Silicon nanocrystals dispersible in polar solvents without organic capping

2014 Fiscal Year Final Research Report

• Project/Area Number: 24651143
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Nanomaterials/Nanobioscience
• Research Institution: Kobe University
• Principal Investigator: FUJII Minoru 神戸大学, 工学(系)研究科(研究院), 教授 (00273798)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: シリコンナノ結晶 / コロイド / 不純物 / ドーピング

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.

Free Research Field

ナノ材料物性