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resonance enhancement of photoluminescence from silicon nanocrystallites

An interaction of molecular oxygen and p‐Si nanocrystallites in HF–ethanolic solution with simultaneous illumination has been investigated. It is shown that after such treatment with white‐light exposure the photoluminescence from nanocrystallites enhances substantially caused by photogenerated singlet forms of molecular oxygen. In the case of monochromatic illumination with photon energy in the range 2.5–0.95 eV dependence of photoluminescence intensity after the treatment on photon energy used shows resonant peaks corresponding to the absorbance peaks of excited molecular oxygen. To our knowledge such photoluminescence peaks in porous silicon spectroscopy have been observed for the first time. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)