Explain Conductivity of Metals: Conductivity of Metals - Consider a conductor of length l metres and cross-sectional area A square metres, as shown in Fig. 6.27. Let the number of free electrons available per m3…
Relaxation Time, Collision Time and Mean Free Path: The relaxation time is closely related to the mean time of flight between collision and also to the mean free path of the conduction electrons, which is…
Charge Densities in Extrinsic Semiconductor: Charge Densities in Extrinsic Semiconductor - Equation (6.19) provides relationship between the electron and hole concentrations n and p respectively. If ND is the concentration of donor atoms, there will…
Mass Action Law in Semiconductor: As already mentioned, concentration of free electrons and holes is always equal in an intrinsic semiconductor. When N-type impurity is added to an intrinsic semiconductor, the concentration of free electrons…
What is Extrinsic Semiconductor? Intrinsic (or pure) semiconductor by itself is of little significance as it has little current conduction capability at ordinary room temperature. However, the electrical conductivity of intrinsic semiconductor can be increased…
What is Intrinsic Semiconductor? An intrinsic semiconductor is one which is made of the semiconductor material in its extremely pure form. A semiconductor is not truly intrinsic unless its impurity content is less than one…
Fermi Dirac Function in Semiconductor: It is important to know what energies are possessed by a mobile carrier in a solid or semiconductor. This relationship is referred to as energy distribution function. We are concerned…
What is Atomic Bonds and Types? Whether a material is a conductor, a semiconductor, or an insulator depends largely upon what happens to the outer-shell electrons when the atoms bond themselves together to form a…
Drift Current and Diffusion Current in Semiconductor: The two basic processes which cause electrons and holes to move in a semiconductor are : drift, which is the movement caused by electric fields, and diffusion, which…
Energy Band Diagram of Semiconductors, Insulators and Metals: Energy Band Diagram of Semiconductors, Insulators and Metals - As discussed earlier, the electrons of an isolated atom are acted upon only by the forces within that…
