skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Elucidating the Evolving Atomic Structure in Atomic Layer Deposition Reactions with in Situ XANES and Machine Learning

Journal Article · · Chemistry of Materials

Precision synthesis of thin films requires an improved mechanistic understanding of the structural evolution of materials at the atomic scale. Atomic layer deposition (ALD) is a critical nanofabrication technique that enables fine-tuning of atomic structure and thickness as a result of its layer-by-layer growth behavior. In this study, in situ X-ray absorption spectra of the S K-edge during ALD growth of ZnS thin films on TiO2 nanoparticles were collected and analyzed. The experimental results show that both sulfide and sulfate species form during the nucleation phase of ZnS on TiO2. As film growth proceeds, the S K-edge of the in situ ZnS film converges to that of a representative ex situ ALD ZnS film. By building representative atomistic models, a high-throughput screening method was developed to determine the most probable atomic configurations as the film structure evolves. Specifically, the screening method consisted of a supervised machine learning analysis of thousands of simulated X-ray absorption near edge structure (XANES) spectra. Atomic-level insight was gained into changes in the coordination environment of surface species as they transitioned from the nucleation phase toward the crystalline ZnS phase. The experimental and computational strategies presented herein provide an example of how in situ synchrotron-based characterization can be leveraged using robust modeling approaches to elucidate the ordering of atoms during thin-film growth.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF); Research Council of Norway; Austrian Research Fund (FWF)
Grant/Contract Number:
AC02-76SF00515; 274459; NJ3505-N20; 1727918
OSTI ID:
1598269
Journal Information:
Chemistry of Materials, Vol. 31, Issue 21; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

References (42)

Economic viability of thin-film tandem solar modules in the United States journal April 2018
Techno-economic viability of silicon-based tandem photovoltaic modules in the United States journal July 2018
The development of flexible integrated circuits based on thin-film transistors journal January 2018
Building logical qubits in a superconducting quantum computing system journal January 2017
Atomic Layer Deposition: An Overview journal January 2010
Modeling Mechanism and Growth Reactions for New Nanofabrication Processes by Atomic Layer Deposition journal December 2015
In Situ Studies on Reaction Mechanisms in Atomic Layer Deposition journal January 2013
Quantifying Geometric Strain at the PbS QD-TiO 2 Anode Interface and Its Effect on Electronic Structures journal November 2015
Exploring the local electronic structure and geometric arrangement of ALD Zn(O,S) buffer layers using X-ray absorption spectroscopy journal January 2015
ALD Zn(O,S) Thin Films’ Interfacial Chemical and Structural Configuration Probed by XAS journal May 2016
Sulfur: not a “silent” element any more journal January 2006
Theoretical approaches to x-ray absorption fine structure journal July 2000
Ab initio theory and calculations of X-ray spectra journal July 2009
Parameter-free calculations of X-ray spectra with FEFF9 journal January 2010
High-throughput computational X-ray absorption spectroscopy journal July 2018
In situ synchrotron based x-ray techniques as monitoring tools for atomic layer deposition
  • Devloo-Casier, Kilian; Ludwig, Karl F.; Detavernier, Christophe
  • Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 32, Issue 1 https://doi.org/10.1116/1.4851716
journal January 2014
In situ synchrotron x-ray characterization of ZnO atomic layer deposition journal November 2010
Evolution of Crystal Structure During the Initial Stages of ZnO Atomic Layer Deposition journal January 2016
Observing the Nucleation Phase of Atomic Layer Deposition In Situ journal October 2012
The Problem with Determining Atomic Structure at the Nanoscale journal April 2007
Supervised Machine-Learning-Based Determination of Three-Dimensional Structure of Metallic Nanoparticles journal October 2017
Automated generation and ensemble-learned matching of X-ray absorption spectra journal March 2018
Classification of local chemical environments from x-ray absorption spectra using supervised machine learning journal March 2019
TiO 2 –ZnS Cascade Electron Transport Layer for Efficient Formamidinium Tin Iodide Perovskite Solar Cells journal November 2016
Solar cells with PbS quantum dot sensitized TiO 2 –multiwalled carbon nanotube composites, sulfide-titania gel and tin sulfide coated C-fabric journal January 2017
Performance enhancement of mesoporous TiO2-based perovskite solar cells by ZnS ultrathin-interfacial modification layer journal March 2018
Atomic layer deposition of ZnS via in situ production of H2S journal July 2010
Design of an atomic layer deposition reactor for hydrogen sulfide compatibility journal April 2010
Python Materials Genomics (pymatgen): A robust, open-source python library for materials analysis journal February 2013
VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data journal October 2011
Machine learning for molecular and materials science journal July 2018
Random Forests journal January 2001
Bias in random forest variable importance measures: Illustrations, sources and a solution journal January 2007
Polarized X-ray absorption spectroscopy and XPS of TiS3: S K- and Ti L-edge XANES and S and Ti 2p XPS journal June 2005
In Situ S K-Edge X-ray Absorption Spectroscopy for Understanding and Developing SO x Storage Catalysts journal October 2005
Reaction of H 2 S and S 2 with Metal/Oxide Surfaces:  Band-Gap Size and Chemical Reactivity journal June 1998
Adsorption and interaction of H2S/SO2 on TiO2 journal April 1999
Density Functional Theory Study of the Adsorption and Reaction of H 2 S on TiO 2 Rutile (110) and Anatase (101) Surfaces journal October 2009
Investigation of the H2S poisoning process for sensing composite material based on carbon nanotubes and metal oxides journal November 2016
The complete reaction mechanism of H 2 S desulfurization on an anatase TiO 2 (001) surface: a density functional theory investigation journal January 2017
Steps on anatase TiO2(101) journal July 2006
Atomic Layer Deposition of Zinc Oxide: Diethyl Zinc Reactions and Surface Saturation from First-Principles journal September 2016

Similar Records

In situ x-ray studies of the incipient ZnO atomic layer deposition on In0.53Ga0.47As
Journal Article · Mon Apr 27 00:00:00 EDT 2020 · Physical Review Materials · OSTI ID:1598269

Towards ALD thin film stabilized single-atom Pd 1 catalysts
Journal Article · Wed Jul 27 00:00:00 EDT 2016 · Nanoscale · OSTI ID:1598269

Ultrathin Amorphous Titania on Nanowires: Optimization of Conformal Growth and Elucidation of Atomic-Scale Motifs
Journal Article · Tue Apr 30 00:00:00 EDT 2019 · Nano Letters · OSTI ID:1598269