Fabricating Single Crystal Quantum Dot Solids

Technical Report · Tue Mar 14 04:00:00 EDT 2023

DOI:https://doi.org/10.2172/1961307· OSTI ID:1961307

Hanrath, Tobias ^[1]; Kourkoutis, Lena F. ^[2]; Clancy, Paulette ^[3]

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1. Cornell Univ., Ithaca, NY (United States); Cornell University
2. Cornell Univ., Ithaca, NY (United States)
3. Johns Hopkins Univ., Baltimore, MD (United States)

The central goal of this research program was to establish fundamental synthesis and processing principles to enable the fabrication of single crystal quantum dot solids (QDS) with programmable structure (i.e., hexagonal and square) and composition. Our approach towards that goal leveraged access to and experience with unique in-situ, multi-probe characterization techniques to understand and ultimately control the fundamental relationship between processing conditions and nucleation and growth of QDS. The program integrated synthesis and fabrication (Hanrath) with in-situ TEM analysis (Kourkoutis) and computational modeling (Clancy) to gain atomic-level insights into the underlying physical phenomena governing assembly and attachment and to guide the development of optimized processing methods. We have established a foundational understanding of physicochemical interactions of self-assembly at a fluid interface, superlattice structure transformation pathways, the critical role of disorder during the initial dimerization of colloidal quantum dot monomers, and the residual strain distribution within the inter-dot epitaxial bridge which hampers the formation of novel electronics states of the quantum dot solids. Collectively, these insights have contributed towards advancing the mechanistic understanding of the complex choreography of assembly and attachment as well as understanding what currently limits further advances in high-fidelity quantum dot solids and tiles.

• Research Organization: Cornell Univ., Ithaca, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• DOE Contract Number: SC0018026
• OSTI ID: 1961307
• Report Number(s): DOE-CORNELL-SC0018026
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE