4.8 Article

Reversible 3D-2D structural phase transition and giant electronic modulation in nonequilibrium alloy semiconductor, lead-tin-selenide

Journal

SCIENCE ADVANCES
Volume 7, Issue 12, Pages -

Publisher

AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abf2725

Keywords

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Funding

  1. Ministry of Education, Culture, Sports, Science, and Technology (MEXT) through Element Strategy Initiative to Form Core Research Center [JPMXP0112101001]
  2. Dynamic Alliance for Open Innovation Bridging Human, Environment, and Materials from MEXT
  3. Japan Society for the Promotion of Science (JSPS) [19H02425, 20K21075]
  4. JSPS [20H02433]
  5. Grants-in-Aid for Scientific Research [20K21075, 20H02433, 19H02425] Funding Source: KAKEN

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This study proposed a design route for a direct three-dimensional to two-dimensional structural phase transition and successfully induced this transition in (Pb1-xSnx)Se alloy epitaxial films. The reversible giant electronic property change occurred during this transition process.
Material properties depend largely on the dimensionality of the crystal structures and the associated electronic structures. If the crystal-structure dimensionality can be switched reversibly in the same material, then a drastic property change may be controllable. Here, we propose a design route for a direct three-dimensional (3D) to 2D structural phase transition, demonstrating an example in (Pb1-xSnx)Se alloy system, where Pb2+ and Sn2+ have similar ns(2) pseudo-closed shell configurations, but the former stabilizes the 3D rock-salt-type structure while the latter a 2D layered structure. However, this system has no direct phase boundary between these crystal structures under thermal equilibrium. We succeeded in inducing the direct 3D-2D structural phase transition in (Pb1-xSnx)Se alloy epitaxial films by using a nonequilibrium growth technique. Reversible giant electronic property change was attained at x similar to 0.5 originating in the abrupt band structure switch from gapless Dirac-like state to semi-conducting state.

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