Organosilane Hardmask Composition for Etch Selectivity
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Solution Overview
Problem
Resist materials in lithographic techniques lack sufficient etch resistance and selectivity, leading to damage during substrate processing, especially in miniaturized circuits where thin resist layers struggle to act as effective masks, and the similarity in composition between antireflective coating and resist materials results in poor etch selectivity and consumption of resist layers during etching.
Innovation Solution
A hardmask composition comprising an organosilane polymer and solvent, with specific molecular ratios and additives, is developed to provide high etch selectivity, solvent resistance, and antireflective properties, allowing for effective pattern transfer to silicon oxide films without dissolving in solvents used for antireflective films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hardmask composition using polycondensation product of silane compound is used, then etch resistance is improved, but storage stability deteriorates due to premature polycondensation in solution state
Solution Approach 1:
The patent changes the chemical parameters of the silane compound by selecting specific types (tetraalkoxysilane, trialkoxysilane, or dialkoxysilane) and controlling the polycondensation degree to 1-50% through parameter optimization. This prevents premature polycondensation while maintaining etch resistance. The solution also controls water content (0.1-10 wt%) and uses specific solvents to stabilize the composition during storage.
Solution Approach 2:
The patent creates a composite hardmask composition by combining silane compounds with specific solvents and controlling the polycondensation reaction to form a partial polycondensation product. This composite structure maintains both storage stability and etch resistance, overcoming the limitation of complete polycondensation products that are unstable in solution.
2Illumination intensity
If antireflective coating material is used to minimize reflectivity, then optical performance is improved, but etch selectivity deteriorates due to similarity in composition with resist material layer
Solution Approach 1:
The patent develops a hardmask composition with composite chemistry combining silane-based etch resistance with controlled polycondensation products. This composite structure provides both antireflective properties and superior etch selectivity against organic resist materials, eliminating the need for separate ARC layers while maintaining pattern fidelity.
Solution Approach 2:
The patent changes the chemical composition parameters by using silane compounds with specific alkoxyl groups and controlling the polycondensation degree. This creates a material with distinct chemical properties from organic resist, enabling high etch selectivity while maintaining optical performance for antireflective applications.
3Strength
If polycondensation product of silane compound with high molecular weight is used, then etch resistance is improved, but solubility deteriorates causing defects in coating
Solution Approach 1:
The patent optimizes the polycondensation degree parameter to 1-50%, preventing excessive molecular weight increase that would cause insolubility. It also controls water content (0.1-10 wt%) and uses specific solvents to maintain solubility while achieving sufficient etch resistance through controlled polycondensation.
Solution Approach 2:
The patent creates a composite system combining silane compounds with specific solvents and controlled polycondensation products. This composite approach maintains solubility for defect-free coating while providing adequate etch resistance, avoiding the problems of highly crosslinked insoluble networks.
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 hardmask composition achieves improved etch resistance, selectivity, and solvent resistance, ensuring accurate pattern transfer and maintaining film stability during processing, thereby overcoming the limitations of existing resist materials in lithographic techniques.
Implementation Method 1
the hardmask composition achieves improved etch resistance, selectivity, and solvent resistance
Implementation Method 2
maintaining film stability during processing, thereby overcoming the limitations of existing resist materials
Data Source
AI summary
A hardmask composition for processing a resist underlayer film includes a solvent and an organosilane polymer, wherein the organosilane polymer is represented by Formula 6:In Formula 6, R is methyl or ethyl, R′ is substituted or unsubstituted cyclic or acyclic alkyl, Ar is an aromatic ring-containing functional group, x, y and z satisfy the relations x+y=4, 0.4≦x≦4, 0≦y≦3.6, and 4×10−4≦z≦1, and n is from about 3 to about 500.