Polymer Hard Mask for Semiconductor Gap-Fill
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Solution Overview
Problem
The challenge in semiconductor device manufacturing lies in achieving excellent gap-fill and planarization characteristics for hard mask compositions, which are crucial for forming fine patterns in high-integration and high-speed semiconductor devices, as existing technologies face difficulties in maintaining process margins and achieving effective etch selectivity.
Innovation Solution
A polymer-based hard mask composition is developed, featuring a specific chemical structure with heteroatoms, aromatic rings, and a benzene group or polycyclic aromatic group, combined with an organic solvent, which is applied using spin-on-coating and baking processes to form a hard mask layer that fills openings and provides improved mechanical and thermal properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hard mask compositions are used, then the manufacturing process is simple, but the gap-fill and planarization characteristics are poor
Solution Approach 1:
The patent employs composite polymer structures combining aromatic rings, heteroatoms, and specific functional groups to achieve superior gap-fill and planarization characteristics. The composite nature of the polymer, incorporating multiple structural elements (aromatic rings for stability, heteroatoms for etch selectivity, and controlled molecular weight for flow properties), directly resolves the contradiction by delivering enhanced manufacturing precision through material composition rather than process complexity.
Solution Approach 2:
The patent systematically adjusts critical polymer parameters including molecular weight (1,000-10,000), aromatic ring content, heteroatom types and positions, and side chain configurations to optimize gap-fill and planarization performance. By controlling these parameters within specific ranges, the invention achieves excellent manufacturing precision while maintaining manageable structural complexity through defined compositional boundaries.
2Reliability
If existing hard mask materials are used, then the material selection is simple, but the etch selectivity and process margin are insufficient
Solution Approach 1:
The patent introduces local quality variations within the polymer structure by strategically placing heteroatoms (nitrogen, oxygen, sulfur) at specific positions and incorporating different aromatic ring types (benzene, naphthalene, anthracene, pyrene) with distinct electronic and steric properties. This localized structural differentiation enhances etch selectivity by creating regions with varying chemical reactivity and binding affinities, thereby improving reliability without requiring overall compositional complexity.
Solution Approach 2:
The invention optimizes etch selectivity and process margin by precisely controlling polymer parameters such as heteroatom concentration, aromatic ring substitution patterns, molecular weight distribution, and functional group density. These parameter adjustments within defined ranges enable tailored etch resistance and chemical stability, achieving superior reliability while avoiding excessive compositional complexity through systematic parameter optimization.
3Productivity
If high-integration semiconductor devices are manufactured, then device functionality increases, but process margin reduction occurs
Solution Approach 1:
The patent addresses the process margin challenge in high-integration device manufacturing by optimizing polymer parameters including molecular weight (1,000-10,000 for appropriate viscosity and flow), aromatic ring content (for thermal stability during processing), heteroatom distribution (for etch selectivity), and side chain length (for solubility and film formation). These controlled parameter variations enable precise gap-fill and planarization even at reduced feature sizes, maintaining manufacturing precision despite increased device integration and reduced process margins.
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 polymer-based hard mask composition exhibits excellent gap-fill and planarization characteristics, enhancing the etch selectivity and process margin, thereby facilitating the formation of precise patterns in semiconductor devices with improved mechanical and thermal stability.
Implementation Method 1
applied using spin-on-coating and baking processes to form a hard mask layer
Implementation Method 2
applied using spin-on-coating and baking processes to form a hard mask layer
Data Source
AI summary
The present inventive concepts relate to a polymer for a hard mask, a hard mask composition including a polymer for a hard mask as described herein, and a method for forming a pattern of a semiconductor device using a hard mask composition as described herein. The polymer includes a structure represented by the following chemical formula 1.In chemical formula 1, “A”, “Q”, “L”, “R1”, “R2”, “R3”, and “n” are the same as defined in the specification.