Trilayer Resist Patterning With Polymer-Bound PAG for Tight Process Windows
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Solution Overview
Problem
As semiconductor devices shrink in size, the process windows for photolithographic processing become increasingly tight, necessitating advances in photolithographic technology to maintain the ability to scale down devices effectively.
Innovation Solution
The implementation of a trilayer resist system that includes a polymer bound photoacid generator (PAG) in the middle layer, which generates acid upon exposure to actinic radiation, reducing scum defects and allowing for lower exposure doses, thereby improving pattern resolution and device yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If photolithographic processing is used for patterning, then devices can be manufactured, but process windows become tighter as device size decreases
Solution Approach 1:
The patent divides the photolithographic process into multiple sequential stages using a trilayer resist system: a bottom layer for initial patterning, a middle layer for pattern transfer, and a top layer for final definition. This segmentation allows each layer to be optimized independently, maintaining manufacturing precision even as device dimensions shrink
Solution Approach 2:
The patent employs polymer-bound photoacid generators (PAGs) that undergo parameter changes upon exposure to actinic radiation, generating acid in a controlled manner. This enables lower exposure doses to achieve the same patterning效果, effectively widening the process window despite reduced device size
2Manufacturing precision
If exposure dose is reduced to improve pattern resolution, then line width and edge roughness decrease, but scum defects increase
Solution Approach 1:
The patent introduces a middle layer containing polymer-bound PAGs that act as an intermediary between the actinic radiation and the top pattern-defining layer. This intermediary generates acid in a controlled fashion, enabling low-dose exposure without producing scum defects, thus resolving the contradiction between pattern resolution and defect formation
Solution Approach 2:
The patent applies different functional characteristics to different layers: the bottom layer provides robust initial patterning, the middle layer with polymer-bound PAGs provides controlled acid generation, and the top layer provides precise pattern definition. This local differentiation allows low exposure doses to achieve high resolution without scum defects
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 approach enhances pattern resolution, decreases line width and edge roughness, and increases semiconductor device yield by enabling the use of lower exposure doses, thus supporting the continued miniaturization of semiconductor devices.
Implementation Method 1
a polymer bound photoacid generator (PAG) in the middle layer, which generates acid upon exposure to actinic radiation
Data Source
AI summary
A method of manufacturing a semiconductor device includes forming a first layer including an organic material over a substrate. A second layer including a reaction product of a silicon-containing material and a photoacid generator is formed over the first layer. A photosensitive layer is formed over the second layer, and the second layer is patterned.