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

Title: Substrate-Dependent Study of Chain Orientation and Order in Alkylphosphonic Acid Self-Assembled Monolayers for ALD Blocking

Journal Article · · Langmuir

For years, many efforts in area selective atomic layer deposition (AS-ALD) have focused on trying to achieve high-quality self-assembled monolayers (SAMs), which have been shown by a number of studies to be effective for blocking deposition. In this work, we show that in some cases where a densely packed SAM is not formed, significant ALD inhibition may still be realized. The formation of octadecylphosphonic acid (ODPA) SAMs was evaluated on four metal substrates: Cu, Co, W, and Ru. The molecular orientation, chain packing, and relative surface coverage were evaluated using near-edge X-ray absorption fine structure (NEXAFS), Fourier transform infrared (FTIR) spectroscopy, and electrochemical impedance spectroscopy (EIS). ODPA SAMs formed on Co, Cu, and W showed strong angular dependence of the NEXAFS signal whereas ODPA on Ru did not, suggesting a disordered layer was formed on Ru. Additionally, EIS and FTIR spectroscopy confirmed that Co and Cu form densely packed, “crystal-like” SAMs whereas Ru and W form less dense monolayers, a surprising result since W-ODPA was previously shown to inhibit the ALD of ZnO and Al2O3 best among all the substrates. This work suggests that multiple factors play a role in SAM-based AS-ALD, not just the SAM quality. Therefore, metrological averaging techniques (e.g., WCA and FTIR spectroscopy) commonly used for evaluating SAMs to predict their suitability for ALD inhibition should be supplemented by more atomically sensitive methods. Finally, it highlights important considerations for describing the mechanism of SAM-based selective ALD.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC02-76SF00515; ECCS-1542152
OSTI ID:
1769359
Journal Information:
Langmuir, Vol. 36, Issue 43; ISSN 0743-7463
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (60)

