Memcapacitor Nonvolatile Memory via Dopant Redistribution
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Solution Overview
Problem
There is a long-felt need for electrical components that can retain a memory of past conditions to enable high-density data storage, circuit calibration, self-programming, fuzzy logic, and neural learning capabilities without requiring power for long-term data retention and with fast access times.
Innovation Solution
A memcapacitive device is developed, utilizing a dopant/matrix combination within an insulating or semiconducting matrix that alters electrical characteristics by redistributing dopants in response to programming electrical fields, allowing the device to 'remember' past electrical conditions through stable capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dopants are allowed to move within the matrix to dynamically alter electrical behavior, then the device can retain memory of past electrical conditions, but the device requires power to maintain dopant positions and prevent drift
Solution Approach 1:
The dopants serve themselves by being attracted to and trapped at interfaces between different dielectric materials with different dielectric constants. This self-trapping mechanism eliminates the need for external power to maintain dopant positions, as the interfaces automatically hold the dopants in place through electrostatic attraction, enabling non-volatile memory retention
Solution Approach 2:
Interfaces between dielectric materials act as intermediary trapping sites that mediate between the mobile dopants and the surrounding matrix. These interfaces provide stable anchoring positions for dopants without requiring continuous energy input, effectively transferring the memory retention function from an active power-maintained system to a passive interface-trapped system
2Power
If standard driving voltage is applied to nanometer scale devices, then large electric fields are produced to induce dopant motion, but the device complexity increases due to precise nanometer fabrication requirements
Solution Approach 1:
The invention changes the material parameter by using dielectric materials with different dielectric constants to create interfaces that naturally concentrate electric fields. This allows effective dopant manipulation at lower voltages compared to uniform dielectric structures, reducing the need for extremely precise nanometer-scale fabrication while still achieving the required field strengths for dopant motion
3Loss of time
If dopant positions are stabilized for long-term data retention, then fast access times are achieved, but the device cannot be dynamically reprogrammed without applying strong electrical fields
Solution Approach 1:
The system exhibits dynamic behavior where dopants are stable during normal operation (providing long retention time) but can be rapidly repositioned when strong electrical fields are applied (enabling reprogramming). The interfaces provide stable trapping under normal conditions while allowing controlled release and redistribution under programming conditions, achieving both stability and reconfigurability
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
The memcapacitive device effectively retains memory of past electrical conditions, enabling high-density data storage and dynamic capacitance alteration, maintaining stability over long periods without external power, suitable for applications like neural computing and fuzzy logic processes.
Implementation Method 1
the motion of dopants can be induced by the application of a programming electrical field or programming voltage pulse across the matrix
Implementation Method 2
changes in dopant positions can alter the capacitance of the device
Data Source
AI summary
A memcapacitor device (100) includes a first electrode (104) and a second electrode (106) and a memcapacitive matrix (102) interposed between the first electrode (104) and the second electrode (106). Mobile dopants (111) are contained within the memcapacitive matrix (102) and are repositioned within the memcapacitive matrix (102) by the application of a programming voltage (126) across the first electrode (104) and second electrode (106) to alter the capacitance of the memcapacitor (100). A method for utilizing a memcapacitive device (100) includes applying a programming voltage (126) across a memcapacitive matrix (102) such that mobile ions (111) contained within a memcapacitive matrix (102) are redistributed and alter a capacitance of the memcapacitive device (100), then removing the programming voltage (126) and applying a reading voltage to sense the capacitance of the memcapacitive device (100).