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Related Concept Videos

The Nernst Equation02:59

The Nernst Equation

41.5K
Nonstandard Reaction Conditions
The interconnection between standard cell potentials and various thermodynamic parameters such as the standard free energy change ΔG° and equilibrium constant K has been previously explored. For example, a redox reaction involving zinc(II) and tin(II) ions at 1 M concentration with Eºcell = +0.291 V and ΔG° = −56.2 kJ is spontaneous.
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SN2 Reaction: Mechanism02:27

SN2 Reaction: Mechanism

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The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
The presence of the more electronegative halogen in the substrate creates a polarized carbon-halide bond. The halide pulls the electron cloud generating an electrophilic center at the carbon atom. Thus, the carbon atom carries a partial positive charge while the halide has a...
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Atmospheric Pressure Fabrication of Large-Sized Single-Layer Rectangular SnSe Flakes
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Self-limiting stoichiometry in SnSe thin films.

Jonathan R Chin1, Marshall B Frye1, Derrick Shao-Heng Liu2

  • 1The School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA. lauren.garten@mse.gatech.edu.

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|June 5, 2023
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Self-limiting stoichiometry enables growth of large-scale tin selenide (SnSe) thin films. This method controls tin-to-selenium ratios, crucial for 2D material device applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Scaling 2D materials to the monolayer limit unlocks unique functionalities.
  • Achieving stoichiometric control in layered materials like tin selenide (SnSe) with strong van der Waals bonds is challenging.
  • Vertical growth and maintaining precise stoichiometry are key hurdles in 2D material fabrication.

Purpose of the Study:

  • To investigate the self-limiting stoichiometry mechanism in SnSe thin film growth via molecular beam epitaxy.
  • To understand how Sn:Se flux ratios influence SnSe phase stabilization and crystallographic orientation.
  • To identify methods for enhancing the lateral scale of SnSe layers for device applications.

Main Methods:

  • Molecular beam epitaxy (MBE) for SnSe thin film deposition.
  • ReaxFF molecular dynamics (MD) simulations to model cluster evolution and stoichiometry.
  • Raman spectroscopy to analyze phase transitions during film growth.
  • Transmission electron microscopy (TEM) to examine film microstructure and crystallographic orientation.

Main Results:

  • The Pnma phase of SnSe was stabilized across a wide Sn:Se flux ratio range (1:1 to 1:5).
  • Self-limiting stoichiometry was observed, with excess selenium forming clusters and minimally affecting SnSe stoichiometry.
  • Growth rates above 0.25 Å s-1 led to SnSe2 formation, disrupting SnSe crystallographic orientation.
  • Optimized conditions, avoiding SnSe2, increased the lateral scale of SnSe layers.

Conclusions:

  • Self-limiting stoichiometry is a viable strategy for controlled SnSe thin film growth.
  • Understanding and controlling secondary phase formation (SnSe2) is critical for large-scale SnSe layer growth.
  • This approach offers a promising route for fabricating large lateral-scale SnSe for advanced electronic and optoelectronic devices.