Structural Changes as a Function of Thickness in [(SnSe) 1+δ ] m TiSe 2 Heterostructures
Abstract
Single- and few-layer metal chalcogenide compounds are of significant interest due to structural changes and emergent electronic properties on reducing dimensionality from three to two dimensions. To explore dimensionality effects in SnSe, a series of [(SnSe)1+δ]mTiSe2 intergrowth structures with increasing SnSe layer thickness (m = 1-4) were prepared from designed thin-film precursors. In-plane diffraction patterns indicated that significant structural changes occurred in the basal plane of the SnSe constituent as m is increased. Scanning transmission electron microscopy cross-sectional images of the m = 1 compound indicate long-range coherence between layers, whereas the m >/= 2 compounds show extensive rotational disorder between the constituent layers. For m >/= 2, the images of the SnSe constituent contain a variety of stacking sequences of SnSe bilayers. Density functional theory calculations suggest that the formation energy is similar for several different SnSe stacking sequences. The compounds show unexpected transport properties as m is increased, including the first p-type behavior observed in (MSe)m(TiSe2)n compounds. The resistivity of the m >/- 2 compounds is larger than for m = 1, with m = 2 being the largest. At room temperature, the Hall coefficient is positive for m = 1 and negative for m = 2-4. Themore »
- Authors:
-
[1];
[1]
- Univ. of Oregon, Eugene, OR (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Oregon, Eugene, OR (United States)
- Publication Date:
- Research Org.:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1422879
- Report Number(s):
- NREL/JA-5K00-70991
Journal ID: ISSN 1936-0851
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Nano
- Additional Journal Information:
- Journal Volume: 12; Journal Issue: 2; Journal ID: ISSN 1936-0851
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; heterostructures; kinetic products; layered compound; low-dimensional materials; structural distortion; tin selenide
Citation Formats
Hamann, Danielle M., Lygo, Alexander C., Esters, Marco, Merrill, Devin R., Ditto, Jeffrey, Sutherland, Duncan R., Bauers, Sage R., and Johnson, David C. Structural Changes as a Function of Thickness in [(SnSe) 1+δ ] m TiSe 2 Heterostructures. United States: N. p., 2018.
Web. doi:10.1021/acsnano.7b07506.
Hamann, Danielle M., Lygo, Alexander C., Esters, Marco, Merrill, Devin R., Ditto, Jeffrey, Sutherland, Duncan R., Bauers, Sage R., & Johnson, David C. Structural Changes as a Function of Thickness in [(SnSe) 1+δ ] m TiSe 2 Heterostructures. United States. https://doi.org/10.1021/acsnano.7b07506
Hamann, Danielle M., Lygo, Alexander C., Esters, Marco, Merrill, Devin R., Ditto, Jeffrey, Sutherland, Duncan R., Bauers, Sage R., and Johnson, David C. Wed .
"Structural Changes as a Function of Thickness in [(SnSe) 1+δ ] m TiSe 2 Heterostructures". United States. https://doi.org/10.1021/acsnano.7b07506. https://www.osti.gov/servlets/purl/1422879.
@article{osti_1422879,
title = {Structural Changes as a Function of Thickness in [(SnSe) 1+δ ] m TiSe 2 Heterostructures},
author = {Hamann, Danielle M. and Lygo, Alexander C. and Esters, Marco and Merrill, Devin R. and Ditto, Jeffrey and Sutherland, Duncan R. and Bauers, Sage R. and Johnson, David C.},
abstractNote = {Single- and few-layer metal chalcogenide compounds are of significant interest due to structural changes and emergent electronic properties on reducing dimensionality from three to two dimensions. To explore dimensionality effects in SnSe, a series of [(SnSe)1+δ]mTiSe2 intergrowth structures with increasing SnSe layer thickness (m = 1-4) were prepared from designed thin-film precursors. In-plane diffraction patterns indicated that significant structural changes occurred in the basal plane of the SnSe constituent as m is increased. Scanning transmission electron microscopy cross-sectional images of the m = 1 compound indicate long-range coherence between layers, whereas the m >/= 2 compounds show extensive rotational disorder between the constituent layers. For m >/= 2, the images of the SnSe constituent contain a variety of stacking sequences of SnSe bilayers. Density functional theory calculations suggest that the formation energy is similar for several different SnSe stacking sequences. The compounds show unexpected transport properties as m is increased, including the first p-type behavior observed in (MSe)m(TiSe2)n compounds. The resistivity of the m >/- 2 compounds is larger than for m = 1, with m = 2 being the largest. At room temperature, the Hall coefficient is positive for m = 1 and negative for m = 2-4. The Hall coefficient of the m = 2 compound changes sign as temperature is decreased. The room-temperature Seebeck coefficient, however, switches from negative to positive at m = 3. These properties are incompatible with single band transport indicating that the compounds are not simple composites.},
doi = {10.1021/acsnano.7b07506},
journal = {ACS Nano},
number = 2,
volume = 12,
place = {United States},
year = {Wed Jan 31 00:00:00 EST 2018},
month = {Wed Jan 31 00:00:00 EST 2018}
}
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Figures / Tables:
Figure 1: Specular X-ray diffraction scans of [(SnSe)1+δ]mTiSe2 compounds (m = 1−4). The intensity is plotted on a log scale to enhance weak reflections. Miller indices are provided for select reflections, and asterisks indicate reflections from the Si substrate.
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