Single-Electron Logical Operation Element with Nanogap and Gate Control
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Solution Overview
Problem
A three or more input logical operation element using a single electron transistor has not been realized yet.
Innovation Solution
A method of controlling gate voltages of a logical operation element with one electrode and another electrode having a nanogap, a metal nanoparticle adsorbed on self-assembled monolayers surrounded by alkanethiols, and three or four gate electrodes for adjusting the charge of the metal nanoparticle, where specific voltage differences are applied to the gate electrodes to achieve logical operations such as XOR and XNOR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single electron transistor is used, then the device can function as a transistor, but it cannot perform three or more input logical operations
Solution Approach 1:
The patent applies multi-functionality by enabling a single electron transistor to perform multiple logical operations (XOR, XNOR, and other three-input or four-input logical operations) through different gate voltage control methods. The same physical device structure is used universally for various logical functions by adjusting the voltage applied to the gate electrodes, eliminating the need for different device structures for different logical operations.
Solution Approach 2:
The patent changes the electrical parameters (gate voltages) to achieve different logical operations. By varying the voltage levels applied to the gate electrodes according to specific control methods, the transistor can switch between different logical operations without any physical structural changes, thus resolving the contradiction between versatility and device complexity.
2Adaptability or versatility
If multiple gate electrodes are added to enable three or four input logical operations, then logical operation capability is improved, but device complexity increases
Solution Approach 1:
The patent uses a unified electron transistor structure with gate electrodes that can universally perform various three-input or four-input logical operations. The same device structure with its gate electrodes serves multiple logical functions through different voltage control schemes, avoiding the need for separate specialized structures for each logical operation type.
Solution Approach 2:
The patent introduces dynamic control of gate voltages to enable the static device structure to perform multiple logical operations. By dynamically adjusting the voltage levels on the gate electrodes according to different control methods, the device adapts its functionality without any physical reconfiguration, thus achieving high versatility with minimal structural complexity.
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
Enables the performance of various logical operations like XOR and XNOR with a single element by controlling the charge of the metal nanoparticle, allowing for three or four input logical operations.
Implementation Method 1
a difference between the first voltage and the second voltage corresponds to a voltage difference ΔV divided by two, three or four, wherein the voltage difference ΔV is a voltage difference between a gate voltage to provide a peak current in a cycle of a Coulomb oscillation
Implementation Method 2
the gold nanoparticle with particle diameter of 1.8 nm functioned as Coulomb island at ambient temperature
Implementation Method 3
a metal nanoparticle adsorbed on the self-assembled monolayers at a position between the one electrode and the other electrode and surrounded by alkanethiols that chemically bond with straight chain of the molecules that construct the self-assembled monolayers
Implementation Method 4
self-assembled monolayers provided on the one electrode and the other electrode
Implementation Method 5
an insulating layer consisting of Al 2 O 3 which insulates the one electrode, the other electrode and the metal nanoparticle
Data Source
Figure 1(A)~1(B)
Figure 2
Figure 3(A)~3(C)
AI summary
Provided is a logical operation element that performs logical operations on three or more inputs using a single unique device. The logical operation element 30 is provided with an electrode 5A and the other electrode 5B that are provided to have a nanogap, a metal nanoparticle 7 arranged between the electrode 5A and the other electrode 5B in insulated state, and a plurality of gate electrodes 5C, 5D, 11, 11A, 11B for adjusting a charge of the metal nanoparticle 7. Electric current that flows between the electrode 5A and the other electrode 5B is controlled in accordance with the voltage applied to three or more of the gate electrodes 5C, 5D, 11, 11A, 11B.