the polarization of dielectric, Polarization of Dielectric If a...

Polarization of Dielectric If a material having polar molecules, they will usually be in random orientations when no electric field is applied. An applied electric field will p

Water technology, whycoagulant is not used in hot lime soda proces

whycoagulant is not used in hot lime soda proces

Compute the kerosene - water ratio to remove nicotin, Compute the kerosene/...

Compute the kerosene/water ratio necessary to remove 90 % of the nicotine from the aqueous stream in a single equilibrium stage.

Look, nerve cell reproduces

nerve cell reproduces

Edta method, structure of EDTA and estimation of hardness of water by Edta ...

structure of EDTA and estimation of hardness of water by Edta method

Mass transfer operation, a. Explain the problems of flooding and channeling...

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

Process Control, An operator tells you that it takes 2 minutes for a proces...

An operator tells you that it takes 2 minutes for a process to get half way to the final value after a step change in the input. What can you infer about the process time constant

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