How to use in-sentence of “impurity”:
+ Doping Doping is the process of adding a small impurity to a pure semiconductor to change its electrical properties.
+ The pentavalent impurity that is added is called a ‘dopant’ and the process of addition is called ‘doping’.
+ The amount of impurity added is very small compared to the amount of semiconductor.
+ Semiconductor has four valence electrons, when it is doped with pentavalent impurity the four valence electron makes covalent bond and the remaining one is now free to move, this is how n-type doping increases conductivity of the semiconductor.
+ They think any failure of paints or inks to match this ideal performance is due to the impurity or imperfection of the colourants.
+ When the trivalent impurity is added to an intrinsic or pure semiconductor, it is said to be a p-type semiconductor.
+ Solar cells are made of silicon crystals, but a very small amount of impurity is needed in them to work.
