Upper Electrode Barrier Structure Against Hydrogen Diffusion
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Solution Overview
Problem
As semiconductor devices increase in integration density, their electrical characteristics deteriorate due to hydrogen diffusion affecting the metal and dielectric layers, leading to performance issues.
Innovation Solution
Incorporating a hydrogen diffusion barrier layer in the upper electrode structure, composed of materials like titanium nitride, to prevent hydrogen atoms from diffusing into the metal and dielectric layers, while reducing the overall thickness of the semiconductor layer to enhance integration density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If integration density of semiconductor devices is increased, then productivity and device capacity are improved, but electrical characteristics deteriorate due to hydrogen diffusion
Solution Approach 1:
A hydrogen diffusion barrier layer is introduced as an intermediary component between the upper electrode and the metal/dielectric layers. This barrier layer specifically blocks hydrogen diffusion while maintaining electrical functionality, thus resolving the contradiction between high integration density and reliable electrical characteristics
Solution Approach 2:
The upper electrode is constructed using composite material structure comprising a metal layer, a hydrogen diffusion barrier layer, and a semiconductor layer. This composite structure combines the benefits of high conductivity (metal layer) with hydrogen diffusion prevention (barrier layer), enabling both high integration density and maintained electrical characteristics
2Productivity
If thickness of semiconductor layer is reduced to enhance integration density, then productivity is improved, but device reliability may worsen due to increased susceptibility to hydrogen diffusion
Solution Approach 1:
The hydrogen diffusion barrier layer serves as a protective intermediary that enables thinning of the semiconductor layer without compromising reliability. By placing this barrier layer adjacent to the metal layer, hydrogen diffusion is blocked even when the semiconductor layer is thin, thus maintaining device reliability while achieving higher integration density
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
Prevents hydrogen-induced deterioration of electrical characteristics, allowing for higher integration density and improved performance of semiconductor devices.
Implementation Method 1
Incorporating a hydrogen diffusion barrier layer in the upper electrode structure, composed of materials like titanium nitride, to prevent hydrogen atoms from diffusing into the metal and dielectric layers
Data Source
AI summary
A semiconductor device may include a substrate, bottom electrodes disposed on the substrate, a supporting pattern disposed between the bottom electrodes, when viewed in a plan view, an upper electrode covering the bottom electrodes and the supporting pattern, a dielectric layer disposed between the bottom electrodes and the upper electrode and between the supporting pattern and the upper electrode and a first conductive contact connected to the upper electrode. The upper electrode comprises a metal layer, a first hydrogen diffusion barrier layer, and a first semiconductor layer, which are sequentially stacked on the dielectric layer. The first conductive contact is spaced apart from the first hydrogen diffusion barrier layer.