Shadow Structure Substrate for Quantum Device Nanostructure Growth
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Solution Overview
Problem
Current methods for fabricating hybrid semiconductor-superconductor nanostructures face challenges in achieving high-quality interfaces and selectively removing superconducting materials without damaging the semiconductor, particularly for materials like niobium-based alloys and tantalum, which limits their exploration and device performance.
Innovation Solution
The development of specially designed substrates with shadow structures that allow for in-situ growth and patterned deposition of nanostructures, enabling precise control over material deposition and avoiding contamination, by using vertically offset shadow structures to create masks during the growth and deposition processes, maintaining ultra-high vacuum conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If selective removal processes are used to remove superconductor material, then the superconductor can be removed from the semiconductor, but the semiconductor is damaged and device performance is degraded
Solution Approach 1:
The patent extracts the problematic selective removal process entirely by using shadow structures during deposition to define the superconductor pattern directly, eliminating the need for subsequent removal steps that damage the semiconductor
Solution Approach 2:
The shadow structures are prepared in advance on the substrate before nanostructure growth, pre-defining the patterns that will be deposited without requiring post-growth removal processes
2Ease of manufacture
If ex-situ processing is used to remove superconductor, then the superconductor can be selectively removed, but the nanostructures become contaminated
Solution Approach 1:
The patent merges the pattern definition function into the deposition process itself by incorporating shadow structures, combining what were previously separate steps (pattern definition and material deposition) into a single in-situ process that avoids contamination
Solution Approach 2:
The shadow structures serve dual purposes: they define the nanostructure growth patterns and simultaneously serve as masks during deposition, making the system self-sufficient and eliminating the need for separate ex-situ processing steps
3Ease of manufacture
If conventional substrates are used for growth, then the growth process is simple, but patterned growth with precise control is difficult
Solution Approach 1:
The substrate surface is segmented into distinct functional zones by the shadow structures, creating separate regions that control different aspects of the growth and deposition processes with high precision
Solution Approach 2:
The shadow structures act as intermediary elements between the substrate and the deposited materials, mediating the deposition process to achieve precise patterning while maintaining simple growth conditions
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 ensures the formation of high-quality, clean interfaces and allows for the growth of hybrid nanostructures with hard superconducting gaps, reducing device-to-device variations and enabling the exploration of previously challenging superconductor-semiconductor combinations.
Implementation Method 1
the shadow structure can form a shadow mask on the nanostructure, such that material from the deposition source is not deposited on one or more selected surface areas on the nanostructure defined by the resulting shadow mask from the shadow structure
Implementation Method 2
During deposition of material on the nanostructure, e.g. by means of a directional beam flux, for example from a deposition source
Data Source
AI summary
The present disclosure relates to a method for manufacturing of specially designed substrates for growth of nanostructures and patterned growth on said nanostructures. The present disclosure further relates to nanostructures, in particular hybrid semiconductor nanostructures with patterned growth of superconducting material for use in quantum devices. The presently disclosed method can be utilized for in-situ manufacturing of quantum devices that have not been contaminated by ex-situ processes.