Effects of Electron-Hole Correlations on Radiative Recombination of Donor-Acceptor Pairs in Polar Semiconductors
A variational calculation of the effective-mass electronic states is presented for donor-acceptor (DA) pairs including electron-hole correlations and electron-phonon interactions. The calculations are carried out for unequal electron and hole effective masses. Expressions for the energy levels are obtained in terms of integrals containing trigonometric functions. The variational parameters for the orbital radii and for the electron-hole correlation are determined as a function of the D-A distance. The theory is applied to the zero-phonon spectra of D-A pairs in GaP and in ZnSe and a comparison is made with previous theoretical works. The contribution due to electron-hole correlation increases at small D-A distance and is found to be about 10 meV for GaP.
KeywordsRadiative Recombination Adiabatic Approximation Orbital Radius Pair Distance Pair Energy
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