Calculate the approximate donor binding energy, Electrical Engineering

Assignment Help:

Calculate the approximate donor binding energy

Calculate the approximate donor binding energy for Si (r = 11.7,mxn= 1.18 m0)

Solution: From E= m*nq4 / 2(4 πε0εr)2 [h/(2 π)]2 we have

1583_Calculate the approximate donor binding energy.png

= 1.867 x 10-20 J = 0.117 eV.

Note:  The  effective  mass  used  here  is  an  average  of  the  effective  mass  in  different crystallographic directions, and is termed as the "conductivity effective mass" with values of 1.28 m0 (at 600 K), 1.18 m0 (at 300 K), 1.08 m0 (at 77 K), and 1.026 m0  (at 4.2 K).

  1. In III-V compounds, column VI impurities (e.g., S, Se, Te) that occupying column V sites act as donors. Similarly, column II impurities (e.g., Be, Zn, Cd) that occupying column III sites act as acceptors.
  2. When a column IV material (e.g., Si, Ge) is used to dope III-V compounds, then they might substitute column III elements (and act as donors), or substitute column V elements   (And act as acceptors) => amphoteric dopants.
  3. Doping  creates a  large change  in  the electrical  conductivity,  e.g.,  with a doping  of 1015/cm3 , the resistivity of Si changes from 2 x 105 Ω-cm to 5 Ω -cm.

Related Discussions:- Calculate the approximate donor binding energy

Dc machines, explain dynamically induced emf and derive expression for it

explain dynamically induced emf and derive expression for it

Discuss how wavelet transform is suitable, Q. Discuss how Wavelet Transform...

Q. Discuss how Wavelet Transform is suitable for each application below. You can give examples  if you need to. a) multi-resolution analysis of signals and images b) space-fr

Magnetic field, what is the difference between static and induced emf

what is the difference between static and induced emf

Define instruction cycle, Define instruction cycle and T-state Instruct...

Define instruction cycle and T-state Instruction cycle is defined, as the time needed completing the execution of an instruction. Machine cycle is defined as the time needed co

Single sinusoid, Power up the "TIMS" unit by using the switch at the back. ...

Power up the "TIMS" unit by using the switch at the back. Connect the Pico Virtual Instrument (PicoScope) to the PC as per Appendix 1 On the "TIMS" unit, connect the 2 kHz (s

Three phase induction motors - motor control , Three Phase Induction Motors...

Three Phase Induction Motors A three  phase induction rotor  consists  a stators  and a motor stator has balanced three  phase  winding. These windings  are distributed in the

Charge carriers in semiconductors, Charge Carriers in Semiconductors ...

Charge Carriers in Semiconductors In a metal, the atoms are imbedded in a "sea" of free electrons, and these electrons can move as a group under the influence of an

Crystal-controlled oscillator circuits, Circuits, which provide sinusoidal ...

Circuits, which provide sinusoidal waveforms, are but useful in themselves and form the basis of many other circuits, such as square and triangular waveform generators, and clocks.

The time for the capacitor voltage to fall to 20 v, A capacitor is charged ...

A capacitor is charged to 100 V and then discharged by a 50 kΩ resistor. If the time constant of the circuit is 0.8 s, verify: (a)  The value of the capacitor, (b)  The time

On line ups systems - power supplies , On line UPS Systems In this Ups ...

On line UPS Systems In this Ups  there are two  switches  one is  main static switch  and another  is Ups  static  switch . in normal  operation the Ups  static switch  remains

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