Spin-Coating System for Self-Assembled Monolayer Film Formation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current nanofabrication techniques for semiconductor devices require costly chemicals and extensive time to form low dielectric constant films, necessitating a more efficient method for spin-coating molecular self-assembly (MSA) chemicals.
Innovation Solution
A spin-coating processing system that includes a spin-coating chamber for dispensing MSA chemicals onto a substrate, followed by an annealing chamber for thermal treatment, utilizing a pre-treatment process involving a hydroxide layer and solvents to enhance film formation, and a method to control the rotation speed and solvent composition to prevent agglomeration, enabling the formation of self-assembled monolayers (SAMs) and organosilicates with reduced chemical usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If chemical vapor deposition (CVD) techniques are used to form low dielectric constant films, then the films can be formed with desired properties, but the cost of chemicals and processing time increase significantly
Solution Approach 1:
The patent changes the fundamental parameter of film formation from vapor-phase deposition to liquid-phase spin-coating. This involves changing the physical state of the precursor material from gas to liquid, and changing the deposition mechanism from chemical vapor deposition to molecular self-assembly followed by sol-gel processing. This parameter change dramatically reduces chemical consumption while maintaining film quality
Solution Approach 2:
The patent replaces the thermal field-dominated CVD process with a mechanical field-based spin-coating process. The spin-coating mechanism uses centrifugal force to distribute the liquid precursor uniformly across the substrate, replacing the need for extensive chemical vapor deposition processes and reducing both chemical usage and processing time
2Reliability
If substrates are submerged into chemical baths to generate self-assembled monolayers, then the MSA material formation can be achieved, but the process is time-consuming and uses excessive chemicals
Solution Approach 1:
The patent applies preliminary action by first forming a self-assembled monolayer on the substrate before applying the organosilicate precursor. This pre-treatment step creates a controlled surface that enhances the subsequent spin-coating process, allowing for faster and more reliable film formation compared to direct chemical bath treatment
Solution Approach 2:
The patent segments the film formation process into distinct steps: (1) self-assembled monolayer formation, (2) spin-coating of organosilicate precursor, and (3) thermal processing. This segmentation allows each step to be optimized independently and reduces the total processing time compared to a single prolonged chemical bath treatment
3Quantity of substance
If spin-coating is used to dispense MSA chemicals, then chemical consumption is reduced, but film uniformity and adhesion may be compromised
Solution Approach 1:
The patent uses the self-assembled monolayer as an intermediary between the substrate and the organosilicate film. This intermediary layer improves adhesion and ensures uniform film formation during spin-coating, allowing for reduced chemical usage while maintaining film quality. The SAM acts as a coupling layer that enhances the effectiveness of the spin-coating process
Solution Approach 2:
The patent optimizes multiple parameters of the spin-coating process including rotation speed, precursor viscosity, and solvent composition to achieve uniform film deposition with minimal chemical usage. By carefully controlling these parameters, the process achieves both low chemical consumption and high film uniformity
4Strength
If pre-treatment processes are applied to substrates before spin-coating, then film adhesion is improved, but the process complexity increases
Solution Approach 1:
The patent applies a preliminary self-assembled monolayer formation step that, while adding a process step, uses a simple and reliable mechanism. This pre-treatment creates a controlled surface chemistry that significantly improves subsequent film adhesion, and the simplicity of the SAM formation process offsets the added complexity
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 system effectively reduces chemical consumption and improves film uniformity and adhesion, achieving low dielectric constant films with enhanced properties such as uniform thickness and water contact angle, while preventing defects and agglomeration.
Implementation Method 1
The spin-coating processing system may include a spin-coating chamber that can receive and spin-coat MSA chemicals onto the substrate
Implementation Method 2
an annealing chamber to thermally treat the substrate after the spin-coat process
Implementation Method 3
Molecular self-assembly (MSA) techniques may be used to overcome geometry (e.g., photolithography) limitations by generating alternative resist materials
Implementation Method 4
generating a hydroxide layer on a surface of the substrate to attract and bond with a portion of the SAM, such that the SAMs are oriented or bonded to the substrate in a particular manner
Implementation Method 5
The system may also dispense a first solvent (e.g., PGMEA) to pre-wet the substrate to enable the MSA chemicals to flow more easily over the surface of the substrate
Data Source
AI summary
This disclosure relates to a processing system for spin-coating a substrate with Molecular Self-assembly (MSA) chemicals to form photoresist films and/or low dielectric constant (low-k) films on the substrate. The spin-coating processing system may include a spin-coating chamber that can receive and spin-coat MSA chemicals onto the substrate and an annealing chamber to thermally treat the substrate after the spin-coat process. In certain embodiments, the spin-coating processing system may also pre-treat or pre-wet the substrate prior to the spin-coating process.