Temperature coefficient of resistence is negative for

A negative coefficient for a material means that its resistance decreases with an increase in temperature. Semiconductor materials (carbon, silicon, germanium) typically have negative temperature coefficients of resistance.

What are semiconductor materials?

A semiconductor material has an electrical conductivity value falling between that of a conductor, such as metallic copper, and an insulator, such as glass. Its resistivity falls as its temperature rises; metals are the opposite.

What are the Characteristics  of semiconductor materials?

At absolute zero, semiconductors are perfect insulators, The density of electrons in the conduction band at room temperature is not as high as in metals, thus cannot conduct current as good as metal. The electrical conductivity of semiconductors is not as high as metal but also not as poor as an electrical insulator.

What is the Purpose  of semiconductor materials?

Semiconductor, any of a class of crystalline solids intermediate in electrical conductivity between a conductor and an insulator. Semiconductors are employed in the manufacture of various kinds of electronic devices, including diodes, transistors, and integrated circuits.