What do the terms ‘depletion region’ and ‘barrier potential’ mean for a p-n junction?
In case of PN junction, the junction requires much voltage to allow the current through it.
Barrier potential is the specific voltage of the junction. We need to apply voltage which is greater than the barrier voltage then only the PN junction will conducts.
It is a conducting region. After dipping, the electrons and holes will pass through this junction. Electrons from the N side, holes from the P side will meet in the junction of PN and forms the depletion layer. It does not allow any charge carriers thought it. Both holes and electrons are stabilized here. So we can say depletion layer is an insulating layer.
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(a) A student wants to use two p-n junction diodes to convert alternating current into direct current. Draw the labelled circuit diagram she would use and explain how it works.
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What do the terms ‘depletion region’ and ‘barrier potential’ mean for a p-n junction?Physics - Exemplar
Consider a box with three terminals on top of it as shown in Fig.14.18 (a):
Three components namely, two germanium diodes and one resistor are connected across these three terminals in some arrangement.
A student performs an experiment in which any two of these three terminals are connected in the circuit shown in Fig. 14.18 (b).
The student obtains graphs of current-voltage characteristics for unknown combination of components between the two terminals connected in the circuit.
The graphs are
(i) when A is positive and B is negative
(ii) when A is negative and B is positive
(iii) When B is negative and C is positive
(iv) When B is positive and C is negative
(v) When A is positive and C is negative
(vi) When A is negative and C is positive
From these graphs of current – voltage characteristic shown in Fig. 14.18 (c) to (h), determine the arrangement of components between A, B and C.
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