Semi-conductors, Physics

Assignment Help:

 

Semiconductor is solid material whose electrical conductivity at room temperature lies between conductivity of a conductor and that of an insulator. At high temperatures its conductivity approaches that of a metal, and at low temperatures it acts as insulators. Every material can be classified as a conductor, an insulator, or a semiconductor. These three distinct classes of material arise from a difference in the structure of the allowed electron energy level. In particular every material possesses both valance and a conduction band for electrons and the energy difference between these two bands will determine how easily an electric current will pass through the material. In semiconductor there is a limited movement of electrons, depending upon the crystal structure of the material used. The substances firstly used for semiconductors were the elements Silicon, germanium and gray tin. It was establish that the incorporation of some impurities in them improves their conductive properties. The property either adds free electrons or creates in holes in the crystals structures of the host substances by attracting electrons. Thus there are two kinds of semiconductors: N-type (negative) in which the current carriers are negative and the P-type, in which the positively charged holes move and carry the current. The process of adding this impurity is called doping, the impurities themselves are called do pants. Certain chemical compounds, including Gallium Arsenide, Indium antimonite, and aluminium phosphate are semiconductors.

 


Related Discussions:- Semi-conductors

Calculate the work done by the average force, Total height of the gymnast j...

Total height of the gymnast just before falling back down is=(2+.3)=2.3m Energy gained at that point = m*g*h(m=mass, g=gravitational force, h=height) =55*9.8*2.3=1239.7 J

Determine the weight of a body, Determine the weight of a body. Princip...

Determine the weight of a body. Principle: When a spring is fixed at one end and a force is applied to the other end the stretching of the spring is proportional to the applie

Explain galvanometer increase voltage sensitivity, Q. In a galvanometer, in...

Q. In a galvanometer, increasing the current sensitivity does not necessarily increase voltage sensitivity. Explain An interesting point to note is that raising the current sen

Illustrate the the diamond structure, The Diamond Structure The diamond...

The Diamond Structure The diamond cubic structure is a distinctive of materials that have its constituent materials  bound in tetrahedral bonds. Insulators like carbon, semicon

Determine the current in the capacitor, A 25nF capacitor is connected in pa...

A 25nF capacitor is connected in parallel with a coil of resistance 2kΩ and inductance 0.20H across a 100V, 4 kHz supply. Determine (a) The current in the coil, (b) The cur

Acceleration graphs, How to convert from only a displacement vs time graph ...

How to convert from only a displacement vs time graph given, to velocity AND acceleration vs time graphs?

Explain how receiver functions in fibre optic communication, Explain how re...

Explain how receiver functions in fibre optic communication system. Receiver: The optical signal received must be first converted within digital form and in case analog outp

Energy, What is potential and kinetic energy?

What is potential and kinetic energy?

Le chateliers principle, Le Chatelier's principle (H. Le Chatelier; 1888) ...

Le Chatelier's principle (H. Le Chatelier; 1888) If a system is in equilibrium, then any change imposed onto the system tends to shift the equilibrium to decrease the effect of

Motiob, Ask question #nimum 100 words accepted# what is force?

Ask question #nimum 100 words accepted# what is force?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd