How does potential barrier of a semiconductor vary with temperature? – InterviewSolution

InterviewSolution

1.	How does potential barrier of a semiconductor vary with temperature?
Answer» The barrier potential of a semiconductor increases with rise in temperature. The barrier potential `(V_B)` of a semiconductor is directly proportional to temperature in kelvin (T). The relation between barrier potential `V_B` and temperature TK in terms of the hole concentration on either side of the junction is given by `V_(B)=(k_(B)T)/qlog_(e)(p_(p)/P_(n))` where `k_(B)=` Boltzmann constant, `p_(p) =` hole concentration in p-side,` p_(n) =` hole concentration in n-side. The relation between barrier potential and temperature in terms of donor concentration `(N_d)` on the n-side and acceptor concentration `(N_a)` on the p-side is given by `V_(B)=(k_(B)T)/qlog_(e)((N_a N_d)/n_(i)^(2))` where `n_(i)` is the intrinsic carrier concentration.

Discussion

No Comment Found

Related InterviewSolutions

Assuming the ideal diode, draw the output waveform for the circuit given in Fig.Explain the waveform.
Draw the output waveform across the resistor (Fig.)
Calculate the value of output voltage`V_(0)` and I if the Si diode and the Ge diode conduct at 0.7 V and 0.3V respectively, in the circuit given in Fig. If now Ge diode connections are reversed, what will be the new values of `V_(0)` and I.
Why does the width of depletion layer of a p-n junction increase in reverse biasing?
How does the width of the depletion layer of a p-n junction diode change with decrease in reverse bias?
The V-I characteristics of silicon diode is shown in Fig. Calculate the diode resistance in `` forward bias at `V=+0.9V ` reverse bias `V=-3.0V`.
What do the acronyms LASER and LED stands for? Name the factor which determines (i) frequency and (ii) intensity of light emitted by LED.
In a transistor base is made thin and doped with little impurity atoms. Why?
For the circuit shown in Fig., find the current flowing through the `1Omega` resistor. Assume that the two diode are ideal diode.
Why is a photodide operated in reverse bias mode? Fig. shown reverse bias current, under different illuminating intensities `I_(1)I_(2),I_(3)` and `I_(4)` for a given photodiode. Average the intensities `I_(1), I_(2),I_(3)` and `I_(4)` in decreasing order of wavelength.