| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Outline of Final Research Achievements |
A new method of determination of optical constants of Porous Si was shown. It is easy, allows for study of perfectly preserved materials and for the first time allows the study of all porosities. The dissolution rate of silicon in various HF-based solutions was achieved. Photo-etching of porous Si was also characterized experimentally and theoretically with a model.
Si/SiO2 core/shell nanoparticles with world record high quantum yields (53-61%) were obtained. The same method led to quantum yields of ~ 30% for porous silicon powders. These nanocrystals were very stable and exhibited the longest lifetimes ever reported for such nanocrystals. A new method of gas-phase chemical modification of nano-silicon surface to replace Si-H bonds by more stable Si-C bonds was studied using 1-hexene. This method is easy, low-cost and allows for gas pressure control. It is much more efficient than the liquid-phase one. The resulting photoluminescence of the nano-silicon layers was well-stabilized.
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