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A semiconductor material forms a crystal structure where all the valence electrons "participate" in forming the lattice. There are neither "extra" nor "missing" electrons in the structure. If we dope the semiconductor with a "P-type" material, this sets the stage for the creation of a "hole" in that matrix. The P-type material will have one less valence electron than our semiconductor material. And when that P-type atom becomes part of the crystal matrix, it lacks that one electron to make the matrix "complete" or "uniform" as regards the electrons. That creates the hole in the matrix. When that P-type material is formed up against N-type material (which has an "extra" electron in its matrix), that extra electron will leave the N-type material and migrate to the P-type material to fill that hole. This sets up a condition where charges have shifted, and it creates a difference of potential (voltage) across the junction (owing to the shift of the electrons).
What else can I help you with?
What are examples of semiconductors?
Germenium and silicon are the examples of Semiconductors.
What extrinsic semiconductor is?
Those semiconductors in which some impurity atoms are embedded are known as extrinsic semiconductors.
What is the difference between power semiconductors and semiconductors?
power semiconductorspower semiconductors can drive large currents during forward biassemiconductorsemiconductors drive small currents during forward bias
Are there semiconductors on a Motherboard?
many of them.
Why do we mostly use indirect semiconductors?
The indirect band gap semiconductors like silicon and germanium are mostly used because they are elemental, plentiful, and easier to process than the direct band gap semiconductors which are alloys or compounds.
What is the concept of an electron hole and how does it affect the behavior of semiconductors?
An electron hole is a positively charged area in a semiconductor where an electron is missing. When an electron moves to fill the hole, it creates a flow of electricity. This movement of electrons and holes is crucial for the functioning of semiconductors, allowing them to conduct electricity and perform tasks like switching in electronic devices.
What are the key principles and characteristics of the Bardeen model for semiconductors?
The key principles and characteristics of the Bardeen model for semiconductors include the concept of energy bands, electron-hole pairs, and the behavior of charge carriers in a semiconductor material. The model helps explain how semiconductors conduct electricity and how they can be used in electronic devices.
What are degenerate and non degenerate semiconductors?
Non degenerate semiconductors are those which: -are lightly doped -have less value of electron and hole concentration -violate Pauli's exclusion principle Degenerate semiconductors are those which: -are highly doped -have high value of electron and hole concentration -follow Pauli's exclusion principle
What are p type semiconductors?
P type semiconductors have been doped with trivalent elements, causing them to conduct via "hole" flow. N type semiconductors have been doped with pentavalent elements, causing them to conduct via electron flow.
What has the author A A Rogachev written?
A. A. Rogachev has written: 'Sotsial'noe razvitie sela' 'Trudovye resursy sela: vosproizvodstvo, ispol'zovanie' 'Electron-hole liquids in semiconductors' -- subject(s): Liquid semiconductors
What is light and heavy hole in semiconductor?
In semiconductors, a light hole and a heavy hole refer to different energy states that are created in the valence band. Light holes have lower effective mass and higher mobility, while heavy holes have higher effective mass and lower mobility. These terms are important in understanding the electronic band structure of semiconductors and their properties.
Which two statements describe the reasons a solar cell must contain semiconductors?
Semiconductors have properties that allow them to convert sunlight into electricity through the photovoltaic effect. The band gap in semiconductors enables them to absorb photons from sunlight and generate electron-hole pairs for creating an electric current.
The merging of a free electron and a hole is called?
The merging of a free electron and a hole is called recombination. This process occurs in semiconductors when an electron fills a hole in the valence band, resulting in the release of energy in the form of light.
Effective mass of holes?
The effective mass of a hole is a concept used in solid-state physics to describe the behavior of a hole in a crystal lattice. It represents the mass of an electron in the context of hole motion and is typically expressed as a positive value equal to the negative of the electron's mass. It is an important parameter for understanding the electrical and optical properties of semiconductors.
Application of semiconductors?
Application of semiconductors
What roles do free electrons and holes play in intrinsic semiconductor?
Free electrons and holes are the charge carriers-not only in intrinsic semiconductors(these are the purest form of semiconductors-typically as pure as can be made available with the present technology) but also in extrinsic semiconductors(doped semiconductors).In intrinsic semiconductors,electron-hole pairs are created due to the natural processes like-absorption of heat energy from the surroundingsabsorption of energy from photons.this absorbed energy results in breakdown ofcovalant bonds in intrinsic semiconductors as a result of which electron-hole pairs are created.It is this electron hole pair which is responsible for carrying the current through the intrinsic semiconductor when a potential difference is applied across it.In extrinsic semiconductor the case is slightly different-here, we have-majority charge carriers and minority charge carriers.in an n-type semiconductor-majority charge carriers are the electrons contributed by the pentavalent impurities while the minority charge carriers are the holes which are generated as electron-hole pairs due to natural processes discussed above.in p-type semiconductor-majority charge carriers are the holes contributed by trivalent impuritieswhereas the minority charge carriers are the electronswhich are generated as electron-hole pairs due to natural processes discussed above.these are the majority charge carriers which contribute heavily in the flow of current through the extrinsic semiconductors than the minority charge carriers.I suggest you to please go through mass action law and law of electrical neutrality of semiconductors for better understanding.
Is in p type semiconductors electron hole pair is form at room temperature?
In p-type semiconductors, electron-hole pairs can be created at room temperature by thermal excitation. When a hole is created by an electron moving from the valence band to the conduction band, a corresponding electron-hole pair is formed. This process can occur due to energy supplied by thermal vibrations even at room temperature.
