Ion Beam Epitaxial Crystallization With In-Situ Vacuum Processing
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Solution Overview
Problem
Existing semiconductor fabrication methods face challenges in transforming amorphous or polycrystalline films into high-quality single-crystal materials without introducing defects or requiring high-temperature annealing, which can damage complex integration schemes and limit fabrication flows.
Innovation Solution
A method involving a semiconductor cluster tool with integrated plasma treatment and ion implantation chambers maintains vacuum conditions to sequentially remove native oxide layers, deposit film layers, and perform ion beam-induced epitaxial crystallization, all without breaking vacuum, thereby enabling the formation of high-quality crystalline films at lower thermal budgets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature annealing is used to transform amorphous or polycrystalline films into single crystals, then epitaxial growth is facilitated, but thermal damage occurs to metal interconnects and complex integration schemes
Solution Approach 1:
The patent changes the fundamental parameter from thermal energy to ion beam energy for inducing crystallization. By using ion beam-induced epitaxial crystallization (IBIEC) instead of thermal annealing, the process achieves single-crystal transformation at low temperatures, avoiding thermal damage to metal interconnects while maintaining crystal quality through ion beam energy deposition.
Solution Approach 2:
The patent replaces the thermal field (heat treatment) with an ion beam field to achieve crystallization. The ion beam delivers energy directly to the film atoms, inducing epitaxial crystallization without the need for high-temperature thermal fields, thus substituting a mechanical/physical process for a thermal process.
2Use of energy by stationary object
If ion implantation is performed at room temperature, then thermal budget is reduced, but epitaxial crystallization efficiency decreases
Solution Approach 1:
The patent optimizes the ion beam parameters (energy, dose, incidence angle) to achieve efficient epitaxial crystallization at low substrate temperatures. By carefully controlling the ion beam energy deposition rate and total dose, the process maintains high crystallization efficiency while keeping the thermal budget low, as the ion beam energy directly drives the crystallization rather than relying on thermal diffusion.
3Adaptability or versatility
If multiple separate processing steps are used for oxide removal, film deposition, and crystallization, then process flexibility is maintained, but process complexity and cost increase
Solution Approach 1:
The patent combines oxide removal, film deposition, and epitaxial crystallization into a single integrated process sequence performed in-situ without breaking vacuum. The ion beam process serves multiple functions: it removes oxides, deposits the film, and induces crystallization in one unified treatment, reducing process complexity while maintaining flexibility through parameter adjustment.
Solution Approach 2:
The patent maintains continuous vacuum conditions throughout the entire process sequence, eliminating the need for chamber evacuation and re-pumping between steps. The ion beam treatment continuously performs oxide removal, film deposition, and crystallization in an unbroken sequence, maximizing process efficiency and reducing complexity while preserving adaptability through real-time parameter control.
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 reduces process complexity and cost by eliminating the need for high-temperature annealing, allowing integration with metal interconnects and improving film quality while maintaining the integrity of semiconductor devices.
Implementation Method 1
ion beam-induced epitaxial crystallization
Implementation Method 2
epitaxial growth from an underlying single-crystalline interface
Implementation Method 3
performing a first plasma treatment on a semiconductor substrate to remove a native oxide layer
Implementation Method 4
depositing a film layer over the upper surface by performing a second plasma treatment
Data Source
AI summary
Disclosed herein are methods and systems for epitaxial crystallization on an integrated processing architecture. In some embodiments, a method may include performing a first plasma treatment on a semiconductor substrate to remove a native oxide layer along an upper surface of the semiconductor substrate, and forming a film layer over the upper surface by performing a second plasma treatment on the semiconductor substrate. The method may further include performing an ion implantation process to crystallize the film layer, wherein the implant process comprises delivering an ion species to the film layer while the semiconductor substrate is at a temperature greater than 100° C.