Violation of selection rules for parity-forbidden optical intracenter transitions in crystalline silicon: substitutional versus interstitial defects

Kurzfassung

The results show unambiguous correlation of the enhancement of detected parity-forbidden transitions with substitutional carbon. In contrast, no such enhancement has been observed due to interstitial oxygen, up to 7×10^17 cm^-3. The best trade-off concentrations of defects providing the largest transition’ intensity contrast together with the necessary spectral resolution of impurity lines is (3-7)×10^15 cm^-3 for a dominant donor and (1-3)×10^16 cm^-3 for carbon.