Q2(b). Increasing silicon conductivity
The conductivity of silicon semiconductor is small compared to metals. Propose two methods to increase the conductivity of silicon, with examples. Draw the energy level diagrams illustrating the two methods.
Answer in brief
Dope Si with a group 15 donor such as P to obtain n-type material, or a group 13 acceptor such as B to obtain p-type material.
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Coversn-type semiconductorp-type semiconductordoping silicondonor acceptor levelsband theory
All parts of Question 2
- 2(a) Two perovskite unit-cell origins10 marks
- 2(b) Increasing silicon conductivity10 marks
- 2(c) Fullerite basis and ammonolysis4 marks
- 2(d) Defects and solid-state properties6 marks