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

Surveying and geoinformatics, relevance of surveying and geoinformatics to ...

relevance of surveying and geoinformatics to chemical engineering

Properties of good refractory material, Properties of good refractory mater...

Properties of good refractory material: The requirements of refractories for different furnaces and heating places depend on the working conditions. Nature of slag formed, maximum

Explain ion implantation, Ion implantation equipment typically having of a...

Ion implantation equipment typically having of an ion source, where ions of the desired element are produced, an accelerator, where the ions are electrostatically accelerated to a

Chemistry, application problems on electrochemical series

application problems on electrochemical series

Phosphate conditioning, internal treatment with reference to phosphate cond...

internal treatment with reference to phosphate conditioning

Introduction regular duties of laboratory staff, Introduction : You will r...

Introduction : You will recall previous study of this course about the various duties and activities of a lab staff that facilitate management of the laboratory in an efficient ma

Examine a molecular model of compound, Which one of the following statement...

Which one of the following statements is correct? You may wish to examine a molecular model of this compound. 1. Carbon G is an asymmetric center and its configuration is R 2

A ge atom, A Ge atom contains     Ge atom contains Four valence elect...

A Ge atom contains     Ge atom contains Four valence electrons

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