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Chapter 1: Problem 28

When a tiode is forward-biased, (a) the only current is hole curnent (b) the only current is electron current (c) the only carrent is produced by magority carriens (d) the current is produced by both holes and electrons

Short Answer

Expert verified
In a forward-biased diode, the current is produced by both holes and electrons, as both types of charge carriers contribute to the overall current flow. The correct answer is (d) the current is produced by both holes and electrons.

Step by step solution

01

Understand forward-biased diode

A diode is forward-biased when the p-type semiconductor is connected to the positive terminal and the n-type semiconductor is connected to the negative terminal of the power supply. In this condition, the junction barrier decreases allowing current to flow through the diode.
02

Hole current and electron current

In a semiconductor, there are two types of charge carriers: holes and electrons. Holes are the absence of electrons and contribute to the hole current in the material, while the electrons contribute to the electron current. In a semiconductor diode, both hole and electron currents contribute to the overall current flow.
03

Majority carriers

Majority carriers refer to the dominant type of charge carriers in a particular semiconductor material. For p-type semiconductors, majority carriers are holes and for n-type semiconductors, majority carriers are electrons.
04

Determine the current flow in a forward-biased diode

Since we know that a forward-biased diode allows current to flow due to the decrease in the junction barrier and the current is contributed by both holes and electrons, the correct statement about the current flow in the diode will be: (d) the current is produced by both holes and electrons

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