where r is the electron-donor distance. The barrier height K0 is obtained from a fixed ratio of the bandgap discontinuity. According to hydrogenic mass theory, the Hamiltonian for the donor is

It is written in a dimensionless form so that all energies are measured in units of the effective Rydberg R*y and all distances are measured in units of effective Bohr radius a*B. w is equal to 1.

In order to solve the Schrodinger-like equation a0° = 1 a!'' = -

In the region r0 < r, we can obtain a normal solution [93]. It approaches zero at r = to and is found in the form

0 0

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