FCVD Film Defect Reduction via Parameter Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional plasma-enhanced chemical vapor deposition (PECVD) methods fail to fill narrow trenches with high aspect ratios effectively, leading to void formation and surface roughness due to inability to penetrate deeply, resulting in non-uniform film deposition and increased miniature defects in flowable chemical vapor deposition (FCVD) films.
Innovation Solution
The method involves forming a nucleation layer and FCVD film on a substrate by controlling precursor/reactant pressure ratio, flow ratio, and substrate temperature to minimize miniature defects, and curing the film using techniques such as thermal annealing or UV curing to achieve a smooth, seam-free gap fill in high aspect ratio structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional PECVD is used to deposit dielectric films, then the deposition process can be performed, but the plasma cannot penetrate into deep trenches resulting in void formation and mushroom-shaped films
Solution Approach 1:
The patent changes the deposition parameters by using flowable CVD instead of PECVD, performing deposition at atmospheric pressure with controlled precursor and reactant flow rates. This parameter change enables complete trench filling without void formation while maintaining film uniformity, directly resolving the contradiction between film quality and void prevention
2Manufacturing precision
If FCVD is used to fill narrow trenches with high aspect ratios, then gap filling can be achieved, but miniature defects and surface roughness increase
Solution Approach 1:
The patent applies a preliminary plasma treatment step before FCVD deposition to condition the substrate surface. This preliminary action modifies the surface properties to promote uniform nucleation and reduce miniature defects during subsequent FCVD filling, thereby improving gap fill quality while minimizing defect formation
Solution Approach 2:
The patent optimizes FCVD parameters including precursor flow rate, reactant flow rate, deposition temperature, and chamber pressure to minimize miniature defects. By carefully controlling these parameters, the process achieves smooth film deposition with reduced surface roughness and fewer defects while maintaining effective trench filling
3Duration of action of stationary object
If post curing methods are applied to as deposited FCVD films, then film completion is achieved, but films with varying composition throughout the trench result
Solution Approach 1:
The patent employs continuous deposition followed by continuous curing without interruption or intermediate steps. This continuous process ensures uniform composition throughout the trench by maintaining consistent reaction conditions during both deposition and curing phases, eliminating composition variations that would otherwise occur with separate post-curing steps
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 significantly reduces the number of miniature defects and surface roughness, enabling the deposition of high-quality, smooth FCVD films that fill high aspect ratio trenches without voids, improving the uniformity and quality of the films used in microelectronics device fabrication.
Implementation Method 1
forming a nucleation layer and a flowable chemical vapor deposition (FCVD) film on a substrate surface by exposing the substrate surface to a silicon-containing precursor and a reactant
Implementation Method 2
curing the film using techniques such as thermal annealing or UV curing
Data Source
AI summary
Processing methods disclosed herein comprise forming a nucleation layer and a flowable chemical vapor deposition (FCVD) film on a substrate surface by exposing the substrate surface to a silicon-containing precursor and a reactant. By controlling at least one of a precursor/reactant pressure ratio, a precursor/reactant flow ratio and substrate temperature formation of miniature defects is minimized. Controlling at least one of the process parameters may reduce the number of miniature defects. The FCVD film can be cured by any suitable curing process to form a smooth FCVD film.