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Semiconductor Electronics: Materials, Devices and Simple Circuits — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronics: Materials, Devices and Simple Circuits3 Marks
Question
What is called P-N junction? Name the methods of making P-N junction. Explain the diffusion method of making $P - N$ junction.
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Answer

P-N Junction: If P and N type semiconductors are joined together and kept in such a way that the atoms of the contact plane come together, then the contact plane formed in this way is called $P - N$ junction. There are three methods of making P-N junction :
(1) Growth
(2) Diffusion
(3) Metal Mixture.
Diffusion method of making P-N junction : In this at high temperature in a muffle furnace, impurity semiconductor is formed by bringing the intrinsic semiconductor wafer with appropriate impurity in contact with steam. The impurity semiconductor thus obtained is now known as the opposite impurity diffusion is caused by bringing atoms (P-type semiconductor with V-group element and Ntype semiconductor with III-group element) in contact. The amount of diffusion decreases with depth. As a result, as far as there are impurities in the crystal, joints are present there.

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