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5 marksThe p-n Junction Diode

CAPE Physics Unit 2 · 2017 · Paper 2 · Question 5(b)

With the aid of diagrams, describe how a depletion layer forms at an unbiased p-n junction, specifying the conditions under which its formation begins and ceases.

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Other parts of this question

  1. 5(a)Explain what is meant by a 'semiconductor' and state typical values for its resistivity.[3 marks]
  2. 5(c)(i)Deduce the value of the output voltage V_out when V_in = 0.5 V.[1 mark]
  3. 5(c)(ii)Explain your answer to part (c)(i).[2 marks]
  4. 5(c)(iii)Deduce the value of the output voltage and the diode current when V_in = 2.0 V.[1 mark]
  5. 5(c)(iv)Explain the answer given in part (c)(iii).[3 marks]

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