Experimental verification of interaction mechanism between adjacent semiconductor nanoparticles and their optical functions

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560015
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Applied materials science/Crystal engineering
• Research Institution: Osaka City University
• Principal Investigator: KIM DAEGWI 大阪市立大学, 大学院工学研究科, 教授 (00295685)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: ナノ粒子 / 積層構造 / 共鳴相互作用

Outline of Final Research Achievements

Semiconductor quantum dot (QD) superlattices, which are periodically ordered three dimensional (3D) array structures of QDs, are expected to exhibit novel photo-optical properties arising from the resonant interactions between adjacent QDs. Since the resonant interactions such as long-range dipole-dipole Coulomb coupling and short-range quantum resonance strongly depend on inter-QD nano-space, precise control of the nano-space is essential for physical understanding of the superlattice. Here, we have investigated the pure quantum resonance in the 3D QD superlattice deposited by a layer-by-layer assembly of positively charged polyelectrolytes and negatively charged QDs. The lowest excitation energy decreases exponentially with decreasing the nano-space between the QD layers and also with decreasing the QD size, which is apparently indicative of the quantum resonance between the QDs rather than a dipole-dipole Coulomb coupling.

Free Research Field

ナノマテリアル工学