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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Microgravity-activated high-performance van der Waals InSe ferroelectric semiconductor.

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  • 1Key Laboratory of Polar Materials and Devices (MOE), School of Information and Electronic Engineering, East China Normal University, Shanghai, China.

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|March 13, 2026
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Summary
This summary is machine-generated.

Growing indium selenide (InSe) in space microgravity eliminates defects, enabling intrinsic ferroelectricity. This leads to advanced transistors and near-infrared light sources for integrated computing.

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Semiconductor Science

Background:

  • Van der Waals layered materials exhibit unique properties due to low interlayer sliding energy.
  • Microgravity environments offer unique conditions for crystal growth, potentially overcoming terrestrial limitations.
  • Indium selenide (InSe) is a promising van der Waals material with potential applications in electronics and optoelectronics.

Purpose of the Study:

  • To investigate the structural and property changes of InSe grown in a microgravity environment.
  • To explore the potential of space-grown InSe for advanced electronic and optical devices.
  • To demonstrate a novel method for producing high-quality van der Waals materials.

Main Methods:

  • Cultivation of InSe single crystals in the microgravity environment of the China space station.
  • Atomic-level microstructure analysis using advanced microscopy techniques.
  • Fabrication and characterization of ferroelectric semiconductor field-effect transistors (FeFETs).
  • Evaluation of amplified spontaneous emission properties.

Main Results:

  • Microgravity growth successfully eliminated stacking faults in InSe, activating intrinsic sliding ferroelectricity with high retention.
  • FeFETs fabricated from space-grown InSe exhibited large non-volatile memory windows, high on/off ratios, and excellent mobility.
  • Superior amplified spontaneous emission was observed with exceptionally low photon excitation thresholds.
  • Demonstrated potential for near-infrared nonlinear light sources.

Conclusions:

  • Space microgravity provides an effective strategy for producing high-quality, defect-free van der Waals InSe.
  • The activated ferroelectricity and enhanced properties of microgravity-grown InSe are suitable for next-generation memory and sensor applications.
  • These findings pave the way for emitter-integrated computing architectures.