Which type of charge carriers mainly control current in a Field Effect Transistor (FET)?
Majority carriers only
To determine the type of charge carriers that mainly control current in a Field Effect Transistor (FET), we need to understand how a FET operates.
A Field Effect Transistor is a type of transistor that regulates the flow of electrons (or holes) in a semiconductor channel using an electric field. There are two main types of FETs:
- Junction FET (JFET)
- Metal-Oxide-Semiconductor FET (MOSFET)
In both JFETs and MOSFETs, the operation is primarily carried out by the majority charge carriers:
- N-channel FET: Here, electrons are the majority carriers.
- P-channel FET: Here, holes are the majority carriers.
The FET operates by controlling the width of the channel through which the majority carriers flow, thereby controlling the current. This is achieved by applying a voltage to the gate, which modulates the conductivity of the channel.
Now, let's analyze the provided options to determine the correct one:
- Electrons and holes together: This is not correct because FET operation is primarily controlled by one type of charge carrier, either electrons or holes, but not both simultaneously.
- Minority carriers only: This is incorrect as FETs predominantly rely on majority carriers to conduct current.
- Both minority and majority carriers: This is incorrect as FET operation does not involve both types at the same time.
- Majority carriers only: This is the correct answer because FET operation hinges on the flow of majority carriers within the channel.
Therefore, the correct answer is Majority carriers only.
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