Band-Gap Tunability in Partially Amorphous Silicon Nanoparticles Using Single-Dot Correlative Microscopy.

ABSTRACT: Silicon nanoparticles (Si-NPs) represent one of many types of nanomaterials, where the origin of emission is difficult to assess due to a complex interplay between the core and surface chemistry. Band-gap tunability in Si-NPs is predicted to span from the infrared to the ultraviolet spectral range, which is rarely observed in practice. In this work, we directly assess the size dependence of the optical band gap using a single-dot correlative microscopy tool, where the size of the individual NPs is measured using atomic force microscopy (AFM) and the optical band gap is evaluated from single-dot photoluminescence measured on the very same NPs. We analyze 2-8 nm alkyl-capped Si-NPs prepared by a sol-gel method, followed by annealing at 1300 °C. Surprisingly, we find that the optical band gap

SUBMITTER: Huang CC 

PROVIDER: S-EPMC7836094 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature