Observation of a photoinduced lattice relaxation in CdTe : In

The local atomic structure of CdTe:In at an In concentration of 6 at. % was investigated by x-ray absorption spectroscopy before and after photoexcita tion at 80 K. After photoexcitation, In K edge spectra change in both the n ear-edge and x-ray absorption fine structure (XAFS) regions, showing a chan ge in local structure. Cd and Te structural parameters are consistent with the structure of CdTe and did not change after photoexcitation. For In, onl y the first shell contribution is present in the XAFS, indicating a disorde red environment beyond the first shell of neighbors. The relation of these observations with the proposed model of a DX center for CdTe:In is discusse d.