1. Given the E-k diagram for an unknown compound semiconduct…

1. Given the E-k diagram for an unknown compound semiconductor below, (a) Is this material a direct or indirect bandgap semiconductor? (b) Extracting the bandgap and comparing this to the table on the formula sheet, what material should this be? (c) Why does decreasing Z (ex: going from InP to AlP) result in a larger bandgap?

3. I have the following device stack (bottom to top): an n-t…

3. I have the following device stack (bottom to top): an n-type substrate, 5nm n++ epilayer (doping level: 2E20 cm-3), top metal contact. You are told that the semiconductor is GaAs (c = 4.07 eV) and the top contact metal is gold (fM = 5.3 eV), and you can easily contact the substrate. Given this information and the chart, sketch the IV curve for this structure.