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1 markThe p-n Junction Diode

CAPE Physics Unit 2 · 2010 · Paper 2 · Question 2(b)(i)

The current I through a p-n junction diode relates to voltage V by I = I₀ exp(eV / nkT). DC measurements at 300 K are recorded in Table 2.

Complete Table 2 by filling in the missing values of ln(I / μA).

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Other parts of this question

  1. 2(a)(i)a)Explain what is meant by P-type material.[1 mark]
  2. 2(a)(i)b)Explain what is meant by N-type material.[1 mark]
  3. 2(a)(i)c)Explain what is meant by the depletion region.[1 mark]
  4. 2(a)(ii)Draw a diagram of a junction transistor and draw the transistor symbol.[2 marks]
  5. 2(b)(ii)Plot a graph of ln I versus V on the grid opposite and draw your best straight line through the points.[4 marks]
  6. 2(b)(iii)Write the equation relating ln I and V.[1 mark]
  7. 2(b)(iv)Determine the ideality factor n using data: k = 1.38 × 10⁻²³ J K⁻¹ and elementary charge e = 1.60 × 10⁻¹⁹ C at T = 300 K.[4 marks]

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