Metal Oxide Deposition with Microwave Crystallization for 3D Memory
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Solution Overview
Problem
In semiconductor memory devices, the interface between semiconductor and insulator layers can form trap centers, leading to shifts in threshold voltage and charge leakage, affecting the reliability and storage capacity of three-dimensional memory cell arrays.
Innovation Solution
A method for depositing a metal oxide using a specific precursor sequence and microwave treatment, which includes introducing different precursors and an oxidizer in a plasma state, followed by microwave treatment, to form a crystal region with a c-axis parallel to the surface, reducing lattice defects and improving crystallinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charge extraction and injection is performed through the insulator to write data to memory cells, then data storage function is achieved, but trap centers are formed at the semiconductor-insulator interface causing threshold voltage shifts and charge leakage
Solution Approach 1:
A barrier layer is formed at the semiconductor-insulator interface before the charge accumulation layer is deposited. This preliminary structural preparation prevents direct contact between the semiconductor and the charge accumulation layer, thereby preventing trap center formation at the interface while still allowing the charge accumulation layer to function for data storage.
2Quantity of substance
If multiple memory cells are stacked to increase storage capacity per unit area, then storage density is improved, but manufacturing complexity and process steps increase
Solution Approach 1:
The barrier layer structure serves multiple functions simultaneously: it prevents trap center formation, enables effective charge accumulation, and maintains interface quality. This multi-functional design allows the same structural approach to be applied across multiple stacked memory cells, simplifying the manufacturing process for three-dimensional memory arrays while maintaining high storage density.
3Productivity
If charge is extracted and injected through the insulator repeatedly, then data writing capability is maintained, but the insulator and interface deteriorate causing charge leakage
Solution Approach 1:
The barrier layer is formed in advance to protect the semiconductor-insulator interface from degradation during repeated charge extraction and injection operations. This preliminary protective structure prevents deterioration that would otherwise lead to charge leakage, thereby maintaining both data writing capability and charge retention over extended periods.
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 results in a highly reliable memory device with increased storage capacity, reduced manufacturing steps, and lower costs, while maintaining high crystallinity and minimizing defects, thus enhancing the reliability and efficiency of semiconductor devices.
Implementation Method 1
introducing an oxidizer in a plasma state into the first chamber after each of the first step, the second step, and the third step
Implementation Method 2
a fifth step of performing microwave treatment
Implementation Method 3
the metal oxide includes a crystal region, and a c-axis of the crystal region is substantially parallel to a normal vector of a surface where the metal oxide is formed
Data Source
AI summary
A method for depositing a metal oxide is provided. The deposition method of a metal oxide includes a first step of introducing a first precursor into a first chamber, a second step of introducing a second precursor into the first chamber, a third step of introducing a third precursor into the first chamber, a fourth step of introducing an oxidizer in a plasma state into the first chamber after each of the first step, the second step, and the third step, and a fifth step of performing microwave treatment. Performing each of the first to fourth steps one or more times is regarded as one cycle, and the fifth step is performed in a second chamber after the one cycle is repeated a plurality of times. The first to third precursors are different kinds of precursors, the microwave treatment is performed using an oxygen gas and an argon gas, the metal oxide includes a crystal region, and a c-axis of the crystal region is substantially parallel to a normal vector of a surface where the metal oxide is formed or a normal vector of a surface of the metal oxide.