Effects of a photonic nanostructure on light emission of silicon

点击翻译按钮获取中文摘要

We have introduced a photonic crystal (PC) into a silicon (Si) slab to manipulate the light emission. Our study demonstrates that the light extraction is improved by a factor of ~50 in a defect-free PC. In addition, introducing a nanocavity into the PC can enhance the emission by up to a factor of ～300 by improving also the objective coupling and the internal quantum efficiencies. We also found that phonon accumulation in the tiny space will be a key for enhanced light emission in addition to the cavity effect for photons. Finally, we propose and demonstrate the application of high-pressure water vapor annealing (HWA) to Si PC nanocavities for surface passivation. We found that HWA boosts light emission due to the reduction of surface recombination beyond simply using the cavity effect.