An anneal around 650°C for a long duration introduces a new type of donors (new donors)in CZ–Si crystals. We have investigated the properties of the new donors by the photoluminescence method for the first time. The introduction of the characteristic broad bands (C-type pattern) in the PL spectra shows one to one correspondence with the generation of the new donors defined by the resistivity measurements. The appearance of the C-type spectra is enhanced by the presence of a high concentration of carbon (5×10 16 cm -3 ) and/or the preanneal at 470°C.
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Tajima et al. (1980) studied this question.
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