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!
What is the effect of temperature on conductivity of semiconductor?
Electrical conductivity of semiconductor changes appreciably along with temperature changes. At absolute zero, this behaves as an insulator. At room temperature, due to thermal energy, several of covalent bonds of the semiconductor break. The breaking of bonds sets those electrons free that are engaged in the formation of these bonds. That results in few free electrons. Such electrons (e-) constitute a small current when potential is applied across the semiconductor crystal. It demonstrates the conductivity for intrinsic semiconductor raises with increase in temperature as specified by η = Aexp (-Eg / 2kt) where η is the carrier concentration, Eg is the band gap and T is the temperature and A is constant. When in extrinsic semiconductors, addition of small amount of impurities creates a large number of charge carriers. This number is too large which the conductivity of an extrinsic semiconductor is several times more than that of an intrinsic semiconductor at room temperature. At room temperature, in n - type semiconductor all the donors have donated their free electrons. The additional thermal energy only serves to rise the thermally produces carriers. This raises the minority carrier concentration. The temperature is reached while number of covalent bonds which are broken is large; therefore number of holes is around equal to number of electrons. Then extrinsic semiconductor behaves as intrinsic semiconductor.
Explain the two types of materials that are formed after doping. Depending on the impurity added, extrinsic semiconductors can be then subdivided in two types of class: N-ty
In a CDMA system, the signal is spread over a large bandwidth by multiplying the transmitted symbol by a sequence of short pulses, also called chips. The
Q. Explain, with the help of structure, the working of UJT? List its applications One of the oddest semiconductor devices in use is the unijunction transistor (UJT). As its nam
For large number of measurements the mean is calculated by taking a sample. Each sample that is taken has a mean. The mean of various sample difference from sample and are known to
Discuss the degeneracy of energy of energy states. Solve the Schrodinger’s equation for a free particle in three dimensional boxes and find Eigen values and Eigen function of free
kindly tell me which text book is usefull forlearn the basic electricle.
explain the alphanumeric codes
purpose of equalizer rings in lap winding
The Input Output System The input output system provides the physical connection between the equipment and the PLC there are many different kinds of I/O cards which ser
Consider the basic MOSFET circuit shown in Figure with variable gate voltage. The MOSFET is given to have very large V A , V T = 4V,and I DSS = 8 mA. Determine i D and v DS for
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: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd