2010 Fiscal Year Final Research Report
Effects of a photonic nanostructure on light emission of silicon
| Project/Area Number |
20760198
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Electronic materials/Electric materials
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| Research Institution | Kyoto University |
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Principal Investigator |
FUJITA Masayuki Kyoto University, 大学院・工学研究科, 講師 (40432364)
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| Project Period (FY) |
2008 – 2010
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| Keywords | シリコン / 間接遷移型半導体 / 発光 / 光ナノ構造 / フォトニック結晶 |
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| Research Abstract |
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.
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