MIM Capacitor Patterning Using a Growth-Inhibiting Sacrificial Layer
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Solution Overview
Problem
The complexity and cost of manufacturing micro- and nano-electronic devices, such as MIM capacitors, are increased by the need for multiple steps in photolithographic and etching methods, leading to misalignment and inefficiency due to the complexity of patterning material layers at submicronic and nanometric sizes.
Innovation Solution
A method involving a sacrificial layer made of lithiated materials, such as lithium oxide or lithium oxynitride, is used to selectively grow a functional layer on a substrate, where the sacrificial layer inhibits the growth of the functional layer, allowing for patterned deposition through selective elimination, reducing the number of manufacturing steps and minimizing misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithographic and etching methods are used to pattern material layers, then patterning capability is achieved, but the number of manufacturing steps increases and manufacturing complexity increases
Solution Approach 1:
A sacrificial layer is introduced as an intermediary element that temporarily occupies space and prevents functional layer deposition in specific areas. This mediator enables precise patterning by controlling where the functional layer can and cannot grow, thereby achieving the desired pattern without requiring multiple photolithographic and etching steps.
Solution Approach 2:
The sacrificial layer is deposited in advance before the functional layer. This preliminary action establishes the pattern geometry beforehand, allowing the functional layer to be deposited selectively only in regions where the sacrificial layer is absent, thus simplifying the overall manufacturing process.
2Manufacturing precision
If multiple photolithographic and etching steps are implemented, then patterning precision is improved, but manufacturing cost increases
Solution Approach 1:
The sacrificial layer serves as a cost-effective intermediary that enables high-precision patterning through a single deposition step rather than multiple expensive photolithographic and etching cycles. This approach maintains patterning precision while significantly reducing manufacturing costs.
3Manufacturing precision
If the number of manufacturing steps is increased, then patterning capability is enhanced, but the risk of misalignment increases
Solution Approach 1:
The sacrificial layer is deposited in advance to define the exact pattern geometry before the functional layer is introduced. This preliminary patterning action ensures that the functional layer will be deposited only in the correct locations, eliminating alignment issues that would arise from multiple subsequent processing steps.
Solution Approach 2:
The sacrificial layer acts as a spatial mediator that physically blocks the functional layer from depositing in unwanted areas. This intermediary mechanism guarantees precise spatial control and eliminates misalignment risks associated with multiple photolithographic and etching steps.
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 method reduces the number of manufacturing steps and costs associated with micro- and nano-electronic devices by enabling precise patterning of functional layers with fewer steps, improving efficiency and reducing the risk of misalignment in MIM capacitors.
Implementation Method 1
When the precursors of the functional layer are deposited on the sacrificial layer, an interaction between the compounds present in the sacrificial layer and these precursors takes place, therefore resulting in a delay or even absence of growth of the first atomic layers of the functional layer
Data Source
AI summary
The invention relates, firstly, to a method for patterning a functional layer (130), comprising at least the following steps of:providing a substrate (110) having a surface locally covered by a so-called sacrificial layer (120), one or more areas of the surface of the substrate (110) being devoid of the sacrificial layer (120);selectively growing the functional layer (130) on the area(s) of the surface of the substrate (110) devoid of the sacrificial layer (120);eliminating the sacrificial layer (120);whereby the surface of the substrate (110) is covered by a patterned functional layer (130).Subsequently, the invention relates to a method for preparing a MIM capacitor, implementing the patterning method for patterning at least one layer of the capacitor.Applications: micro- and nano-electronic devices such as electronic chips, manufacturing of high-density MIM capacitors.