Abstract
Shallow thermal donors (STD) are electrically active, oxygen-related, thermally formed defects observed in silicon after annealing between 300 and 600 °C. There are experimental indications that STD’s might be related to nitrogen. EPR studies find C2v symmetry for such defects. Recently, theoretical investigation on an NO complex has shown that it is a shallow donor. We discuss the possibility of adding an oxygen interstitial to the NO complex. By using semi-empirical cyclic cluster model calculations, two metastable structures have been found. One of these has C2v symmetry. The approximate spin distributions are reported for both of them.
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