Nonthermal Plasma Synthesis of Core/Shell Quantum Dots: Strained Ge/Si Nanocrystals

• DOI: 10.1021/acsami.6b16170
• Publication Date: 2017-02-07T15:51:53Z
• Authors: Katharine I. Hunter; Jacob T. Held; K. Andre Mkhoyan; Uwe R. Kortshagen
• Keywords: Dispersity; Channelling

In this work, we present an all-gas-phase approach for the synthesis of quantum-confined core/shell nanocrystals (NCs) as a promising alternative to traditional solution-based methods. Spherical quantum dots (QDs) are grown using single-stage flow-through nonthermal plasma, yielding monodisperse NCs, with concentric structure confirmed by electron microscopy. The in-flight negative charging NCs plasma electrons keeps NC cores separated during shell growth. success gas-phase is demonstrated here through study Ge/Si QDs. We find that epitaxial growth Si on Ge QD core compressively strains lattice and affords ability manipulate band modulation dimensions. This offers effective method produce high-quality heterostructured control over