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What happens to the number of free electrons and holes in an intrinsic semiconductor when the temperature decreases?
increases
Is the current in intrinsic semiconductos du to fre electrons or valence electrons and what is the diff between them?
Well intrinsic semiconductor is semiconductor crystal with no impurities in it. In intrinsic semiconductor the electrons in valence band(valence electrons) gain energy(due to thermal enegry) and break free into conduction band(means it become free electrons). As this electron breaks free, a vacancy is created in place of it. It is called as a hole. This hole has a positive charge. So current in semiconductor is due to flow of this free electrons and holes. But this current is very small in magnitude. The difference between free electrons and valenece electrons is that valence electrons are often bonded to other atoms in crystal. But free electrons can freely move throughout the crystal.
What is meant by intrinsic semiconductor?
Semiconductor in pure form (i.e. without doping) is called intrinsic or i-type semiconductor. The no of charge carrier in this case is determined by the materials itself only and not by the impurities. In an intrinsic semiconductor number of excited free electron is equal to the number of holes.
If a pure Si crystal has a million free electrons inside it how many holes does it have.what happens to the no of free electrons and holes if the ambient temperature increases?
If the crystal is pure Si (no dopants or impurities) then the number of free electrons in the conduction band will be equal to the number of holes in the valence band. Each electron leaves behind a hole when it is thermally excited into the conduction band. If the ambient temp. increases, there will be more thermal energy available which will increase both the number electrons and the number of holes.
Why Si is semiconductor and Cu is conductor?
silicon has 4 valence electrons leaving a half empty shell sharing electrons covalently with its neighbors leaving no free electrons, copper has 1 valence electron which is so loosely bound it forms an electron gas which conducts easily. silicon can be doped with tiny amounts of impurities having 5 or 3 valence electrons, providing free electron or missing electrons called holes to carry current.
What happens to the number of free electrons and holes in an intrinsic semiconductor when the temperature decreases?
increases
4. If a pure silicon crystal has 500000 holes inside it how many free electrons does it have?
In an intrinsic semiconductor like pure silicon, the number of free electrons is equal to the number of holes. Therefore, if there are 500,000 holes present, there will be 500,000 free electrons.
How can you increase number of free electron and holes in semi conductor?
To increase the number of free electrons in a semiconductor, you can dope it with donor atoms like phosphorus. This introduces extra free electrons into the material. To increase the number of holes, you can dope the semiconductor with acceptor atoms like boron, creating extra holes for electrons to move into.
Is the current in intrinsic semiconductos du to fre electrons or valence electrons and what is the diff between them?
Well intrinsic semiconductor is semiconductor crystal with no impurities in it. In intrinsic semiconductor the electrons in valence band(valence electrons) gain energy(due to thermal enegry) and break free into conduction band(means it become free electrons). As this electron breaks free, a vacancy is created in place of it. It is called as a hole. This hole has a positive charge. So current in semiconductor is due to flow of this free electrons and holes. But this current is very small in magnitude. The difference between free electrons and valenece electrons is that valence electrons are often bonded to other atoms in crystal. But free electrons can freely move throughout the crystal.
How are N-type semiconductor used in semiconductor diode?
p-type semiconductor is obtained by carrying out a process of doping that is by adding a certain type of atoms to the semiconductor in order to increase the number of the free charge carriers.
Can you dope a semiconductor with holes instead of electrons?
Doping with Group III elements, which are missing the fourth valence electron, creates "broken bonds" (holes) in the silicon lattice that are free to move. The result is an electrically conductive p-type semiconductor.
What is meant by intrinsic semiconductor?
Semiconductor in pure form (i.e. without doping) is called intrinsic or i-type semiconductor. The no of charge carrier in this case is determined by the materials itself only and not by the impurities. In an intrinsic semiconductor number of excited free electron is equal to the number of holes.
How many free electrons in semi-conductor?
A semiconductor typically has fewer free electrons than a conductor but more than an insulator. The number of free electrons in a semiconductor can vary based on factors like doping and temperature, but in general, it is on the order of 10^15 to 10^19 free electrons per cubic centimeter.
If a pure Si crystal has a million free electrons inside it how many holes does it have.what happens to the no of free electrons and holes if the ambient temperature increases?
If the crystal is pure Si (no dopants or impurities) then the number of free electrons in the conduction band will be equal to the number of holes in the valence band. Each electron leaves behind a hole when it is thermally excited into the conduction band. If the ambient temp. increases, there will be more thermal energy available which will increase both the number electrons and the number of holes.
A material with many free electrons is referred to as a good what?
semiconductor
Why is silicone a widely preferred semiconductor?
because its valence electrons are free and it is used to the free moving of electrons..so they are used as semiconductors
Why intrinsic semiconductors are not used in practice for manufacturing of electronics devices?
The main reason semiconductor materials are so useful is that the behavior of a semiconductor can be easily manipulated by the addition of impurities, known as doping. Semiconductor conductivity can be controlled by introduction of an electric or magnetic field, by exposure to light or heat, or by mechanical deformation of a doped mono-crystalline grid; thus, semiconductors can make excellent sensors. Current conduction in a semiconductor occurs via mobile or "free"electrons and holes. collectively known as charge carriers. Doping a semiconductor such as silicon with a small amount of impurity atoms, such as phosphorus or boron. greatly increases the number of free electrons or holes within the semiconductor. It can be make in very small size and the electronics device are small in size that why the semiconductors are used in electronic devices. The above explains HOW semi conductors work. The reason for WHY they are used is, what's the alternative? The only alternative is thermionic valves (tubes). Tubes fell out of favour for many reasons. They run hot Made of glass and delicate, Heavy Large Consume lots of power Need high voltages. Semi conductors are the opposite of all of these.
