ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
1/1
0/0

A Tale of Seemingly “Identical” Silicon Quantum Dot Families: Structural Insight into Silicon Quantum Dot Photoluminescence

preprint
revised on 14.02.2020 and posted on 17.02.2020 by Alyxandra Thiessen, Lijuan Zhang, Anton Oliynyk, Haoyang Yu, Kevin O'Connor, Alkiviathes Meldrum, Jonathan G.C. Veinot

Two quantum dots, both alike in composition, but differing in structure, where we lay our scene. From broader classes, to bring deeper understanding, to the crystalline core that drives the quantum dot's sheen. In this contribution we examine two families of silicon quantum dots (SiQDs) that bring to mind the Capulets and the Montagues in Shakespeare’s Romeo and Juliet because of their stark similarities and differences. SiQDs are highly luminescent, heavy-metal-free and based upon earth-abundant elements. As such, they have attracted attention for far reaching applications ranging from biological imaging to luminescent solar concentrators to light-emitting diodes that rely on their size-dependent optical response. Unfortunately, correlating SiQD “size” to their photoluminescence maximum is often challenging. Herein, we provide essential structural insight into the correlation of SiQD dimension and PL maximum through a direct comparison of samples that exhibit statistically identical physical dimensions (dTEM) and chemical compositions, but different crystallite size (dXRD) and PL maxima. We then expand the scope of this investigation and systematically compare groupings of SiQDs: one in which the dXRD and dTEM agree and one where dXRD < dTEM. This latter comparison clearly shows dXRD better predicts SiQD optical response when using the well-established effective mass approximation.

Funding

NSERC Discovery Grant (RGPIN-2015-03896)

NSERC CREATE-IRTG for the Alberta/TUM International Graduate School for Hybrid Functional Materials

Natural Sciences and Engineering Research Council

Find out more...

History

Email Address of Submitting Author

aarbo@ualberta.ca

Institution

University of Alberta

Country

Canada

ORCID For Submitting Author

0000-0001-9978-1422

Declaration of Conflict of Interest

No conflict of interest

Exports