| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
Colloidal silicon (Si) nanocrystals have been attracting significant attention as a precursor for a future printable electronics and in biomedical applications. In this project, we will develop Si nanocrystals that can be dispersed in polar solvents without organic capping. We have succeed in developing boron (B) and phosphorus (P) co-doped Si nanocrystals and found that the co-doped nanocrystals can be dispersed in polar solvents without any surface functionalization processes. From detailed structural analyses, we showed that the surface of co-doped nanocrystals are covered by high B and P concentration shells and the shells induce negative potential, which prevent agglomeration of nanocrystals by electrostatic repulsions. We succeeded in controllingl the size of nanocrystals from 1 to 14 nm, which resulted in very wide tunable range of the luminescence energy (0.85-1.85 eV). We also succeeded in producing high quality Si nanocrystal solids by spin-coating colloidal solutions.
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