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

Explain hard magnetic materials, Hard magnetic materials   Permanent ma...

Hard magnetic materials   Permanent magnets are used as passive generators of magnetic field. To produce and maintain the magnetic field, a material should have both high resid

Assuming a factor of safety , A large tower is to be supported by a series ...

A large tower is to be supported by a series of steel wires; it is estimated that the load on every wire will be 13,300 N (3000 lbf). Verify the minimum needed wire diameter, assum

Different types of polarization mechanisms in dielectrics, Explain the diff...

Explain the different types of polarization mechanisms in dielectrics. There are essentially four basic kinds of polarization mechanisms: Interface polarization: Electron

Calculate the pressure and composition of the vapor phase, For the binary s...

For the binary system 2, 4-dimethylpentane (1) + benzene (2) the excess Gibbs energy of the liquid phase is given by: G E /(x 1 x 2 ) = (A 12 x 1 + A 21 x 2 ) a. Calculate t

Estimate the hourly emissions - source emission factors, A contaminated soi...

A contaminated soil contains 100 mg metals/kg soil (all metals are readily condensable), 50,000 mg S/kg soil, 1,000 mg F/kg soil, 980 mg/Kg of VOCs and 40,000 mg Cl/kg soil and is

.paint production, what is the effect of surfactant in paint

what is the effect of surfactant in paint

Placement of order with the firm , PLACEMENT OF ORDER WITH THE FIRM FOR THE...

PLACEMENT OF ORDER WITH THE FIRM FOR THE SUPPLY OF GOODS A format of an order form is given below. You are required to fill it for the supply of the following equipments from

A bugs life, Whats the lifetime of a bugg?

Whats the lifetime of a bugg?

Iron and steel, how do i stop flaring of iron and steel emission

how do i stop flaring of iron and steel emission

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