Binding of an exciton to a donor‐acceptor pair in a semiconductor ii. binding energy and critical separation in the case of a coulomb interaction – influence of the polarization effects

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Abstract
The binding energy of an exciton to a donor–acceptor pair is calculated in the approximation of Coulomb interactions. Haken's potential is also considered to take into account the electronic and ionic polarization effects. To this aim, the variation method is applied to an electron‐hole product wave function with two adjustable parameters. The computations are made for both equal and unequal electron and hole effective masses. The results obtained compare favourably to the experimental data in ZnSe. Haken's potential is found to be suitable for donor‐acceptor separations close to the critical length, in which case the polarization effects are still important.

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