Silicon wafers

Which method irradiates FZ silicon with neutrons to convert some silicon into phosphorus, making it uniformly n-type?

  1. ANeutron transmutation doping (NTD)
  2. BIon implantation
  3. CThermal diffusion
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Answer: A. Neutron transmutation doping (NTD)

When silicon is irradiated with neutrons, some silicon (Si-30) absorbs a neutron to become Si-31, which decays into phosphorus. Phosphorus forms uniformly throughout the crystal, giving n-type wafers with very little resistivity variation, used for high-voltage power devices.

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More Silicon wafers questions

  1. Which method applies a magnetic field to the crucible in the CZ method to suppress melt convection and control oxygen concentration and other properties?
  2. Which conditions are mainly adjusted during pulling to keep the diameter of a silicon single-crystal ingot constant?
  3. Which is one reason SiC wafers are difficult and expensive to manufacture?
  4. Roughly what size in inches is a silicon wafer 300 mm in diameter commonly called?
  5. What is the cylindrical block of single-crystal silicon grown by the CZ method or similar, before it is cut into wafers, called?