Spin-On SAM Annealing for Area-Selective Deposition Precision
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Solution Overview
Problem
Existing substrate lithography methods face challenges in achieving high selectivity and reducing defects, particularly in area-selective deposition processes, where self-assembled monolayers (SAMs) struggle to selectively deposit materials without extending beyond target boundaries.
Innovation Solution
The proposed solution involves controlling and varying process parameters during the anneal step in the spin-on process for forming SAMs, such as gas composition, flow rate, chamber pressure, temperature, and time, to enhance the selectivity of SAMs and prevent edge exclusion defects in dielectric-on-dielectric (DoD) processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithography is used for patterning, then established process maturity is maintained, but manufacturing precision deteriorates due to resolution limits at shrinking geometries
Solution Approach 1:
The patent replaces conventional optical lithography with a chemical self-assembly process. Instead of using light to pattern materials, the invention uses self-assembled monolayers (SAMs) that spontaneously organize on substrate surfaces through chemical interactions, eliminating the need for complex optical systems and enabling finer feature sizes.
Solution Approach 2:
The patent employs self-aligned processing where the self-assembled monolayers automatically position themselves on the substrate without external intervention. The SAMs self-organize based on their chemical properties, creating patterns that are inherently aligned with the substrate geometry, thereby eliminating alignment errors associated with conventional lithography.
2Adaptability or versatility
If self-assembled monolayers are used to inhibit dielectric growth on metal surfaces, then area-selective deposition is achieved, but manufacturing precision deteriorates due to insufficient SAM selectivity causing edge exclusion defects
Solution Approach 1:
The patent modifies the chemical parameters of the self-assembled monolayer system by introducing specific molecular structures and compositions. The SAMs are designed with particular head groups and tail groups that create enhanced chemical contrast between metal and dielectric surfaces, improving selectivity and eliminating edge exclusion defects while maintaining area-selective deposition capability.
3Manufacturing precision
If spin-on process is used to form SAMs with controlled anneal parameters, then SAM selectivity is improved, but process complexity increases due to multiple controlled parameters
Solution Approach 1:
The patent optimizes the anneal process parameters (temperature, time, atmosphere) to achieve the desired SAM formation. By carefully controlling these parameters, the process achieves high selectivity while maintaining feasibility in standard fabrication environments, balancing precision with practical implementability.
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
By optimizing these process parameters, the SAMs can be made to completely cover non-target surfaces without encroaching on target materials, thereby reducing or eliminating defects such as edge exclusion in DoD processes, ensuring precise and uniform deposition.
Implementation Method 1
a spin coating step for coating a surface of a semiconductor substrate with a liquid solution containing SAM-forming molecules
Implementation Method 2
an anneal step for heat treating the semiconductor substrate to chemically bond the SAM-forming molecules to the non-target material exposed on the substrate surface
Implementation Method 3
heat treating the semiconductor substrate to chemically bond the SAM-forming molecules to the non-target material
Implementation Method 4
a rinse step for washing excess liquid solution away from the substrate surface after bonding occurs
Data Source
AI summary
Various embodiments of methods are provided to control formation of self-assembled monolayers (SAMs) used in an area-selective deposition (ASD) process, and thus, prevent defects in the ASD process. In the disclosed embodiments, a SAM structure is formed via a spin-on process that includes: (a) a spin coating step for coating a surface of a semiconductor substrate with a liquid solution containing SAM-forming molecules, the semiconductor substrate having a target material and a non-target material exposed on the substrate surface, and (b) an anneal step for heat treating the semiconductor substrate to chemically bond the SAM-forming molecules to the non-target material exposed on the substrate surface. By controlling and/or varying process parameter(s) utilized during the anneal step, the embodiments disclosed herein improve the selectivity of the SAM structure to the non-target material and prevent defects from occurring when a film is subsequently deposited onto the target material.