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Further evidence for the C-line pseudodonor model in irradiated Czochralski-grown silicon.

Photocurrent spectroscopy and photothermal ionization spectroscopy have been performed on electron-irradiated Czochralski-grown silicon. Two series of lines are observed, one starting with the C line at 790 meV, and another starting at about 30 meV higher energy. The lines are shown to belong to the same continuum, indicating that they are all associated with the same center. A continuum is also observed, and in this part of the spectrum Fano resonances are seen. The analysis of these resonances implies that the free-carrier states couple with an f TO phonon, and this confirms the view that the center is donorlike.