2. At temperatures near room temperature, the temperature dependence of the conductivity for intrinsic E. o = CT-3/2 exp germanium is found to be given by where C is a temperature-independent constant and T is in Kelvins. Using Equation above, calculate the intrinsic electrical conductivity of germanium at 140°C.

Given that mu n = 1350 cm/V.S, Mp 480 cm²/V.s and q = 1.6 x 10-19 C A) A potential difference of 2 V is applied across the 2 ends of an n-type piece of silicon of length 10 um . Calculate the velocity of electrons and holes in this material.

Exercises 1. A silicon p-n junction has the hole and electron resistivity are 0.001 .m, 0.004 .m respectively in T-250 °K. The intrinsic carrier density is 6.2×10¹0 m³, the electron and hole diffusion length are 1.8×104 m, 1.1×104 m respectively, and th=8 µs. Find reverse saturation current density. 2. Given a Si diode with the following physical ch/s the doping concentration in the p-type is 2.25×10¹7 cm³ and in the n-type is 2.25×10¹4 cm³, junction area is 2×10³ cm², life time of hole in n-region=10 µs, life time of electron in p-region =50 µs, hole and electron mobilities are 600 cm³V's¹ and 2100 cm²V¹s¹ respectively, the intrinsic carrier concentration is 1.4x100 cm³ and the voltage is 0.66 v operation at room temperature. Calculate Jp(0) and Jn(0) then calculate the total diode current. 3. A silicon p-n junction has energy of C.B. and V.B. are 0.9 eV, 0.1 eV respectively at 200 K. the hole and electron mobility, resistivity are 0.16 m²/V.s, 0.36 m²/V.s, 0.0025 92.m and 0.005 2.m.…

Z=0