Bottom Electrode Doping Structure for High-Capacitance DRAM Cells
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Solution Overview
Problem
Current semiconductor device fabrication techniques face challenges in achieving high integration and increased capacitance due to difficulties in forming fine patterns and high electrical resistance, which can lead to reduced process yield and reliability.
Innovation Solution
The semiconductor device design includes a bottom electrode with a main region and two doping regions, where the first doping region contains oxygen and a doping metal, and the second doping region contains nitrogen, with a specific concentration gradient, and a dielectric layer between the electrodes, allowing for reduced electrical resistance and increased capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If line widths of patterns are reduced for high integration, then integration density is improved, but manufacturing precision deteriorates due to difficulties in forming fine patterns
Solution Approach 1:
The patent changes the chemical composition parameters of the bottom electrode by introducing doping regions with specific oxygen and nitrogen concentrations. This allows the formation of finer patterns with better control over electrode properties, enabling high integration without sacrificing manufacturing precision.
Solution Approach 2:
The patent applies local quality by creating doping regions with different oxygen and nitrogen concentrations at specific locations within the bottom electrode. The first doping region has higher oxygen concentration near the dielectric layer, while the second doping region has nitrogen addition, creating localized property variations that improve pattern formation precision in high integration structures.
2Reliability
If conventional bottom electrode structure is used, then device simplicity is maintained, but electrical resistance increases reducing reliability
Solution Approach 1:
The bottom electrode structure applies local quality by creating doping regions with specific oxygen and nitrogen concentrations at particular locations. The first doping region has higher oxygen concentration adjacent to the dielectric layer, and the second doping region includes nitrogen, creating localized property variations that reduce electrical resistance and improve reliability without excessive complexity.
Solution Approach 2:
The patent uses composite materials by combining the bottom electrode base material with doped regions containing oxygen and nitrogen. This creates a composite structure where the doping regions provide enhanced electrical conductivity properties, reducing overall electrical resistance while maintaining structural integrity.
3Quantity of substance
If capacitance is increased for higher integration, then storage capacity is improved, but manufacturing complexity increases reducing process yield
Solution Approach 1:
The patent changes material composition parameters by introducing doping regions with controlled oxygen and nitrogen concentrations in the bottom electrode. This enables increased capacitance through improved electrode properties while using existing semiconductor fabrication processes, avoiding excessive manufacturing complexity and maintaining process yield.
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 design enhances capacitance and reduces defects, such as storage node bridge defects, thereby improving the reliability and yield of the semiconductor device fabrication process.
Implementation Method 1
Each of the first and second doping regions may include oxygen and a doping metal. In some embodiments, the second doping region may include nitrogen.
Data Source
AI summary
Disclosed are semiconductor devices and fabrication methods for the same. The semiconductor devices may include a bottom electrode, a dielectric layer, and a top electrode that are sequentially stacked on a semiconductor substrate. The bottom electrode includes a first doping region in contact with the dielectric layer, a main region spaced apart from the dielectric layer by the first doping region intervening therebetween, and a second doping region between the first doping region and the main region. Each of the first and second doping regions includes oxygen and a doping metal. In some embodiments, the second doping region may include nitrogen. The main region may be devoid of the doping metal. An amount of oxygen in the second doping region is less than an amount of oxygen in the first doping region.