The local atomic structure of CdTe:In at an In concentration of $6\mathrm{at}.\mathrm{}\%$ was investigated by x-ray absorption spectroscopy before and after photoexcitation at 80 K. After photoexcitation, In $K$ edge spectra change in both the near-edge and x-ray absorption fine structure (XAFS) regions, showing a change in local structure. Cd and Te structural parameters are consistent with the structure of CdTe and did not change after photoexcitation. For In, only the first shell contribution is present in the XAFS, indicating a disordered environment beyond the first shell of neighbors. The relation of these observations with the proposed model of a $\mathrm{DX}$ center for CdTe:In is discussed.

• Received 26 April 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.3446