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Why is that a space charge region in a pn junction at equilibrium is often made small?
The space charge region in a pn junction at equilibrium is often made small due to:
- to obtain a high junction capacitance;
since the junction capacitance is inversely proportional to the width of the space charge region, the smaller the width, the larger the junction capacitance.
- to ensure easy diffusion of charge carriers;
if the space charge region is made small, that is, the width is made small, the distance for diffusion also becomes short, then it becomes easy for the electrons to diffuse into the p-side and the holes into the n-side
What else can I help you with?
What is the basic unit of charge?
The SI derived unit of electric charge is the coulomb(C).In electrical engineering, it is also common to use the ampere-hour (Ah).In chemistry and particle physics, it is common to use the elementary particle charge (e) as a unit.Independent of units, the symbol Q often denotes charge.
How depletion region across zener diode gets thin?
A diode is basically a PN junction device. P type semiconductors are rich in holes while N types are rich in electrons. (Rich means majority carriers here, which are found in the outer shell of atoms).Thus at the junction of this P and N type material, electrons and holes will combine resulting in a deficiency of charge carriers. This is termed the depletion region.When you attach the negative terminal of a battery to the N end of the diode and the positive terminal to the P end, the electrons will be repelled towards the junction and holes too will move towards the junction region, making it thin (narrow) (Further increase in voltage will make current to pass through). The opposite occurs when they are connected the other way. The region becomes thin.For normal operations, zener diodes are connected in reverse (diodes usually are connected reversely unless you want drop some voltage) the depletion layer widens, as described above. But at a certain reverse voltage, the zener starts to conduct suddenly. This is called avalanche/breakdown voltage. How the layer becomes thin (if at all, seems improbable) when they are reverse connected, I do not know.
How much should a plumber charge to install a kitchen faucet?
Depends on the situation, I would charge 1-2 hours for that, but other equipment can complicate the job. If there are garburators and water filters they often have to be removed and replaced.
What is the net charge on a n-type or a p-type substance?
There is no net charge on either substance. However, an N type substrate contains atoms (such as arsenic or phosphorous) trapped in its lattice that have an electron (called a donor electron) in the outer (valence) band of electrons, which can be easily removed by a relatively weak electromotive force (voltage). A P type substrate, although electrically neutral, contains an element (such as boron) which has one fewer electrons in its valence band that it would like to have, making it an acceptor. The missing electron is often called a "hole". To elaborate slightly, bands of electrons like to have a certain number of electrons to be "stable". A donor atom may have one, or perhaps five, electrons in its valence band, while an acceptor might have three or seven. Both would be happier with zero or four or eight. When an N and a P type substance are in contact, a negative voltage on the N material with respect to the P material will allow electrons to move from the donor material to the vacant holes in the acceptor. If the voltage is applied in reverse, the negative charge on the P material attracts the holes away from the junction, and the (relatively) positive charge on the N material attracts electrons away from the junction, and very little current flows.
Will an inverter charge a ups?
An inverter typically converts DC power from a battery into AC power for use with electrical devices, while a UPS (Uninterruptible Power Supply) is designed to provide backup power and often includes a built-in inverter. However, if you connect an inverter to a UPS, it may not charge the UPS's internal battery effectively, as UPS systems are designed to charge from AC mains power. Instead, a UPS usually requires a direct AC input to charge its batteries properly.
What is a groins?
the crease at the junction of the inner part of the thigh with the trunk together with the adjacent region and often including the external genitals
Neuromuscular junction is also known as the what?
The NMJ is the region where the efferent motor nerves connect with muscle tissue. When a signal is sent from the brain, down the spinal cord, to the nerve, neurotransmitters are released into the synaptic cleft (primary acetylcholine), which cause the muscle to contract.
What is cloud shape in chemistry?
This refers to the shape of the electron orbitals, which are often thought of as clouds of electronic charge.
What is the point of contact between a motor neuron and a skeletal muscle cell called?
This point is often called the neuromuscular junction or motor end plate. ?The neurotransmitter used here is acetylcholine.Many diseases occur with dysfunction at this junction, like Myesthenia Gravis, botulism, or Lambert Eaton Myasthenic Syndrome.
Gold is often diffused into silicon pn junction devices to?
Reduce the recombination rate
How often do use charge an ipod?
i often charge it once a week, but of course, it depends on how much you use it. if you use it for twenty four hours straight, then you will definitely need to charge it more often... :)
What kind of region would you expect to have the greatest relief?
The regions of greatest relief are often those near the active junction of two tectonic plates. This junction may be a subduction zone, such as in the major oceanic trenches such as the Marina Trench; or a collision zonesuch as near the Andes and the Himalayas.
How often do you charge your electric car?
Depends on how often you use it.
What is rachitic rosary?
Beadlike bumps present at the junction of the ribs with their cartilages--often seen in children with rickets.
What is region mean?
A region is an area often defined by boundaries or geography. For example, The northeast US is a region.
What is base width modulation?
As the applied base-collector voltage (VBC) varies, the base-collector depletion region varies in size. This variation causes the gain of the device to change, since the gain is related to the width of the effective base region. This effect is often called the "Early Effect"An NPN bipolar transistor can be considered as two diodes connected anode to anode. In normal operation, the emitter-base junction is forward biased and the base-collector junction is reverse biased. In an npn-type transistor for example, electrons from the emitter wander (or "diffuse") into the base
What is base-width modulation?
As the applied base-collector voltage (VBC) varies, the base-collector depletion region varies in size. This variation causes the gain of the device to change, since the gain is related to the width of the effective base region. This effect is often called the "Early Effect"An NPN bipolar transistor can be considered as two diodes connected anode to anode. In normal operation, the emitter-base junction is forward biased and the base-collector junction is reverse biased. In an npn-type transistor for example, electrons from the emitter wander (or "diffuse") into the base
