Nanostructure Assemblies Using Bridging Molecules
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Solution Overview
Problem
Current technologies face challenges in controllably assembling and configuring small numbers of nanocrystal quantum dots and other nanostructures for preparing nanoscale electronic and optoelectronic devices, as they lack precise control over mesoscopic effects such as Coulomb interactions and charge transport.
Innovation Solution
The development of methods to create well-defined assemblies of nanostructures, including nanocrystals and nanorods, using substrates with discontinuities and bridging molecules to electronically couple nanostructures, enabling the formation of field-effect transistors and other devices with precise control over charge carrier density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If nanocrystals are self-assembled using conventional drying-mediated methods, then large-scale arrays can be formed, but precise control over assembly configuration and mesoscopic effects is lost
Solution Approach 1:
The patent divides the assembly process into distinct stages: first forming a substrate with controlled discontinuities (steps, trenches, or holes), then selectively assembling nanocrystals at these discontinuity sites. This segmentation allows precise spatial control while enabling assembly of multiple nanocrystal arrays, resolving the contradiction between quantity and precision.
Solution Approach 2:
The patent introduces bridging molecules as intermediaries that attach to nanocrystal surfaces and facilitate controlled assembly at substrate discontinuities. These bridging molecules mediate between the substrate and nanocrystals, enabling precise configuration control while maintaining the ability to assemble large numbers of nanocrystals.
2Manufacturing precision
If small numbers of nanocrystals are assembled for quantum device applications, then mesoscopic effects can be controlled, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent performs preliminary actions by pre-forming substrates with specific discontinuities (steps, trenches, or holes) before nanocrystal assembly. This preliminary structuring simplifies the subsequent nanocrystal assembly process, as nanocrystals naturally accumulate at these pre-defined sites, reducing overall device complexity while maintaining precision.
Solution Approach 2:
The patent exploits the self-assembling nature of nanocrystals, which spontaneously accumulate at substrate discontinuities due to capillary forces and surface energy minimization. This self-service mechanism reduces the need for complex external manipulation, simplifying the assembly process while achieving precise control over nanocrystal positioning and mesoscopic effects.
3Productivity
If nanocrystals are assembled in dense arrays, then circuit density increases, but control over individual nanocrystal properties and charge transport is reduced
Solution Approach 1:
The patent applies local quality by creating substrate discontinuities with specific geometries (steps, trenches, or holes) that locally control nanocrystal assembly. Each discontinuity site can be optimized for specific functions, allowing dense arrays to be formed while maintaining local control over nanocrystal properties and charge transport through the bridging molecules at each site.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for the creation of nanostructure assemblies that can be used in electronic and optoelectronic devices, enabling controlled charge transport and manipulation, which is essential for advanced nanoscale devices like quantum information processing and field-effect transistors.
Implementation Method 1
NCs self-pack in either glassy arrays or ordered arrays, depending on the solvent composition and the drying parameters
Implementation Method 2
the assembly process of nanostructures such as NCs is not fully understood
Implementation Method 3
contacting the plurality of nanostructures to the substrate, wherein at least a portion of the plurality of nanostructures assemble adjacent to the discontinuity
Implementation Method 4
Examples of mesoscopic effects include, inter alia, coulomb interactions, electron tunneling, charge ordering and charge fluctuations
Implementation Method 5
at least two of the spatially assembled nanostructures are linked by one or more bridging molecules
Data Source
AI summary
Disclosed herein are methods for assembling nanostructures. The assembling methods include contacting the plurality of nanostructures to a substrate having one or more discontinuities. At least a portion of the plurality of nanostructures assemble adjacent to the discontinuity, the assembled nanostructures including at least one nanostructure having a bridging, molecule. Devices, such as field-effect transistors, are also disclosed.