2020
DOI: 10.1021/acs.chemmater.0c02922
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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 nonepitaxial 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 the correct number of atoms to form [(PbSe) 1+δ ] q (VSe 2 ) 1 where q is the number of PbSe monolayers … Show more

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Cited by 6 publications
(12 citation statements)
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“…In-plane diffraction data collected after annealing at 250 °C (Figure b) contains intensity maxima that can be indexed as hk 0 reflections coming from independent hexagonal and square lattices. The lattice parameter of the hexagonal phase (3.44 Å, computationally 3.46 Å) is close to that found for VSe 2 monolayers in ([PbSe] 1.1 ) m VSe 2 compounds . The lattice parameter of the square phase (5.99 Å) is close to that found for rock-salt structured PbSe bilayers in (PbSe) 1.1 VSe 2 .…”
Section: Resultssupporting
confidence: 78%
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“…In-plane diffraction data collected after annealing at 250 °C (Figure b) contains intensity maxima that can be indexed as hk 0 reflections coming from independent hexagonal and square lattices. The lattice parameter of the hexagonal phase (3.44 Å, computationally 3.46 Å) is close to that found for VSe 2 monolayers in ([PbSe] 1.1 ) m VSe 2 compounds . The lattice parameter of the square phase (5.99 Å) is close to that found for rock-salt structured PbSe bilayers in (PbSe) 1.1 VSe 2 .…”
Section: Resultssupporting
confidence: 78%
“…The lattice parameter of the hexagonal phase (3.44 Å, computationally 3.46 Å) is close to that found for VSe 2 monolayers in ([PbSe] 1.1 ) m VSe 2 compounds. 36 The lattice parameter of the square phase (5.99 Å) is close to that found for rock-salt structured PbSe bilayers in (PbSe) 1.1 VSe 2 . An atomic-scale The calculated structure of (Pb 2 MnSe 3 ) 0.6 VSe 2 , determined using a unit cell containing a complete layer of VSe 2 (25 unit cells) and a complete layer of Pb 2 MnSe 3 (15 unit -cells), agrees well with the unit cell determined via a Le Bail refinement of the experimental diffraction data.…”
Section: ■ Methodssupporting
confidence: 71%
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“…systematically predicted the optoelectronic properties of PbSe monolayers as well as their potential applications in optoelectronic and photovoltaic devices. [ 18c ] However, the present research has mostly been focused on the PbSe‐based composites (such as graphene/PbSe, [ 27 ] PbSe/VSe 2 , [ 28 ] PbSe/MoS 2 , [ 29 ] PbSe/GeS, [ 30 ] and PbSe/Bi 2 O 2 Se), [ 31 ] while the practical applications of pristine PbSe NCs are still unrevealed. Moreover, it has been proven challenging to synthesize high‐yield PbSe NCs from conventional precursors (such as tri‐ n ‐alkylphosphine selenides) and the as‐fabricated PbSe NCs also suffer from poor air stability.…”
Section: Introductionmentioning
confidence: 99%