Selective Metal Oxide Deposition for Plasma-Free Semiconductor Layers
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Solution Overview
Problem
Current semiconductor manufacturing processes face challenges in selectively depositing metal oxide layers with high electrical quality and etching resistance, particularly in reducing the need for patterning and etching steps, while maintaining compatibility with sensitive materials.
Innovation Solution
The method involves cyclic vapor deposition using heteroleptic metal precursors with cyclopentadienyl and amidinato ligands, combined with oxygen precursors, to selectively deposit metal oxide layers such as yttrium oxide and yttrium-doped aluminum oxide on semiconductor substrates, allowing for controlled threshold voltage shifting and etch stop layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plasma-enhanced vapor deposition is used to deposit metal oxide layers, then the electrical properties and etching resistance of the deposited layers are improved, but the compatibility with sensitive materials deteriorates
Solution Approach 1:
The patent changes the deposition method from plasma-enhanced to thermal vapor deposition, altering the process parameters (temperature, pressure, precursor delivery) to achieve compatible deposition conditions that protect sensitive materials while still forming quality metal oxide layers
Solution Approach 2:
The patent replaces the plasma-enhanced deposition mechanism with a thermal vapor deposition mechanism, substituting the plasma field with controlled thermal processes and precursor chemistry to achieve deposition without plasma-related damage to sensitive materials
2Manufacturing precision
If conventional patterning methods are used to deposit different materials, then the deposition precision is maintained, but the number of processing steps increases
Solution Approach 1:
The patent employs a universal thermal vapor deposition process that can deposit multiple different metal oxide materials using the same equipment and process parameters, eliminating the need for separate plasma processing lines and reducing the number of processing steps while maintaining deposition precision
Solution Approach 2:
The patent combines multiple deposition operations into a single thermal vapor deposition process, merging what would traditionally require separate plasma-enhanced deposition steps into one unified process that achieves the same material deposition goals with fewer steps
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 enables the deposition of high-quality metal oxide layers with reduced etch rates and improved electrical properties, enhancing the scalability of semiconductor devices and reducing processing steps, thereby improving the efficiency and reliability of integrated circuits.
Implementation Method 1
depositing the metal oxide layer on the first surface of the substrate by a cyclic vapor deposition process; wherein the vapor deposition process comprises providing a first metal precursor into the reaction chamber in a vapor phase
Implementation Method 2
providing an oxygen precursor into the reaction chamber in a vapor phase
Data Source
AI summary
The disclosure relates to methods and processing assemblies selectively depositing metal oxide by cyclic vapor deposition techniques. Such methods may be used for, for example, processing semiconductor substrates. More particularly, the disclosure relates to methods and assemblies for selectively depositing a metal oxide layer. Various embodiments of the current disclosure relate to selective deposition of metal oxide layers, such as dielectric layers, etch stop layers and threshold voltage shifting layers. In particular, the disclosure relates to the deposition of metal oxide layers, such as yttrium oxide (Y2O3), and doped metal oxide layers, such as yttrium-doped aluminum oxide (AlYOx) by cyclic vapor deposition processes.