Gas Sensor Transition Metal Chalcogenide Layer Uniformity
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Solution Overview
Problem
Conventional methods face challenges in manufacturing transition metal chalcogenide layers with uniform thickness and large area, limiting the production of devices with high gas adsorption efficiency and sensitivity.
Innovation Solution
A gas sensor is manufactured using a transition metal chalcogenide layer on a substrate, with a metal nano material like Ag, Pt, or Au added to control the band gap, and formed through atomic layer deposition and thermal treatments to achieve uniformity and large area coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to form transition metal chalcogenide layers, then the manufacturing process is simple, but the layer cannot achieve uniform thickness and large area
Solution Approach 1:
The manufacturing process is divided into multiple sequential steps: forming transition metal oxide layer, selective removal, chalcogenization treatment, and metal nano material deposition. This segmentation allows precise control over layer formation and enables achieving uniform thickness and large area coverage that cannot be obtained by conventional single-step methods
Solution Approach 2:
The transition metal oxide layer is formed in advance before the chalcogenization step. This preliminary formation allows precise control of the layer's thickness and area before the final chalcogenide conversion, enabling subsequent optimization of the layer properties through controlled chalcogenization treatment
2Area of stationary object
If conventional methods are used, then the manufacturing process is simple, but the layer cannot achieve large area coverage
Solution Approach 1:
The process segments the layer formation into oxide layer deposition, selective removal, and chalcogenization steps. This segmentation enables large area coverage by allowing the oxide layer to be formed over large areas first, then selectively converted to chalcogenide in controlled regions, achieving both large area and uniform thickness
Solution Approach 2:
The method utilizes parameter changes in the chalcogenization treatment process, including temperature control (300-500°C for 30-60 minutes) and atmosphere control (hydrogen or hydrogen sulfide), to transform the oxide layer to chalcogenide layer while maintaining large area coverage and uniform thickness
3Reliability
If metal nano material is added to control band gap, then gas adsorption efficiency and sensitivity are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The metal nano material is deposited after the chalcogenide layer formation is completed. This preliminary action sequence ensures that the base chalcogenide layer with desired thickness and area is first established, then the metal nano material is added to control band gap and enhance gas adsorption, achieving improved performance without compromising the structural quality
Solution Approach 2:
The patent creates a composite structure by combining transition metal chalcogenide layer with metal nano material (such as tungsten disulfide with silver nano wires). This composite approach leverages the semiconductor properties of TMDC and the catalytic/band gap control properties of metal nano materials to achieve high gas adsorption efficiency and sensitivity
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 method enables the production of gas sensors with high thickness uniformity, excellent gas adsorption efficiency, and high sensitivity, specifically improving stability and responsiveness to target gases.
Implementation Method 1
forming a transition metal oxide layer on the substrate using an atomic layer deposition process
Implementation Method 2
chalcogenizing the transition metal oxide layer
Implementation Method 3
performing a second thermal treatment at a second temperature higher than the first temperature, while supplying the hydrogen sulfide on the substrate
Implementation Method 4
forming a tungsten disulfide layer, by heat-treating the tungsten oxide layer while supplying sulfide on the tungsten oxide layer
Implementation Method 5
the metal nano material may be provided to dope the transition metal chalcogenide layer, thereby reducing the band gap of the transition metal chalcogenide layer
Implementation Method 6
applying liquid containing a metal nano material on the transition metal chalcogenide layer, and heating the substrate in an inert gas atmosphere to evaporate the liquid
Data Source
AI summary
Provided are a gas sensor and a method of manufacturing the same. The gas sensor may include a transition metal chalcogenide layer on a substrate, a metal nano material on the transition metal chalcogenide layer, and an electrode on the transition metal chalcogenide layer with the metal nano material.