Which of the following statements is false regarding the...

Which of the following statements is false regarding the drift of charge carriers? (a) It is the dominant carrier transport mechanism when an electric field is applied in the semiconductor. (b) Holes move in the direction opposite to that of the applied field. (c) During drift, the carrier transport is characterized by their respective electron/hole mobilities. (d) During drift, electrons and holes move in opposite directions.

Which of the following statements is false regarding the drift of charge carriers?
(a) It is the dominant carrier transport mechanism when an electric field is applied in the semiconductor.
(b) Holes move in the direction opposite to that of the applied field.
(c) During drift, the carrier transport is characterized by their respective electron/hole mobilities.
(d) During drift, electrons and holes move in opposite directions.

Key Concepts

Direction of Carrier Movement

In semiconductors, the direction in which charge carriers move under an electric field is determined by their charge. Electrons, which are negatively charged, move in the direction opposite to the field, while holes, being positive carriers, move in the same direction as the applied electric field. This fundamental understanding is crucial for analyzing device behavior.

Drift Current

Drift current refers to the motion of charge carriers, such as electrons and holes, in a semiconductor under the influence of an external electric field. It is the primary mechanism of carrier transport when an electric field is applied, as the field exerts a force on the carriers causing them to accelerate and move, thus resulting in an electrical current.

Electron/Hole Mobility

Electron and hole mobility are measures of how quickly the respective charge carriers can respond to an electric field. Mobility depends on factors such as scattering mechanisms and the semiconductor material properties, and it plays a crucial role in determining the efficiency and speed of the drift current in devices.

Carrier Transport Mechanisms

Carrier transport in semiconductors primarily occurs via drift, under the influence of an electric field, and diffusion, due to concentration gradients. Drift is typically the dominant transport mechanism when an external field is applied, as it directly propels carriers along the field lines, whereas diffusion relies on the random thermal motion of carriers.

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