a) Using the mobility and carrier density, calculate the conductivity of Ag and Si. b) What fraction of conductivity in Si is due to holes and what fraction due to electrons? a) Calculate charge carrier density in Cu (#Cu/m^3 x 2e/Cu). Use conductivity of Cu to determine electron mobility. Using the information from the adjacent graph, determine the ratio of conductivity for silicon at 125C compared to conductivity at 25C (room temperature). Describe the reasons for the differences in conductivity between metals and semiconductors and insulators and sketch band diagrams to illustrate your reasons. Solve the preview problem on the next page which will help prepare you for the next class on extrinsic semiconductors. From the selection bank fill in blanks 1 -4. Reference Callister 18.11: pp. 741-744
