Advertisements
Advertisements
Question
The graph shown in the figure represents a plot of current versus voltage for a given semiconductor. Identify the region, if any, over which the semiconductor has a negative resistance.
Advertisements
Solution
Resistance of a material can be found out by the slope of the curve V vs. I. Part BC of the curve shows the negative resistance as with the increase in current, voltage decreases.
APPEARS IN
RELATED QUESTIONS
What causes the setting up of high electric field even for small reverse bias voltage across the diode?
Draw a labelled diagram of a full wave rectifier. Show how output voltage varies with time if the input voltage is a sinusoidal voltage.
In a photo diode, the conductive increases when the material is exposed to light. It is found that the conductivity changes only if the wavelength is less than 620 nm. What is the band gap?
(Use Planck constant h = 4.14 × 10-15 eV-s, Boltzmann constant k = 8·62 × 10-5 eV/K.)
A plate current of 10 mA is obtained when 60 volts are applied across a diode tube. Assuming the Langmuir-Child relation \[i_p \infty V_p^{3/2}\] to hold, find the dynamic resistance rp in this operating condition.
Answer the following question.
Why photodiodes are required to operate in reverse bias? Explain.
With reference to Semiconductor Physics,
Name the diode that emits spontaneous radiation when forward biased.
In forward bias width of potential barrier in a p + n junction diode
In Figure, Vo is the potential barrier across a p-n junction, when no battery is connected across the junction ______.
When an electric field is applied across a semiconductor ______.
- electrons move from lower energy level to higher energy level in the conduction band.
- electrons move from higher energy level to lower energy level in the conduction band.
- holes in the valence band move from higher energy level to lower energy level.
- holes in the valence band move from lower energy level to higher energy level.
Describe the following term briefly:
breakdown voltage in reverse biasing
