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Electronic Devices and Circuits

Q1:

Consider the following statements.
  1. Etching
  2. Exposure to UV radiation
  3. Stripping
  4. Developing
After a wafer has been coated with photo resist the correct sequence of these steps in photolithography is

A 2, 4, 3, 1

B 2, 4, 1, 3

C 4, 2, 1, 3

D 3, 2, 3, 1

ANS:C - 4, 2, 1, 3

Shouldn't it be Exposure to radiation first to allow marking of the design followed by developing?

(2, 4, 1, 3) ?



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