What is drift current and diffusion current?

Diffusion current = the movement caused by variation in the carrier concentration. Drift current = the movement caused by electric fields. Direction of the diffusion current depends on the slope of the carrier concentration. Direction of the drift current is always in the direction of the electric field.

What is drift current and diffusion current in semiconductor?

Hint: Drift current is the electric current due to the movement of charge carriers under the impact of an outer electric field, while diffusion current is the electric current due to the distribution of carriers, pointing to a change in carrier collection.

What is drift & diffusion current?

Drift current is the current flow in the diode due to the applied electric field. Diffusion current is the current due to the diffusion of the carriers because of the change in the carrier concentration.

What do you mean by diffusion current?

The diffusion current can be defined as the flow of charge carriers within a semiconductor travels from a higher concentration region to a lower concentration region. A higher concentration region is nothing but where the number of electrons present in the semiconductor.

What is the difference between current and drift current?

1. A massive, horizontal water flow of surface-ocean water as a broad stream in a definite direction is termed as ocean current. 1. A large volume of slow-moving ocean water is known as a drift.

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What is drift and diffusion current in semiconductor 12?

Solution. DRIFT CURRENT :- Drift current is the electric current, or movement of charge carriers, which is due to the applied electric field, often stated as the electromotive force over a given distance. DIFFUSION CURRENT:- Diffusion current is a current in a semiconductor caused by the diffusion of charge carriers.

What is drift current formula?

Drift Current Calculation :

The velocity achieved by the charge carriers due to the application of external voltage is referred to as Drift velocity. The drift velocity for the carrier concentration of electrons is. Vn = µ_nE.

What is a drift current in geography?

[′drift ‚kə·rənt] (oceanography) A wide, slow-moving ocean current principally caused by winds. Also known as drift; wind drift; wind-driven current.

What is called diffusion?

diffusion, process resulting from random motion of molecules by which there is a net flow of matter from a region of high concentration to a region of low concentration. A familiar example is the perfume of a flower that quickly permeates the still air of a room.

What is drift process in semiconductor?

Drift current can be defined as the charge carrier's moves in a semiconductor because of the electric field. There are two kinds of charge carriers in a semiconductor like holes and electrons.

What is diffusion current in semiconductor Class 12?

Answer. Diffusion current is a current in asemiconductor caused by thediffusion of charge carriers (holes and/or electrons). This is the currentwhich is due to the transport of charges occurring because of non-uniform concentration of charged particles in a semiconductor.

What is diffusion in pn junction?

As a result, the charge density of the P-type along the junction is filled with negatively charged acceptor ions ( N_A ), and the charge density of the N-type along the junction becomes positive. This charge transfer of electrons and holes across the PN junction is known as diffusion.

What is hole effect?

The Hall effect is when a magnetic field is applied at right angles to the current flow in a thin film where an electric field is generated, which is mutually perpendicular to the current and the magnetic field and which is directly proportional to the product of the current density and the magnetic induction.

What is diffusion semiconductor?

Abstract. Atomic diffusion in semiconductors refers to the migration of atoms, including host, dopant and impurities. Diffusion occurs in all thermodynamic phases, but the solid phase is the most important in semiconductors. There are two types of semiconductor solid phase: amorphous (including organic) and crystalline ...

What is n-type and p type semiconductor?

The majority carriers in a p-type semiconductor are holes. In an n-type semiconductor, pentavalent impurity from the V group is added to the pure semiconductor. Examples of pentavalent impurities are Arsenic, Antimony, Bismuth etc. The pentavalent impurities provide extra electrons and are termed as donor atoms.

What is biasing in semiconductor?

Advertisements. The term bias refers to the application of DC voltage to set up certain operating conditions. Or when an external source of energy is applied to a P-N junction it is called a bias voltage or simply biasing. This method either increases or decreases the barrier potential of the junction.

What are the 3 types of diffusion?

What is diffusion and osmosis?

In diffusion, particles move from an area of higher concentration to one of lower concentration until equilibrium is reached. In osmosis, a semipermeable membrane is present, so only the solvent molecules are free to move to equalize concentration.

What is called Brownian motion?

Brownian motion is the random, uncontrolled movement of particles in a fluid as they constantly collide with other molecules (Mitchell and Kogure, 2006).

What called cold currents?

A. When warm ocean waters move towards warmer regions it is called a cold ocean current. B. When warm ocean waters move towards cooler regions it is called a cold ocean current.

What is hot current and cold current?

They can be cold, warm, and hot. Warm ocean currents originate near the equator and move towards the poles or higher latitudes while cold currents originate near the poles or higher latitudes and move towards the tropics or lower latitudes.

What is the meaning of drift in physics?

Drift refers to the slow movement towards a thing/object. The average velocity of charged particles in a material due to an electric field is known as drift velocity.

What is drift voltage?

Drift is a variation in the output offset voltage. Often, it is temperature induced. Even if a circuit has been manually nulled, an output offset can be produced if the temperature changes. This is because VOS and IOS are temperature sensitive.

What force causes diffusion current?

Diffusion Current is a current in a semiconductor caused by the diffusion of charge carriers (holes and/or electrons). This is the current which is due to the transport of charges occurring because of non-uniform concentration of charged particles in a semiconductor.

What is the difference between drift and ocean currents?

The forward movement of surface water of the oceans under the influence of prevailing winds is called drift whereas the ocean current involves the movement of Oceanic water in a definite direction with greater velocity.