Oxide Semiconductor Surface Purification by Interstitial Oxygen Diffusion
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Solution Overview
Problem
Current methods for achieving high isotopic and chemical purity in semiconductors are limited by the expense and difficulty of obtaining raw materials with sufficient purity, and existing post-synthesis purification techniques are inefficient for removing impurities from semiconductor surfaces, particularly for applications in thermal management, quantum computing, and sensing.
Innovation Solution
A method involving the injection of atomic oxygen or metal cations into treated semiconductor surfaces, creating interstitial atoms that diffuse through the material, effectively 'snowplowing' impurities from the surface region to a deeper accumulation area, utilizing aqueous solutions and controlled conditions such as pH, bias voltage, and UV irradiation to enhance the purification process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If raw materials with high isotopic purity are used, then isotopic purity of the semiconductor is improved, but cost and difficulty of obtaining materials increase
Solution Approach 1:
The patent applies preliminary action by performing isotopic purification through interstitial injection after semiconductor synthesis but before final device fabrication. This post-synthesis purification approach allows standard materials to be used initially, then purified in place, avoiding the need to obtain expensive pre-purified raw materials while achieving the required isotopic purity for quantum applications
Solution Approach 2:
The patent uses interstitial atoms (such as oxygen interstitials) as intermediaries to facilitate isotopic purification. These interstitials act as mediators that enable selective diffusion and removal of unwanted isotopes from the semiconductor lattice through controlled injection and diffusion processes, achieving purification without requiring expensive pre-purified materials
2Manufacturing precision
If conventional post-synthesis purification techniques are used, then some impurity removal is achieved, but purification efficiency is insufficient for achieving high isotopic purity
Solution Approach 1:
The patent applies parameter changes by controlling temperature, interstitial concentration, and diffusion time to optimize purification efficiency. By adjusting these parameters, the process achieves high isotopic purity removal rates that conventional techniques cannot attain, making the purification both efficient and effective for quantum applications
Solution Approach 2:
The patent replaces conventional mechanical or chemical purification methods with a diffusion-based mechanism driven by interstitial injection. This substitution enables selective isotope removal through controlled atomic diffusion processes, achieving purification efficiencies and purity levels that traditional methods cannot reach
3Manufacturing precision
If surface treatment is applied to enhance interstitial injection, then purification effectiveness is improved, but process complexity increases
Solution Approach 1:
The patent applies preliminary action by preparing the semiconductor surface through treatment methods such as plasma exposure or chemical etching before interstitial injection. This preliminary surface preparation enhances subsequent interstitial injection effectiveness by creating favorable surface conditions, while the treatment steps are integrated into the overall fabrication process to minimize added 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
This approach achieves significant isotopic and chemical purification, reducing impurity concentrations near the surface by up to three times below natural abundance levels, enabling improved performance in electronic and optoelectronic devices and tailored semiconductors for thermal management and quantum applications.
Implementation Method 1
the atomic oxygen or metal cations moving through the crystalline metal oxide as interstitials
Implementation Method 2
a portion of the water adsorbs onto the treated surface and dissociates into the atomic oxygen and hydrogen
Implementation Method 3
exposing the treated surface to UV light or other above-gap radiation, the above-gap radiation having a photon energy at or above a bandgap of the crystalline metal oxide
Data Source
AI summary
A purified surface region of a semiconductor includes a treated surface and comprises a crystalline metal oxide containing an impurity species (e.g., an isotopic impurity or a chemical impurity). The crystalline metal oxide comprises a depletion region extending to a first depth from the treated surface, and an accumulation region adjacent to the depletion region and extending to a second depth greater than the first depth. A concentration of the impurity species is lower in the depletion region than in the accumulation region. An electronic component comprising the purified surface region may be used for thermal management, quantum computing, sensing, and/or light detection.