Draw the Energy bands 'diagrams for a (i...

Draw the Energy bands 'diagrams for a (i) pure semiconductor , (ii) insulator , How does the energy band, for a pure semiconductor , get affected when this semiconductor is doped with (a) an acceptor impurity
(b) donor impurity ? Hence discuss why the 'holes' and the 'electrons' respectively, become the 'majority change carries' in these two cases ?
Write the two processes involved in the formation of `p-n` junction.

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