Electroluminescence of Si Nanocrystal-Doped SiO₂

We perform a comparative study on the electroluminescence (EL) and photoluminescence (PL) of Si nanocrystal-doped SiO₂ (nc-Si:SiO₂) and SiO₂, and clarify whether the contribution from Si nanocrystals in the EL of nc-Si:SiO₂ truly exists. The results unambiguously indicate the presence of EL of Si nanocrystals. The difference of peak positions between the EL and PL spectra are discussed. It is found that the normal method of passivation to enhance the PL of Si nanocrystals is not equally effective for the EL, hence new methods need to be explored to promote the EL of Si nanocrystals.