2026/02/28 by Pouyan Navabi, Christos G. Takoudis · 1 voice
Engineering · Materials Science · #Atomic layer deposition #Bayesian inference #Bayesian probability #Convergence (economics) #Deposition (geology) #Electronic and Structural Properties of Oxides #Estimation theory #Gaussian #Gaussian process #Machine Learning in Materials Science #Saturation (graph theory) #Semiconductor materials and devices #Standard deviation
paper · open access · doi:10.1116/6.0005430
published in Journal of Vacuum Science & Technology A Vacuum Surfaces and Films 44(3) (American Institute of Physics)
openalex publication_date 2026/04/24 · openalex created_date 2026/04/25 · openalex updated_date 2026/08/05
Atomic Layer Deposition process development is often hindered by time-consuming and precursor-intensive tuning cycles required to identify saturation conditions. We introduce a physics-informed Bayesian active learning framework that autonomously tunes precursor pulse times by integrating a Langmuir adsorption model directly into the Gaussian Process (GP) kernel. A key innovation is a two-stage parameter estimation strategy that decouples noise filtering from physical parameter extraction: the GP first smooths noisy data through standard prediction, then Langmuir parameters are fitted to the noise-filtered GP predictions. This approach effectively separates signal from experimental noise. We evaluate the framework against a standard data-driven GP across four simulated regimes, demonstrating convergence within five iterations, up to fourfold improvement in prediction accuracy, and two to fourfold reduction in precursor usage. Experimental validation using TiO2 deposition via Tetrakisdimethylamido Titanium and ozone confirms that the physics-informed model accurately identifies saturation times for high-coverage targets (≥95%), with observed deviations at lower saturation levels providing valuable insight into non-ideal desorption behaviors.