Elastic Strain Tuning of Defect-Doped Wide Bandgap Materials
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wide bandgap materials, such as diamond, are ineffective as semiconducting or conducting materials due to the difficulty in doping with defects that can produce charge carriers, as the energy required to ionize defects is too high for room-temperature thermal fluctuations, and the energy difference between localized electronic states and band edges is too large, preventing the formation of charge carriers.
Innovation Solution
Applying elastic strain to defect-doped materials reduces the activation energy required to ionize defects, transitioning them from a deep dopant state to a shallow dopant state, enabling the material to function as a semiconducting or conducting material by dynamically toggling between these states, effectively n-doping or p-doping materials previously considered 'undopable'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If defects are introduced into wide bandgap materials to create charge carriers, then the material can function as a semiconductor, but the activation energy is too high for thermal ionization at room temperature
Solution Approach 1:
The patent applies elastic strain to the defect-doped material to change the energy parameters of the system. Specifically, the strain modifies the band structure and defect energy levels, reducing the activation energy from a state too high for thermal ionization to a state where thermal fluctuations can ionize defects and generate charge carriers at room temperature
Solution Approach 2:
The patent enables dynamic control of the material's conductive state by applying or removing elastic strain. The material can be switched between a non-conducting state (unstrained) and a semiconducting/conducting state (strained), allowing dynamic toggling of electrical properties through mechanical deformation
2Stability of the object's composition
If the energy difference between localized electronic states and band edges is large, then the material maintains its wide bandgap properties, but thermal fluctuation energy cannot ionize defects to form charge carriers
Solution Approach 1:
Elastic strain is applied to modify the energy parameters of the material without changing its fundamental wide bandgap composition. The strain reduces the energy difference between localized defect states and band edges, enabling thermal ionization while preserving the material's wide bandgap structure and compositional stability
3Quantity of substance
If defects are doped into the material to create localized electronic states, then charge carriers can be formed, but the activation energy remains too high for room-temperature operation
Solution Approach 1:
The patent uses elastic strain to change the energy landscape for defect ionization. By applying strain, the activation energy barrier is reduced sufficiently that thermal fluctuations at room temperature can ionize defects and generate charge carriers, eliminating the need for high-temperature operation
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 allows non-conducting defect-doped materials to transition into semiconducting or conducting materials, facilitating their use in devices by reducing the activation energy needed to form charge carriers, making them suitable for applications in semiconducting devices and memory devices.
Implementation Method 1
a strain is applied to a least a portion of the defect doped material. The defect doped material may be a non-conducting material when the defect doped material is in an unstrained state, and the defect doped material may be a semiconducting material or a conducting material when the strain is applied to the defect doped material
Data Source
AI summary
Compositions and methods related to straining defect doped materials as well as their methods of use in electrical circuits are generally described.