Silicon is the best semiconductor from the all options given above, Semiconductors are the materials whose conductivity falls in between Conductor and Insulator. In above option Wood, Glass and Calcium are not even a poor conductor. Conductivity of any Semiconductor is decreased when the temperature is increased. In normal from a semiconductor is a very poor conductor and the conductivity of this kind of material is increased by adding some impurities and this process is known as Doping. There are two type of Semiconductors N type and P type.Silicon is widely used semiconductor as compare to germanium because it have the quality of working at high temperature.