CBSE 2024 · Region 3 · Set 2 · Q28 · 3 marks
Draw the circuit diagrams for obtaining the $\displaystyle \mathrm{V}-\mathrm{I}$ characteristics of a p-n junction diode. Explain briefly the salient features of the V - I characteristics in (i) forward biasing, and (ii) reverse biasing.On the basis of energy band diagrams, distinguish between (i) an insulator, (ii) a semiconductor, and (iii) a conductor.
Draw the circuit diagrams for obtaining the $\displaystyle \mathrm{V}-\mathrm{I}$ characteristics of a p-n junction diode. Explain briefly the salient features of the V - I characteristics in (i) forward biasing, and (ii) reverse biasing.
On the basis of energy band diagrams, distinguish between (i) an insulator, (ii) a semiconductor, and (iii) a conductor.
Marking-scheme solution
(a)
Salient features
(i)
Forward biasing - After threshold voltage or cut in voltage diode current increase significantly (exponentially), even for a small increase in the diode bias voltage.
(ii)
Reverse biasing - Current is very small ($\displaystyle \sim\mu\mathrm{A}$) and almost remains constant and it increases rapidly after breakdown voltage.
OR(b) (i) 
(ii)
(iii)
Semiconductor Electronics: Materials, Devices and Simple CircuitsClassification of Metals, Conductors and SemiconductorsUnderstandshort_answermedium
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