Metals, semiconductors, and insulators, Electrical Engineering

Metals, Semiconductors, and Insulators

  1. For electrons to move within an applied electric field there have to be states available to them.
  2. A totally filled band cannot contribute to current transport; neither can a totally empty band.
  3. So, semiconductors at 0 K are perfect insulators.
  4. With thermal or optical excitation, a number of these electrons can be excited from the valence band to the conduction band, and after that they can contribute to the current transport process.
  5. At temperatures other than 0 K, the magnitude of the band gap take aparts an insulator from a semiconductor, for example at 300 K, Eg(diamond) = 5 eV (insulator), and Eg (Silicon) = 1.12 eV (semiconductor).
  6. Number of electrons presented for conduction can be increased greatly in semiconductors via reasonable amount of thermal or optical energy.
  7. In metals, the bands are either partially filled or they overlap => so, electrons and empty states coexist => great electrical conductivity.
Posted Date: 1/11/2013 3:05:39 AM | Location : United States







Related Discussions:- Metals, semiconductors, and insulators, Assignment Help, Ask Question on Metals, semiconductors, and insulators, Get Answer, Expert's Help, Metals, semiconductors, and insulators Discussions

Write discussion on Metals, semiconductors, and insulators
Your posts are moderated
Related Questions
Issue In Sub-Transmission and Distribution Systems The major issue in Sub-transmission and Distribution systems or rather the issue confronting the power sector as an overall,

Test Schedule - Meter Testing The test schedule as per the Central Electricity Authority Regulations on Installation and Operation of Meters is given below. Table: Test S

Q. The K map of a logic function is shown in Figure. (a) Obtain a POS expression and its corresponding realization. (b) For the purpose of comparison, obtain the correspondin

Can I have formulas for calculation of 50TN seting on 33KV overhead line

Q. Show the Complement Representation?   There are two types of complements for each number system. r's and (r-1)'s complement ex.             decimal

Explain the difference between a JMP instruction and CALL instruction. A JMP instruction permanently alters the program counter. A CALL instruction leaves information on the st

Q. Determine the Thevenin resistance viewed from terminals A-B of the circuit of Figure by setting independent sources to be zero and applying a test voltage at terminals A-B.

Q. The response y(t) of a linear system to a unit-step excitation is y(t) = (4 - 10e -t + 8e -2t )u(t). (a) Find the system function. (b) Find the frequency at which the fo

it''s 3 assignments and each assignment have 7 questions so each assignment have 1 hour when I open it I have only 1 hour to finish it I can show him or her the practice question t

I want to make project plz help me n gove me idea about actually its my first year in electrical engineering thts why Ineed help hpfully you will reply soon