An unknown material is transparent to light of frequencies (v) up to 1.3 x 10¹4 s¹. Draw a meaningful schematic band structure for this material. Label Band gap energy in eV. (1eV=1.6x10-19 J)

We have a piece of Si (shown below) with dimensions 50 um x 200 um x 0.25 um. The Silicon is doped uniformly with ND = 1014 cm3. What is the resistance of the slab when measured along the length (200 um)? %3| If a light with photonic energy greater than the bandgap of Si were to be shone from the top surface such that it produces uniform hole-electron pairs Ap =An = 5E12 cm-3 throughout the slab, what would be the ratio of the illuminated conductivity vs the dark conductivity? What is the ratio of conductivity due to holes vs the conductivity due to electrons under illumination? How about in the dark? 200 Nm

Graph below shows the electron occupancy probability P(E) as a function of energy for Bismuth (mBi = 3.47 × 10-25 kg) at the temperature T = 0 K. What is the number of conduction electrons per unit volume for Bismuth? 1 1 2 3 4 5 6 7 8 E (ev) P(E)

An LED emits light with a wavelength of 500 nm (500x10-9m). What is the band gap energy in electron Volts? Hint: recall Eq. (2) and 1 eV= 1.6 x10-19 J 1.2 eV 2.5 eV 3.3 eV 4.1 eV 5.5 eV