Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Electrons and holes in semi-counductor
Metals have free electrons available in conduction band for conduction of electric current. As the valence band overlaps the conduction band and no forbidden energy gap exists in the conductor, small electric field is sufficient to move an electron into higher state without creation of hole. The flow of electrons constitute electric current.
Hence only electrons are charge carriers in metals like aluminium, copper, sliver etc.
In semiconductors, the forbidden energy gap is small. At room temperature, the electrons from valence band jump into conduction band creating a hole in valence band. When the semiconductor is connected to terminals of the battery, electrons move towards positive terminal and holes move towards negative terminal.
In the applied electric field, the electron occupies the hole by moving towards positive terminal and a new hole is created in the place of electron moved. This hole acts as a positive charge carrier, while electron acts as a negative charge carrier. Both these electron and hole currents constitute the total current.
I = Ielectrons + Ihole
Q. Explain the wave nature of matter. De - Broglie Waves Theory According to De - Broglie hypothesis, particles like electron, proton, neutron etc. show wavelike properti
A modern turbofan engine in a commercial jet takes in air, part of which passes through the compressors, combustion chambers, and turbine, and the rest of which bypasses the compre
What do you mean by Doppler's shift? Derive a mathematical expression for the apparent frequency heard by a moving listener when the source of sound is at rest. What is the effe
introduction about earth''s magnetic field
Determine the Q-factor of damped oscillator with resonant frequency 500Hz and damping coefficient 0.5 per second.
The current transformer has a single turn on the primary winding and a secondary winding of 60 turns. The secondary winding is connected to an ammeter with a resistance of 0.15
Q. The voltage increase of an amplifier without feedback is 100. If negative feedback is functioned with feedback fraction 0.1, compute the voltage gain with feedback. A F
Which phrase would be incorrect to use: (1)A molecular of a compound (2)A molecule of an element (3)An atom of an element (4)None of these Ans: (2)A molecule of a
Plane and The Wind Vectors and Projectiles Suppose the three planes within the animation below. Every plane is heading south along with a speed of 100 mi/hr. Every plane flies
An airplane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally lifts off the ground. Determine the distance traveled before takeoff. I need help of an expert who ca
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd