What are the majority carieres of electric current in Boron-doped Silicon? Holes

Question

What are the majority carieres of electric current in Boron-doped Silicon? Holes Electrons Boron ions Silicon atoms Cold-worked aluminum has a higher electrical resistivity than annealed aluminum. This is because cold-worked Al has a higher strength so the resistivity is increased cold-worked Al has a higher dislocation density so the resistivity is increased the martensite that forms in cold-worked Al naturally has a higher resistivity the grains are aligned from cold-work and the alignment causes the resistivity to increase The addition of a boron (B) impurity to otherwise pure silicon (Si) will Decrease conductivity due to additional scattering of electrons due to the impurity Create an additional allowable energy level inside the band-gap called an acceptor level Create an extrinsic semiconductor with the majonty charge carrier being a hole instead of an electron All of the above c) A and B only A and C only B and C only What would you predict would result from adding a small amount of nitrogen (called "doping") to an otherwise pure silicon material? The nitrogen impurity will increase resistivity Nitrogen will create vacancies that will decrease resistivity Nitrogen is a gas and should have no impact on the electronic properties of the silicon Nitrogen will create a "donor level" in the band structure that results in an n-type extrinsic semiconductor Nitrogen will create an "acceptor level" in the band structure that results in a p-type extrinsic semiconductor Nitrogen will make the silicon more intrinsic which will cause a decrease in resistivity Assuming the electrical conductivity of pure silver is higher than pure copper, what would you predict would result from adding -0.5wt% silver to an otherwise pure copper material? Conductivity will increase Conductivity will decrease Conductivity will not change It's impossible to predict without more information True/False Resistance is a measure of performance while resistivity is a material property. Resistivity of a metal will increase with increasing temperature. Resistivity of an intrinsic semiconductor will increase with increasing temperature. It's possible for a compound semiconductor to exhibit intrinsic behavior. The band structures for electrical insulators and semiconductors are similar except for the magnitude of the band gap.

Explanation / Answer

1) C

2) d

3) e

4) a

5) a

6) ture

7) false

8) false

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.