Superconducting Device Stress Reduction Dummy Elements
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Solution Overview
Problem
CMOS-based semiconductor devices face limitations in device size and high power consumption due to leakage current, even when inactive, leading to significant energy wastage in applications like data center servers.
Innovation Solution
The development of superconducting devices using reciprocal quantum logic (RQL) circuits with Josephson junctions and strain reservoir structures to mitigate thermal expansion mismatch issues, enabling zero static power dissipation and reduced stress at metal-dielectric interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CMOS technology is used for semiconductor devices, then device integration is achieved, but leakage current causes high power consumption even when inactive
Solution Approach 1:
The patent replaces the conventional CMOS electronic switching mechanism with a superconducting quantum interference device (SQUID) based logic system. This substitution eliminates resistive power loss by using quantum interference effects in superconducting loops to perform logical operations, achieving zero static power dissipation while maintaining computational functionality.
Solution Approach 2:
The invention changes the fundamental operating parameters from conventional voltage-based CMOS switching to magnetic flux-based superconducting quantum interference. By operating at cryogenic temperatures and utilizing quantum mechanical effects, the system achieves dramatically reduced power consumption while maintaining device integration capability.
2Reliability
If multi-metallic wiring layers are used in superconducting circuits, then resistance to impurity diffusion and surface passivation are improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs multi-metallic composite wiring structures where different metal layers are stacked to provide complementary functions. The niobium layer provides superconductivity, while the tungsten layer provides mechanical stability and stress management. This composite approach enhances impurity diffusion resistance and surface passivation while the standardized fabrication process keeps manufacturing complexity manageable.
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
RQL circuits achieve zero static power dissipation and eliminate ground return current by using AC power, while strain reservoirs reduce mechanical stress, enhancing the performance and reliability of superconducting devices.
Implementation Method 1
superconducting devices using reciprocal quantum logic (RQL) circuits with Josephson junctions
Implementation Method 2
strain reservoir structures to mitigate thermal expansion mismatch issues, reducing mechanical stress
Implementation Method 3
superconducting devices using reciprocal quantum logic (RQL) circuits
Data Source
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AI summary
The proposed superconducting device, compatible with reciprocal quantum logic (RQL) Josephson junction circuits, includes a superconducting element having a first coefficient of thermal expansion formed on a dielectric layer having a different second coefficient of thermal expansion, and at least one dummy element configured to lower stress at an interface between the superconducting element and the dielectric layer when operating in a cryogenic environment. Preferably, the superconducting element is a Nb wire (110, 120, 130, 150) on a SiO2 layer (104), and the dummy elements are protruding nubs (112, 114, 116, 122, 124), passive vias (134, 136) below, or surface features (152) on top of the wire.