The major difference between a pure semiconductor and a pure metal is that
Answer Details
The major difference between a pure semiconductor and a pure metal is that the resistance of metals increases with temperature, while for semiconductors, it is the reverse. In other words, as the temperature of a metal increases, its resistance also increases, while for semiconductors, the resistance decreases with increasing temperature. This property is what makes semiconductors useful in electronic devices like transistors, diodes, and solar cells, where the electrical conductivity can be controlled by varying the temperature or by doping with impurities.