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(a) What fraction of the surface centers at E = FN , E = Ej, and E = Fp will be filled for the specified steady-state situation? (Let filled be the number of filled surface centersper eV-cm2 at E. The fraction of filled surface centers is then filled/DIT.) Sketch filled/DIT versus E for Ev ≤ E ≤ Ec • Assume Cns = cps for all E in this part of the problem.
(b) Defining Rs = s*?ps, obtain an approximate closed-form expression for s* involving only ?E ≡ FN - Fp and the parameters Cns"cps, and D1T evaluated at midgap. Invoke and record all reasonable assumptions and simplifications needed to complete this problem.
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