Question

Question 3: During NASA's Microgravity Science Laboratory, which flew as STS - 94 aboard the space shuttle Columbia, a CWRU experiment was performed using antimon y doped germanium.

a) Calculate the number of grams of antimony that needs to be added to 100 grams of germanium if the doping level is desired to be 1x10 18 at/cm 3 .

b) Calculate the electrical conductivity of this material at 300 K given: the electron mobility in germanium is 0.1 m 2 /Vs; the hole mobility is 0.05 m 2 /Vs; the energy band gap for germanium is 0.67 eV; the density is 5.32 g/cm 3 ; and the pre - exponential constant A = 1.45975x10 15 cm - 3 K - 3/2 .

c) State the type of conduction present in this material

Answer 1