Metal Oxide Blocking Layer Crystallinity and Surface Roughness Trade-off
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Solution Overview
Problem
Conventional materials for manufacturing semiconductor devices fail to meet the increasing demands of higher operating speed and integration, leading to suboptimal performance due to process conditions and material characteristics.
Innovation Solution
A method of forming a blocking insulating layer in semiconductor devices by creating a lower metal oxide layer in a crystalline phase and an upper metal oxide layer using the lower layer as a seed, with the upper layer being crystallized through heat treatment, to enhance the semiconductor device's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional materials are used for manufacturing semiconductor devices, then manufacturing process is simple, but operating speed and integration capacity are insufficient
Solution Approach 1:
The patent changes the physical and chemical parameters of the blocking insulating layer by forming metal oxide layers at different temperatures (first temperature for lower layer, second temperature for upper layer) and controlling their crystalline phases, thereby improving charge retention characteristics and enabling higher integration capacity while maintaining manufacturing feasibility
Solution Approach 2:
The patent uses composite material structure with multiple metal oxide layers (lower metal oxide layer and upper metal oxide layer) having different crystalline phases and properties, where each layer contributes different characteristics to achieve overall improved performance for high-capacity semiconductor devices
2Stability of the object's composition
If metal oxide layers are formed at high temperature to achieve crystalline phase, then crystallinity is improved, but surface roughness increases
Solution Approach 1:
The patent divides the blocking insulating layer into multiple segments (lower metal oxide layer and upper metal oxide layer) formed at different temperatures, where the lower layer is formed at higher temperature to provide crystalline structure and the upper layer is formed at lower temperature to maintain smooth surface, thereby resolving the contradiction between crystallinity and surface roughness
Solution Approach 2:
Different regions of the blocking insulating layer are given different local qualities: the lower layer has high-temperature formed crystalline structure for stability, while the upper layer has low-temperature formed structure for surface smoothness, allowing each region to optimize its properties for its specific function
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 improves the crystallinity and reduces surface roughness of the metal oxide layers, resulting in better charge retention and higher integration capabilities, addressing the limitations of conventional materials and processes.
Implementation Method 1
the lower metal oxide layer may be formed in-situ in a crystalline phase
Implementation Method 2
The blocking insulating layer may be formed by heat-treating the upper metal oxide layer so that the upper metal oxide layer is crystallized
Implementation Method 3
heat treating the upper metal oxide layer may include crystallizing the upper metal oxide layer using the lower metal oxide layer as a seed
Data Source
AI summary
Methods of manufacturing a semiconductor device are provided including forming a charge storage layer on a gate insulating layer that is on a semiconductor substrate. A blocking insulating layer is formed on the charge storage layer and an electrode layer is formed on the blocking insulating layer. The blocking insulating layer may be formed by forming a lower metal oxide layer at a first temperature and forming an upper metal oxide layer on the lower metal oxide layer at a second temperature, lower than the first temperature.