ATHENA , ARTEMIS , HEPHAESTUS : data analysis for X-ray absorption spectroscopy using IFEFFIT journal June 2005
NEXAFS Spectroscopy book January 1992
On the potential of tungsten as next-generation semiconductor interconnects journal September 2017
Stability of Phosphonic Acid Self-Assembled Monolayers on Amorphous and Single-Crystalline Aluminum Oxide Surfaces in Aqueous Solution journal January 2010
Active MnO x Electrocatalysts Prepared by Atomic Layer Deposition for Oxygen Evolution and Oxygen Reduction Reactions journal June 2012
Area-Selective ALD with Soft Lithographic Methods: Using Self-Assembled Monolayers to Direct Film Deposition journal September 2009
CuCO 3 by XPS journal October 1998
Tuning the Work Function of Polar Zinc Oxide Surfaces using Modified Phosphonic Acid Self‐Assembled Monolayers journal September 2014
Assignment of NEXAFS Resonances in Alkanethiols and Their Implication on the Determination of Molecular Orientation of Aliphatic SAMs journal July 2018
Spontaneously organized molecular assemblies. 4. Structural characterization of n-alkyl thiol monolayers on gold by optical ellipsometry, infrared spectroscopy, and electrochemistry journal June 1987
Role of SAM Chain Length in Enhancing the Sensitivity of Nanopillar Modified Electrodes for Glucose Detection journal February 2009
Characterization of Cu surface cleaning by hydrogen plasma
  • Baklanov, M. R.; Shamiryan, D. G.; Tökei, Zs.
  • Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, Vol. 19, Issue 4 https://doi.org/10.1116/1.1387084
journal January 2001
Formation and Ripening of Self-Assembled Multilayers from the Vapor-Phase Deposition of Dodecanethiol on Copper Oxide journal July 2018
Real-Time Observation of Atomic Layer Deposition Inhibition: Metal Oxide Growth on Self-Assembled Alkanethiols journal July 2014
A New Resist for Area Selective Atomic and Molecular Layer Deposition on Metal–Dielectric Patterns journal May 2014
Area-Selective Deposition: Fundamentals, Applications, and Future Outlook journal May 2020
M ECHANISMS AND K INETICS OF S ELF -A SSEMBLED M ONOLAYER F ORMATION journal October 2001
Insulating Properties of Self-Assembled Monolayers Monitored by Impedance Spectroscopy journal May 2000
Vapor-deposited octadecanethiol masking layer on copper to enable area selective Hf 3 N 4 atomic layer deposition on dielectrics studied by in situ spectroscopic ellipsometry journal May 2018
Area-Selective Atomic Layer Deposition of Platinum on YSZ Substrates Using Microcontact Printed SAMs journal January 2007
Selective Deposition of Dielectrics: Limits and Advantages of Alkanethiol Blocking Agents on Metal–Dielectric Patterns journal November 2016
Self-Assembled Monolayer Formation on Copper: A Real Time Electrochemical Impedance Study journal August 2011
Carbon K -edge spectra of carbonate minerals journal July 2010
Trends in the Carbonyl Core (C 1S, O 1S) → π* C=O Transition in the Near-Edge X-ray Absorption Fine Structure Spectra of Organic Molecules journal August 2002
Impedance Spectroscopy of Self-Assembled Monolayers on Au(111):  Sodium Ferrocyanide Charge Transfer at Modified Electrodes journal May 1998
The orientation of Langmuir–Blodgett monolayers using NEXAFS journal March 1988
Effect of substrate composition on atomic layer deposition using self-assembled monolayers as blocking layers journal January 2016
Surface Modification of Titanium with Phosphonic Acid To Improve Bone Bonding:  Characterization by XPS and ToF-SIMS journal April 2002
Semiconductor self-assembled monolayers as selective contacts for efficient PiN perovskite solar cells journal January 2019
Self-assembled monolayer resist for atomic layer deposition of HfO2 and ZrO2 high-κ gate dielectrics journal May 2004
Influence of indium–tin oxide surface structure on the ordering and coverage of carboxylic acid and thiol monolayers journal June 2007
Modification of Electrode Surfaces by Self-Assembled Monolayers of Thiol-Terminated Oligo(Phenyleneethynylene)s journal January 2013
Characterizing the Molecular Order of Phosphonic Acid Self-Assembled Monolayers on Indium Tin Oxide Surfaces journal October 2011
Inhibiting Metal Oxide Atomic Layer Deposition: Beyond Zinc Oxide journal April 2017
Assembly of phosphonic acids on GaN and AlGaN journal December 2009
Carbon K-shell excitation spectra of linear and branched alkanes journal January 1987
Study of Insulating Properties of Alkanethiol Self-Assembled Monolayers Formed Under Prolonged Incubation Using Electrochemical Impedance Spectroscopy journal August 2012
Nanoscale detection of organic signatures in carbonate microbialites journal June 2006
Investigation of Self-Assembled Monolayer Resists for Hafnium Dioxide Atomic Layer Deposition journal February 2005
Fifteen Nanometer Resolved Patterns in Selective Area Atomic Layer Deposition—Defectivity Reduction by Monolayer Design journal October 2018
Self-Assembled Monolayers of Alkaneselenolates on (111) Gold and Silver journal March 2005
Area-Selective Atomic Layer Deposition Assisted by Self-Assembled Monolayers: A Comparison of Cu, Co, W, and Ru journal February 2019
Characterization of phosphonic acid binding to zinc oxide journal January 2011
Scanning Electrochemical Microscopy. 59. Effect of Defects and Structure on Electron Transfer through Self-Assembled Monolayers journal March 2008
Adsorption of Phosphonic Acid at the TiO 2 Anatase (101) and Rutile (110) Surfaces journal March 2009
Atomic Layer Deposition of Ruthenium with TiN Interface for Sub-10 nm Advanced Interconnects beyond Copper journal September 2016
Reaction Mechanism of Area-Selective Atomic Layer Deposition for Al 2 O 3 Nanopatterns journal November 2017
Determination of molecular orientations on surfaces from the angular dependence of near-edge x-ray-absorption fine-structure spectra journal November 1987
Highly Stable Monolayer Resists for Atomic Layer Deposition on Germanium and Silicon journal August 2006
XPS and XAS investigation of condensed and adsorbed n-octane on a Cu(110) surface journal February 2003
Bonding Self-Assembled, Compact Organophosphonate Monolayers to the Native Oxide Surface of Silicon journal December 2003
Surface Barrier Properties of Self-Assembled Monolayers as Deduced by Sum Frequency Generation Spectroscopy and Electrochemistry journal September 2011
Electrochemistry of redox-active self-assembled monolayers journal August 2010
Phosphonic Acid Modification of Indium−Tin Oxide Electrodes: Combined XPS/UPS/Contact Angle Studies journal April 2008
Selective Growth of Titanium Nitride on HfO 2 across Nanolines and Nanopillars journal July 2016
Self-Correcting Process for High Quality Patterning by Atomic Layer Deposition journal July 2015
The interactions of Co, Mn and water with calcite surfaces journal October 1992
Perspective: New process technologies required for future devices and scaling journal May 2018
The Removal of Copper Oxides by Ethyl Alcohol Monitored In Situ by Spectroscopic Ellipsometry journal January 2003
Monitoring and Mapping Imperfections in Silane-Based Self-Assembled Monolayers by Chemical Amplification journal August 2009