Quickcomputerstips
Compound semiconductors will underpin the Internet of Things by virtue of their greater power efficiency (for battery-powered devices) and optical properties (in sensors for new imaging techniques implemented in connected cars, healthcare, and industrial applications).
- What are compound semiconductors explain with examples?
- Why are compound semiconductors called direct band gap semiconductors?
- Which one of the following are properties of compound semiconductors?
- What is elemental and compound semiconductors?
- Why is a direct bandgap semiconductor more useful than an indirect bandgap semiconductor for the development of a light emitting diode?
- Which of the following is compound semiconductor?
- What are compound semiconductors and alloy semiconductors?
- Why do we prefer semiconductors over conductors?
- What properties of semiconductors make them useful?
- What materials are needed for semiconductors?
- Why are semiconductors so important?
- How do semiconductors work?
- How are compound semiconductors made?
- What is the advantage of direct bandgap semiconductor materials for optical sources?
- What are direct and indirect bandgap semiconductors which of them is preferred for LEDs and why?
- What is direct semiconductor?
What are compound semiconductors explain with examples?
Apart from silicon, there are compound semiconductors that combine Group III and V elements and Group II and VI elements. For example, GaAs, InP, InGaAlP, etc. have been conventionally used for high-frequency devices and optical devices.
Why are compound semiconductors called direct band gap semiconductors?
The band gap is called "direct" if the crystal momentum of electrons and holes is the same in both the conduction band and the valence band; an electron can directly emit a photon. ... Examples of direct bandgap materials include amorphous silicon and some III-V materials such as InAs and GaAs.
Which one of the following are properties of compound semiconductors?
At absolute zero, semiconductors are perfect insulators, The density of electrons in conduction band at room temperature is not as high as in metals, thus cannot conduct current as good as metal. The electrical conductivity of semiconductor is not as high as metal but also not as poor as electrical insulator.
What is elemental and compound semiconductors?
The elemental semiconductors are those composed of single species of atoms, such as silicon (Si), germanium (Ge), and tin (Sn) in column IV and selenium (Se) and tellurium (Te) in column VI of the periodic table. There are, however, numerous compound semiconductors, which are composed of two or more elements.
Why is a direct bandgap semiconductor more useful than an indirect bandgap semiconductor for the development of a light emitting diode?
The same principle applies to recombination of electrons and holes to produce photons. The recombination process is much more efficient for a direct band gap semiconductor than for an indirect band gap semiconductor, where the process must be mediated by a phonon.
Which of the following is compound semiconductor?
Compound semiconductors are the compounds of the elements of Groups II and VI (e.g., ZnO, ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, CdSSe, etc.
What are compound semiconductors and alloy semiconductors?
A III-V compound semiconductor is an alloy, containing elements from groups III and V in the periodic table. Different material systems combining these elements have been produced, the most commonly known of which is GaAs. Within the III-V semiconductors there are the nitride semiconductors subset.
Why do we prefer semiconductors over conductors?
In Conductors, there is full flow of current (Zero resistance). Semiconductors, can act both as an insulator as well as a conductor based on the voltage input. Hence, there is a possibility to control the current flow in semiconductors.
What properties of semiconductors make them useful?
The property of semiconductors that makes them most useful for constructing electronic devices is that their properties allow them to be used to control the flow of charge. Atomic particle with a positive electric charge. How can an object become charged? Objects become charged when their atoms gain or lose electrons.
What materials are needed for semiconductors?
The most used semiconductor materials are silicon, germanium, and gallium arsenide. Of the three, germanium was one of the earliest semiconductor materials used. Germanium has four valence electrons, which are electrons located on the outer shell of the atom.
Why are semiconductors so important?
Semiconductors are an essential component of electronic devices, enabling advances in communications, computing, healthcare, military systems, transportation, clean energy, and countless other applications.
How do semiconductors work?
Semiconductors works due to imbalance of electrons that carry negative charge. This imbalance of electrons generates positive (where there are excess protons) and negative charges (where there are excess electrons) at two ends of surfaces of the semiconductor material. This is how semiconductor works.
How are compound semiconductors made?
Most compound semiconductors are from combinations of elements from GroupIII and GroupV of the Periodic Table of the Elements (GaAs, GaP, InP and others). ... It is also possible to use different elements from within the same group (IV), to make compound semiconductors such as SiC.
What is the advantage of direct bandgap semiconductor materials for optical sources?
Direct-bandgap semiconductors can emit light efficiently because electrons can drop directly from the conduction band to the valence band without changing their momentum, which requires interactions that can drain away energy.
What are direct and indirect bandgap semiconductors which of them is preferred for LEDs and why?
In direct band gap semiconductors like gallium nitride most of these electrons are in the trough of the conduction band and may move to the valence band without any change in momentum from a phonon. ... For these reasons indirect semiconductors are not likely to be used for LEDs.
What is direct semiconductor?
A direct semiconductor is used when the valence and conduction bands have the same momentum. This semiconductor is important in radiative recombination, in which an electron jumps from one band to the other. In the science of energy, a direct semiconductor works with two bands.
