The electrostatic potential energy for electrons increases a

The electrostatic potential energy for electrons increases as the electrons move towards which energy band? A Czochralski crystal is grown with an initial Sb concentration in the melt of 1 times 10^16 cm^-3. After 80% of the in melt has been used up in pulling the crystal, pure silicon is added to return the melt to its original volume. Growth is then resumed. What will the Sb concentration be in the crystal after 50% of the new melt has been consumed by growth? Assume ko = 0 02 for Sb. At temperatures above 600 degree C, typical device processing temperatures, the intrinsic carrier concentration dominates over the extrinsic carriers. The Fermi level is defined as the energy position where the probability of finding an electron is___and for an n-doped semiconductor, this position is closest to the___band. 100%, valence 50%, conduction 50%, valence 100%, conduction The depletion region of a PN junction widens as a reverse bias applied to the terminals increases. Why? Assuming that a 10 kg pure silicon charge is used, what is the amount of boron that must be added to get the boron-doped silicon having a resistivity of 0 01 ohm-cm when one half of the ingot is grown? NOTE the molecular weight of boron is 10 81 g/mole In silicon, the lattice constant is 5 43 Ang. Assume a hard sphere model. Calculate the radius of a silicon atom Determine the density of silicon atoms m atoms/cm^3 Use the Avogadro constant to find the density of silicon The seed crystal used in the CZ process is usually necked down to a small diameter (5 5 mm) as a mean to initiate dislocation-free growth. If the critical yield strength of silicon is 2 times 10^6 g/cm^2, calculate the maximum length of a silicon ingot 200 mm diameter that can be supported by such a seed.

Solution

3. Conduction Band

As the electrostatic potential energy is proportional to voltage, when the electrons moves towards conduction band the voltage increases which increases electrostatic potential energy.