DRAM

Why are high-k materials such as zirconium oxide used for the dielectric film of DRAM capacitors?

  1. ATo secure the necessary capacitance in a small area
  2. BTo reduce wiring resistance
  3. CTo make the capacitor emit light
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Answer: A. To secure the necessary capacitance in a small area

Capacitance is proportional to permittivity. Even as cells shrink, a certain capacitance is needed to read data correctly, so high-k materials such as ZrO2, with higher permittivity than SiO2, are used to obtain the needed capacitance in a small area.

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