Gallium Oxide Wafer Annealing for Selective Carrier Concentration

The patent divides the treatment process into two independent stages: first performing ion implantation to introduce impurities, then performing selective oxygen annealing in specific regions to activate the impurities. This segmentation allows the expensive ion implantation step to be followed by a more energy-efficient selective annealing step, reducing overall energy consumption while maintaining precise local region treatment capability.

The patent introduces a barrier layer as an intermediary element that enables selective oxygen annealing. This barrier layer is patterned to cover specific regions, allowing oxygen to reach only the exposed areas during annealing. The barrier layer acts as a mediator that controls where oxygen interacts with the implanted impurities, enabling precise local treatment without requiring continuous high-energy ion implantation throughout the process.

The patent segments the oxygen annealing process by introducing a patterned barrier layer that divides the substrate into treated and untreated regions. This allows selective region treatment during oxygen annealing, enabling the technology to be applied to specific device regions while maintaining the ability to treat different areas independently, thus preserving adaptability for various device configurations.

The patent applies local quality by creating a barrier layer with spatially varying properties - the barrier layer is present in some regions and absent in others, allowing oxygen to interact differently with the substrate in different areas. This enables selective activation of implanted impurities in specific regions while leaving other regions unaffected, achieving both selective treatment and broad applicability to different device designs.

The patent performs ion implantation as a preliminary action to introduce impurities into the substrate before performing oxygen annealing. By completing the impurity introduction step first, the subsequent oxygen annealing can focus solely on activating the already-implanted impurities without causing additional material damage, thereby improving reliability while maintaining effective impurity introduction.

The patent converts the harmful effect of high-energy ion implantation (material damage) into a beneficial two-stage process. The initial ion implantation damage is accepted as necessary for introducing impurities, but the subsequent selective oxygen annealing step is designed to activate these impurities while minimizing further damage. The barrier layer protects regions where damage should be avoided, converting the potential harm into a controlled process that achieves both impurity introduction and activation with reduced overall damage.