Optical absorption spectra of magnesium-implanted GaP

Optical absorption spectra of magnesium-implanted GaP single crystals are measured in the photon energy range below the fundamental edge. It is found that implantation results in the formation of exponential absorption tails with tailing energies up to about 0.8 eV and absorption coefficients up to about 10⁵ cm⁻¹ at 2.0 eV. The results are compared with optical measurements on GaP single crystals implanted with other ions and with optical absorption data of amorphous GaP.