At Room Temperature An Intrinsic Semiconductor Has

When an electron leaves the valence band it creates a vacancy known as hole.

At room temperature an intrinsic semiconductor has.

Multiple choice questions and answers on semiconductor theory. An intrinsic semiconductor is capable to conduct a little current even at room temperature but it is not useful for the preparation of various electronic devices. An external voltage source is applied to a p type semiconductor. Fewer than 1 billion.

Suppose an intrinsic semiconductor has 1 billion free electrons at room temperature. A hole attracts electrons as it is positively charged. An example is hg 0 8 cd 0 2 te at room temperature. Determine the nature of the semiconductor.

4 8 1 0 2 0 m 3 then the concentration of holes in the semiconductor is. 4 the hall coefficient of certain silicon specimen was found to be 7 35 10 5 m 3 c 1 from 100 to 400 k. The electrical conductivity of intrinsic semiconductors can be due to crystallographic defects or electron excitation. In an intrinsic semiconductor the number of electrons in the conduction band is equal to the number of holes in the valence band.

If the donor concentration level is 0. A crystal of intrinsic silicon at room temperature has a carrier concentration of 1. In intrinsic semiconductor number of free electrons is equal to number of holes. At room temperature i e 300 k a semiconductor made of gallium arsenide gaas has an intrinsic electron concentration ni of 1 8 10 6 cm 3 an electron mobility μe of 8500 cm 2 v 1 s 1 and a hole mobility μh of 400 cm 2 v 1 s 1.

At room temperature an intrinsic semiconductor has a a few free electrons and holes b many holes c many free electrons d no holes e none of the above. Thus to make it conductive a small amount of suitable impurity is added to the material. A calculate the intrinsic electric conductivity and resistivity of gaas at 300 k. In addition to reading the questions and answers on my site i would suggest you to check the following on amazon as well.

The intrinsic carrier density at room temperature in ge is 2 37 10 19 m 3 if the electron and hole mobilities are 0 38 and 0 18 m 2 v 1 s 1 respectively calculate the resistivity. More than 1 billion. An intrinsic semiconductor has some holes in it at room temperature. At room temperature 3 0 0 k e l v i n the electrons in the valence band are moved to the conduction band.

What causes these holes.