Semiconductors have ______ conduction band and ______ valence band.

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SSC JE EE Previous Paper 12 (Held on: 24 March 2021 Evening)
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  1. A lightly filled; a moderately filled
  2. an almost filled; a moderately filled
  3. an almost empty; an almost filled
  4. an almost filled; an almost empty

Answer (Detailed Solution Below)

Option 3 : an almost empty; an almost filled
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Property of Semiconductors:

  • Semiconductors are the materials that have a conductivity between conductors (generally metals) and non-conductors or insulators (such as ceramics).
  • Semiconductors can be compounds such as gallium arsenide or pure elements, such as germanium or silicon.
  • Semiconductors have an almost empty conduction band and an almost filled valence band.
  • In a semiconductor, the mobility of electrons is higher than that of the holes.
  • Its Resistivity lies between 10-5 to 106 Ωm
  • Conductivity lies between 105 to 10-6 mho/m
  • The temperature coefficient of resistance for semiconductors is Negative.
  • The current Flow in the semiconductor is mainly due to both electrons and holes.
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