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Title: The Instability of Monolayer-Thick PbSe on VSe2

Abstract

Two-dimensional monolayers derived from 3D bulk structures remain a relatively unexplored class of materials because of the challenge of stabilizing non-epitaxial interfaces. Here, we report an unusual reconstruction during the deposition of precursors when targeting the synthesis of heterostructures with an odd number of PbSe monolayers. Multilayer elemental precursors of Pb|Se + V|Se were deposited to have correct number of atoms to form [(PbSe)1+δ]q(VSe2)1 where q is the number of PbSe monolayers in the heterostructure. Structural analysis of the self-assembled precursor via xray reflectivity, x-ray diffraction, and HAADF-STEM suggests three different behaviors upon deposition. Precursors with q 7 and even values of q have the targeted nanoarchitectures after deposition which are maintained as the products are selfassembled through a near diffusionless process. Significant lateral surface diffusion occurred during deposition of precursors with q = 1, 3, and 5 resulting in the precursor having a different nanoarchitecture than targeted. Additional perpendicular long range diffusion occurs during self-assembly of these precursors resulting in different final products than targeted. DFT calculations of PbSe blocks show that the odd numbered layers are less stable than even numbered layers, which suggests an energetic driving force for the observed rearrangement. This work highlights the importance ofmore » understanding the reaction mechanism when attempting to prepare 2D layers of constituents with bulk 3D structures.« less

Authors:
ORCiD logo [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1];  [3];  [2];  [2]; ORCiD logo [1]
+ Show Author Affiliations
  1. Univ. of Oregon, Eugene, OR (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1721615
Report Number(s):
SAND-2020-12382J
Journal ID: ISSN 0897-4756; 691870
Grant/Contract Number:  
AC04-94AL85000
Resource Type:
Accepted Manuscript
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 32; Journal Issue: 18; Journal ID: ISSN 0897-4756
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Thickness; Precursors; Layers; Monolayers; Deposition

Citation Formats

Cordova, Dmitri Mesoza, Fender, Shannon Sanaya, Hooshmand, Mohammad Shahriar, Buchanan, Mina R., Davis, Joshua, Kam, Taryn Mieko, Gannon, Renae N., Fischer, Robert, Lu, Ping, Hanken, Benjamin E., Asta, Mark, and Johnson, David C. The Instability of Monolayer-Thick PbSe on VSe2. United States: N. p., 2020. Web. doi:10.1021/acs.chemmater.0c02922.
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Cordova, Dmitri Mesoza, Fender, Shannon Sanaya, Hooshmand, Mohammad Shahriar, Buchanan, Mina R., Davis, Joshua, Kam, Taryn Mieko, Gannon, Renae N., Fischer, Robert, Lu, Ping, Hanken, Benjamin E., Asta, Mark, & Johnson, David C. The Instability of Monolayer-Thick PbSe on VSe2. United States. https://doi.org/10.1021/acs.chemmater.0c02922
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Cordova, Dmitri Mesoza, Fender, Shannon Sanaya, Hooshmand, Mohammad Shahriar, Buchanan, Mina R., Davis, Joshua, Kam, Taryn Mieko, Gannon, Renae N., Fischer, Robert, Lu, Ping, Hanken, Benjamin E., Asta, Mark, and Johnson, David C. Fri . "The Instability of Monolayer-Thick PbSe on VSe2". United States. https://doi.org/10.1021/acs.chemmater.0c02922. https://www.osti.gov/servlets/purl/1721615.
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@article{osti_1721615,
title = {The Instability of Monolayer-Thick PbSe on VSe2},
author = {Cordova, Dmitri Mesoza and Fender, Shannon Sanaya and Hooshmand, Mohammad Shahriar and Buchanan, Mina R. and Davis, Joshua and Kam, Taryn Mieko and Gannon, Renae N. and Fischer, Robert and Lu, Ping and Hanken, Benjamin E. and Asta, Mark and Johnson, David C.},
abstractNote = {Two-dimensional monolayers derived from 3D bulk structures remain a relatively unexplored class of materials because of the challenge of stabilizing non-epitaxial interfaces. Here, we report an unusual reconstruction during the deposition of precursors when targeting the synthesis of heterostructures with an odd number of PbSe monolayers. Multilayer elemental precursors of Pb|Se + V|Se were deposited to have correct number of atoms to form [(PbSe)1+δ]q(VSe2)1 where q is the number of PbSe monolayers in the heterostructure. Structural analysis of the self-assembled precursor via xray reflectivity, x-ray diffraction, and HAADF-STEM suggests three different behaviors upon deposition. Precursors with q 7 and even values of q have the targeted nanoarchitectures after deposition which are maintained as the products are selfassembled through a near diffusionless process. Significant lateral surface diffusion occurred during deposition of precursors with q = 1, 3, and 5 resulting in the precursor having a different nanoarchitecture than targeted. Additional perpendicular long range diffusion occurs during self-assembly of these precursors resulting in different final products than targeted. DFT calculations of PbSe blocks show that the odd numbered layers are less stable than even numbered layers, which suggests an energetic driving force for the observed rearrangement. This work highlights the importance of understanding the reaction mechanism when attempting to prepare 2D layers of constituents with bulk 3D structures.},
doi = {10.1021/acs.chemmater.0c02922},
journal = {Chemistry of Materials},
number = 18,
volume = 32,
place = {United States},
year = {Fri Aug 21 00:00:00 EDT 2020},
month = {Fri Aug 21 00:00:00 EDT 2020}
}
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https://doi.org/10.1021/acs.chemmater.0c02922
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