Plasma Cyclical Deposition Patterning Without Photoresist
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Solution Overview
Problem
Traditional photoresist processes for forming patterned features on a substrate require numerous steps, expensive equipment, and can lead to misalignment and material waste, necessitating improved methods for efficient and cost-effective pattern formation.
Innovation Solution
A plasma-enhanced cyclical deposition process is used to form a transformable layer on a substrate, where a first material is exposed to energy to create a second material with different etch rates, allowing selective etching to form patterned features with fewer steps and less equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional photoresist processes are used to form patterned features, then pattern formation can be achieved, but the process requires a relatively large number of steps including coating, developing, and stripping photoresist
Solution Approach 1:
The patent extracts and eliminates the photoresist material and its associated processing steps (coating, developing, stripping) from the traditional pattern formation process. Instead of using photoresist as a temporary masking layer that must be removed, the invention uses the substrate's own material layers as both the pattern definition and the final device structure, thereby removing the unnecessary photoresist workflow
Solution Approach 2:
The patent merges the pattern formation function with the device structure material layers. The same material layers that form the device structure also serve as the pattern definition through selective etching, combining what were previously separate functions (photoresist patterning and device layer formation) into a unified process
2Productivity
If traditional photoresist techniques are used, then patterned features can be formed, but relatively expensive equipment such as coaters, developers and photoresist strippers is required
Solution Approach 1:
The patent removes the need for specialized photoresist equipment (coaters, developers, strippers) by eliminating photoresist from the process entirely. The pattern formation is achieved using only the existing semiconductor fabrication equipment capable of depositing and etching the device structure materials
Solution Approach 2:
The patent makes the device structure materials serve multiple functions: they form both the final device structure and the pattern definition through differential etching. This eliminates the need for dedicated photoresist processing equipment by using the same materials and equipment for both patterning and device fabrication
3Manufacturing precision
If photoresist is used for patterning, then material removal can be guided, but additional materials are required to form the device and photoresist must be removed after use
Solution Approach 1:
The patent enables the device structure materials to define their own patterns through selective etching based on their inherent etch rate differences. The materials self-organize into the desired pattern without requiring external photoresist guidance, and nothing needs to be removed after patterning since the patterned materials are the final device structure
Solution Approach 2:
The patent eliminates the need to discard photoresist material after use. The pattern-defining materials are retained as the final device structure, converting what would be temporary sacrificial material into permanent functional material, thereby recovering 100% of the pattern-defining material
4Manufacturing precision
If traditional photoresist processes are used, then patterned features can be formed, but relatively high opportunities for misalignment occur
Solution Approach 1:
The patent merges the pattern definition and device structure into the same material layers, eliminating the alignment interface between photoresist and device layers. Since the pattern is defined by the device layers themselves through selective etching, alignment errors between separate materials are eliminated
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 reduces processing steps and equipment requirements while minimizing misalignment, enabling efficient formation of patterned features that can be integrated into device structures.
Implementation Method 1
using a plasma-enhanced cyclical deposition process, forming a transformable layer comprising a first material on the surface of the substrate
Implementation Method 2
exposing the transformable layer to energy to form a second material in a first region of the transformable layer exposed to the energy
Data Source
AI summary
Methods of forming patterned features on a surface of a substrate are disclosed. Exemplary methods include using a plasma-enhanced cyclical deposition process to form a transformable layer including a first material and exposing the transformable layer to energy to form a second material. The first or second material can be selectively etched relative to the other of the first and second material.