Trenched Bottom Electrode Molecular Devices
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Solution Overview
Problem
Current methods for fabricating molecular spintronics devices face challenges in mass production due to difficulties in using small molecules with lengths less than the insulator thickness, leading to issues with spin coherence, joule heating, and the production of atomically smooth and uniform thin insulators, which affects the performance and stability of molecular devices.
Innovation Solution
The development of Trenched Bottom Electrode and Liftoff based Molecular Devices (TBELMDs) that allow for the use of molecules with lengths smaller than the combined thickness of insulating barriers, enabling controlled charge and spin transport, and the use of multilayer ferromagnetic electrodes to create magnetic metamaterials with unique properties, such as solar cell effects, while maintaining low leakage current and long-term stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional microfabrication tools and sputtering processes are used to fabricate molecular devices, then mass production capability is achieved, but difficulty in producing atomically smooth and uniform thin insulators occurs
Solution Approach 1:
The patent changes the deposition parameters by using atomic layer deposition (ALD) instead of sputtering, and specifically controls the insulator thickness to be in the range of 0.5-2 nm. This parameter change enables achieving atomically smooth and uniform insulators that are compatible with mass production processes
Solution Approach 2:
The patent replaces the conventional sputtering process with atomic layer deposition (ALD). This substitution provides better control over thin film uniformity and smoothness while maintaining compatibility with standard microfabrication toolsets for mass production
2Adaptability or versatility
If insulator thickness is reduced to accommodate small molecules, then molecule utilization is improved, but spin coherence and device stability deteriorate
Solution Approach 1:
The patent optimizes the insulator thickness to a specific range (0.5-2 nm) that balances two competing requirements: thin enough to allow small molecules (length < 1 nm) to bridge the gap, but thick enough to maintain spin coherence and device stability. This precise parameter control resolves the contradiction
Solution Approach 2:
The patent introduces dynamic control of the insulator thickness based on the specific molecule being used. The thickness can be adjusted within the 0.5-2 nm range to match different molecule sizes and requirements, enabling both small molecule utilization and maintained spin coherence
3Length of moving object
If small molecules with length less than insulator thickness are used, then device miniaturization is achieved, but joule heating and spin coherence issues occur
Solution Approach 1:
The patent changes the insulator thickness parameter to be in the optimal range (0.5-2 nm) which reduces the electric field strength and consequently reduces joule heating in the molecular channel, while still allowing small molecules to function effectively
Solution Approach 2:
The patent uses the insulator layer as a cushioning element that prevents excessive current density and joule heating. By carefully controlling the insulator thickness, it provides a buffer that protects the small molecule channel from harmful thermal effects while maintaining device miniaturization
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
TBELMDs enable the production of molecular devices with improved spin coherence, reduced joule heating, and enhanced stability, allowing for the creation of large-area solar cells and memory devices with tunable magnetic states, and the ability to sense chemicals and light, while maintaining low leakage current and long-term stability.
Implementation Method 1
oxidizing the bottom metal electrode to form an insulating barrier
Implementation Method 2
molecules are attached to metal electrodes through self-assembly
Data Source
AI summary
A system and method for fabricating at least one of, a molecular device element and a TBELMD including depositing a first electrode material on an insulating substrate or layer, performing a photolithography process in the first electrode material, creating a trench component in the first electrode material with the photolithography process, determining a section of the electrode material to remove based on at least one of, a molecular device element and a TBELMD to be produced, removing the section of said first electrode material, oxidizing a portion of the first electrode material, creating a first insulator part from the oxidized portion of the first electrode material, in which the oxidized portion of the first electrode material includes at least a first electrode metal surface, depositing a second electrode material, and bridging the first and second electrode material.