Ion-Sensitive Structure Doped Metal Oxide Layer Stability
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Solution Overview
Problem
Existing ion-sensitive structures face challenges with chemical and electrical stability, particularly in aggressive media, due to issues with amorphous metal oxide layers and interface problems, leading to sensor drift and sensitivity issues.
Innovation Solution
A doped intermediate metal oxide layer is introduced between the semiconductor structure and the sensor layer, reducing vertical grain boundaries and structural defects, enhancing chemical and thermal stability, and minimizing cross-sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amorphous metal oxide layers are used, then deposition is simpler, but chemical stability and resistance to planar etching deteriorate
Solution Approach 1:
The patent applies phase transition by transforming the metal oxide layer from amorphous to crystalline state through controlled thermal treatment. This phase change enables the material to achieve high chemical stability and resistance to planar etching while maintaining a relatively simple deposition process, thereby resolving the contradiction between ease of manufacture and reliability.
2Reliability
If crystalline metal oxide layers are used, then chemical stability improves, but vertical grain boundaries cause pore etching and undercutting
Solution Approach 1:
The patent changes the crystalline structure parameters by forming a specific crystal phase (such as rutile or anatase for TiO2) through controlled thermal treatment. This parameter change in crystal structure reduces the formation of vertical grain boundaries, thereby minimizing pore etching and undercutting while maintaining chemical stability.
Solution Approach 2:
The patent employs composite material structures by combining metal oxide layers with other materials (such as silicon nitride or silicon oxide) to form a multi-layer system. This composite approach allows the metal oxide to provide chemical stability while the other materials compensate for the harmful effects of vertical grain boundaries.
3Object-affected harmful factors
If multilayered polycrystalline metal oxides are used, then vertical grain boundaries are disrupted, but interface problems cause poor reproducibility and charge trapping
Solution Approach 1:
The patent applies homogeneity by using a single-layer crystalline metal oxide structure instead of multilayered combinations. This homogeneous approach eliminates interface-related charge trapping and reproducibility issues while still disrupting vertical grain boundaries through controlled crystal growth and thermal treatment.
4Ease of manufacture
If metal oxides are tempered to retain amorphous structure, then deposition remains simple, but photosensitivity and chemical instability increase
Solution Approach 1:
The patent applies phase transition by controlling the thermal treatment process to transform the metal oxide from amorphous to crystalline state. This phase change eliminates photosensitivity and chemical instability inherent in amorphous structures while maintaining a relatively simple deposition process followed by controlled annealing.
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
The solution achieves high chemical and electrical resistance, improved stability, and sensitivity in aggressive media, with minimal sensor drift and reproducible measurement results.
Implementation Method 1
a doped intermediate layer (14) having a doping material and a metal oxide material doped with the doping material (33)
Data Source
Figure 1
Figure 2A~2D
Figure 2E~2F
AI summary
An ion-sensitive structure comprises a semiconductor structure and a stack of layers arranged on the semiconductor structure, with a doped interlayer containing a dopant material and a first metal oxide material. The semiconductor structure is designed to modify an electrical property based on contact between the ion-sensitive structure and an electrolyte containing ions.