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What will happen when doped semiconductor is heated will its conductivity increase or decrease?
Doping a semiconductor means to introduce impurities to the semiconductor in order to alter it. For the most part, doping a semiconductor increases its conductivity.
What are the two classifications of transistors?
The two basic types of transistors are the NPN transistorand the PNP transistor. Certainly there are many other semiconductor devices, but these are arguably the two basic ones.
What can be viva question from the transistor characteristics in common emitter?
Transistor Characteristics1) What is transistor? what are the types of transistors?Ans: Transistor is a three terminal semiconductor device.There are two types of semiconductor i.e,. n-p-n and p-n-p.2) Define n-type and p-type semiconductors.Ans: If an intrinsic semiconductoris doped with pentavalent impurity. Then it is called n-type semiconductors.If it is doped with trivalent impurity then it is called p-type semiconductor.3) What is doping?Ans: Adding trivalent or pentavalent impurity to an intrinsic semiconductor is called doping.4. What are three basic transistor connection modes? Which mode is most preferred? Why?Ans: Common-Emitter, Common-Base & Common-Collector connections.CE mode is most preferred because CE modes gives Highest voltage gain.5. Define current amplification factor of a transistor?Ans: It is defined as ratio of change in collector current to change in base current.7. What is the biasing rule of transistor?Ans: Emitter base junction should be forward biased and collector base junction should be reversed biased.8. What is semiconductor?Ans: Semiconductor is a substance which has the resistivity in between that of conductor and insulator. semiconductor has negative temperature coefficient of resistance.9) Which are the commonly used semiconductors?Ans: Germanium & Silicon
What part of transistor are moderately doped?
base
When a diode is doped with either a pentavalent or a trivalent impurity its resistance will be?
it will increase
In electronics what is a wafer of semiconductor material processed to form a type of integrated circuit is?
Silicon which is then doped accordingly.
Explain why arsenic-doped silicon conducts electric current better than pure silicon?
Pure silicon is intrinsic. It has a high resitivity which means it is a poor conductor of electricity in this state. The dopant that is introduced during the doping process can be arsenic, boron or phosphorous. These are the traditional choices to dope the intrinsically pure silicon. After the pure silicon becomes doped its electrical properties change. The main change is it has a lower resistivity and will conduct electricity. This is why silicon is called a semiconductor.
What are the examples of p-type semiconductors?
Examples of p-type semiconductors include materials like boron-doped silicon, gallium arsenide, and aluminum gallium arsenide. These materials have a deficiency of electrons, leading to "holes" in the crystal lattice that behave as positive charges.
Why for making an n-type semiconductor silicon or germanium is doped with only fifteenth group element like phosphorus?
in silicon or germanium, the valence shell contain 4 electrons. in order to attain stability, they need 4 more electrons, so we doping it either with trivalent or pentavalent impurities. if we are doping semiconductor with any of these, we call it as an extrinsic semiconductor if we are using pentavalent impurity such as phosphorous, there will be an extra electron,which will go to conduction band. we know electron has negative charge therefore we call it as n-type semiconductor
What results when phosphorus and si are combined?
phosphorus-doped silicon ( n-type semiconductor) can be be produced by adding phosphorus to silicon to obtain a mixture, then heating and melting the obtained mixture. Or add phosphorus to already melted silicon.
What is intrinsic scmicondoctor?
A completely pure semiconductor crystal is called intrinsic, to underline that no substance is inserted in the crystal as impurity. An intrinsic semiconductor has a very low conductivity (it is almost an insulator, even if a current can flow if it undergoes a great voltage difference. Selected intrinsic semiconductors like Indium Phosphate (InP) or Gallium Arsenide (GaAs) are instead very effective in creating photo-stimulated electrical current (that is electrical current due to absorption of incident light) at a specific frequency called resonance frequency of the semiconductor. Other semiconductors (like Silicon, Si) lack this capability. This difference is related to the quantum mechanical behaviour of electrons in the different crystals. A semiconductor crystal where selected substances called dopants (like phosphorous or arsenic) are inserted in the crystal to give it particular properties is called doped semiconductor. Doping is more frequently used to create free charges in the semiconductor and increase conductivity. Depending on the sign of the virtual particle generated by doping in the crystal the doped semiconductor is called p doped (positive carrier generated) or n doped (negative carrier generated).
What kind of material is a transistor made from?
The class of materials that make up transistors is "semiconductor." A transistor is often made from very pure silicon that is doped with germanium or other dopant to change its electrical properties.
What has the author D R Meyers written?
D. R Meyers has written: 'Technical impediments to a more effective utilization of neutron transmutation doped silicon for high-power device fabrication' -- subject(s): Semiconductor doping, Silicon, Neutron irradiation
What is a material that has resistance in between a conductor and an insulator?
A semiconductor is a material that has resistance in between a conductor and an insulator. This means that it can conduct electricity under certain conditions but acts as an insulator under others. Examples include silicon and germanium.
What will happen when doped semiconductor is heated will its conductivity increase or decrease?
Doping a semiconductor means to introduce impurities to the semiconductor in order to alter it. For the most part, doping a semiconductor increases its conductivity.
What is conductivity of n type semiconductor?
What's the silicon doped with? Antimony? Arsenic? Phosphrus? And, much more importantly, how heavily is the silicon doped? Are there 1020 electrons per meter-3 or is 1025 electrons per meter-3 more the order of the day? Graphite is used as a conductor in some electrochemical cells. Processed and compressed graphite is used as brush material in electric motors. Without more information, the best answer that can be offered is a bit general. What is the electrical conductivity of n-type silicon graphite? Pretty good.
What is the difference between phosphorus doped and gallium doped semiconductors?
phosphorus doped semiconductor will be N type.gallium doped semiconductor will be P type.There are also other differences due to the different size of the dopant atoms.
