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Question

(a) What change occurs when $$AgCl$$ is doped with $$CdCl_{2}$$?
(b) What type of semiconductor is produced when silicon is doped with boron?


Solution

a. When AgCl is doped with $$CdCl_2$$ a cationic vacancy is created, i.e., an $$Ag^+$$ ion from the lattice is absent from its position due to presence of adjacent $$Cd^{++}$$ . 
When AgCl is doped with $$CdCl_2$$, two $$Ag^+$$ ions are replaced by 1 $$Cd^{2+}$$ ion. So, where one $$Cd^{2+}$$ ion occupies the site of one $$Ag^+$$ ion, there is a cationic vacancy.

b. p-type semiconductor
The addition of trivalent impurities such as boron, aluminum or gallium to an intrinsic semiconductor creates deficiencies of valence electrons,called "holes". It is typical to use $$B_2H_6$$ diborane gas to diffuse boron into the silicon material.

Chemistry

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