24 20 5.15P) Review a)Figure shows position of the three conduction band minima of Al G21- x,As structure as x changes. I is direct band and X indirect band. (Valance band maximum is 0 eV). For the value of x=0.6 which band do you prefer for to make a photodiode. Why? What should be the wavelength range for this photodiode? b)Plot the plane surfaces given Miller indices of (1 10) and (5 2 3) calculate the surface vector of the surface.(the lattice constant is a) 18 1.4 A