Electronic Devices - Semiconductors - Discussion
Discussion Forum : Semiconductors - General Questions (Q.No. 10)
10.
For a forward-biased diode, as temperature is ________, the forward current ________ for a given value of forward voltage.
Discussion:
17 comments Page 1 of 2.
Peyush said:
1 decade ago
With increase in temperature forward current increases because increased temperature increases the dopand impurities in respective p- and n-types.
With decrease in temperature forward current decreases very little but not that much because the external voltage keeps the flow of current through the diode.
With decrease in temperature forward current decreases very little but not that much because the external voltage keeps the flow of current through the diode.
Venkatasivamma said:
1 decade ago
As the temperature increases the width of potential barrier decreases there by decrease in the width of depletion layer.
That is the electrons get energy and crosses the depletion layer within in a short time. Hence the current increases (the flow of electrons has increased).
That is the electrons get energy and crosses the depletion layer within in a short time. Hence the current increases (the flow of electrons has increased).
Harsha vardhan said:
1 decade ago
If temperature increases the width of potential barrier decreases there by decrease in the width of depletion layer.
That is the electrons get energy and crosses the depletion layer within in a short time. Hence the current increases(the flow of electrons has increased).
That is the electrons get energy and crosses the depletion layer within in a short time. Hence the current increases(the flow of electrons has increased).
Anirban said:
1 decade ago
The explanation may be done in this way also. We know that as temp increases the reverse saturation current also increases. The forward biased current of diode is proportional to the reverse sat current. So forward biased current increases with temp.
Gopal said:
1 decade ago
I=i(exp(v/k*T)-1), and i=reverse saturation current directly proportional to minority carrier conc. intern square of (intrinsic carier conc.).
Therefore exp(-Eg/k*T) increases with increase in temparature. Hence I increase with temperature...
Therefore exp(-Eg/k*T) increases with increase in temparature. Hence I increase with temperature...
Basha said:
1 decade ago
May be this will help you hari.
When temperature increases, the randomness in electrons flow increases which may lead in the improper flow but the applied voltage will make it as proper flow. So the flow of current should increase.
When temperature increases, the randomness in electrons flow increases which may lead in the improper flow but the applied voltage will make it as proper flow. So the flow of current should increase.
Hari shankar said:
1 decade ago
I have a doubt when temperature increases the ramdomness in electrons folw increases which may lead in the improper flow of control. So it should decrease the flow of current.
NITESH KUMAR said:
1 decade ago
I know that increase temp current increases but but at a certain temp that will become constant. Then how to say on increases temp current will be also increases.
Bheemreddy said:
1 decade ago
Due to increase of temp the minority current increase but not majority so it value is decrease by 2.5mv/degree so forward voltage decreases by increase of temp.
Shiva said:
1 decade ago
As temperature increases we know that depletion region decreases so it results flow of current increases for a given value of forward voltage.
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