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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits1 Mark
MCQ
The battery connections required to forward bias a $pn$ junction are $.........$
  • ✓
    $+ve$ terminal to $p$ and $-ve$ terminal to $n$
  • B
    $-ve$ terminal to $p$ and $+ve$ terminal to $n$
  • C
    $-ve$ terminal to $p$ and $-ve$ terminal to $n$
  • D
    None of these
✓

Answer

Correct option: A.
$+ve$ terminal to $p$ and $-ve$ terminal to $n$
To forward bias the $p-n$ junction, the $p$ side is made more positive, so that it is "downhill" for electron motion across the junction. An electron can move across the junction and fill a vacancy or "hole" near the junction. It can then move from vacancy to vacancy leftward toward the positive terminal, which could be described as the hole moving right. The conduction direction for electrons in the diagram is right to left, and the upward direction represents increasing electron energy.

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