Advanced Semiconductor Manufacturing Techniques
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Questions and Answers

Why is low pressure needed for PVD (physical vapor deposition) and CVD (chemical vapor deposition) thin layer deposition techniques?

  • To improve the uniformity of the deposited layers (correct)
  • To increase the adhesion of the deposited layers
  • To enhance the temperature control during deposition
  • To prevent unwanted chemical reactions
  • What is the main role of plasma in the CVD (Chemical Vapor Deposition) processes?

  • Triggering a chemical reaction to deposit a thin film on the substrate (correct)
  • Acting as a cleaning agent before deposition
  • Enhancing adhesion between the film and the substrate
  • Increasing the temperature to facilitate deposition
  • In lithography, how does the Depth of Focus (DOF) vary with the wavelength (λ)?

  • DOF increases with increasing wavelength (correct)
  • DOF varies inversely with wavelength
  • DOF is independent of wavelength
  • DOF decreases with increasing wavelength
  • What is the main difference between dry etch and wet etch?

    <p>Dry etch uses gases to remove material while wet etch uses liquid chemicals</p> Signup and view all the answers

    Define step coverage and what are the challenges in various deposition techniques?

    <p>Step coverage refers to the even coating of a raised feature with a thin film; challenges include void formation and non-uniform thickness</p> Signup and view all the answers

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