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Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
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The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
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First-principles design of g-C

Yuliang Mao1, Zhiwei Zhang1, Xing Zhou1

  • 1Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, School of Physics and Optoelectronics, Xiangtan University, Hunan 411105, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 2, 2023
PubMed
Summary

This study explores graphitic carbon nitride/hafnium disulfide selenide (g-C3N4/HfSSe) heterojunctions. These stable heterojunctions exhibit direct band gaps and excellent light absorption across UV, visible, and near-infrared regions.

Keywords:
built-in electric fieldfirst-principlesg-C3N4/HfSSe heterojunctiontype-II band alignment

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Graphitic carbon nitride (g-C3N4) and hafnium disulfide selenide (HfSSe) are promising 2D materials.
  • Heterojunctions formed by stacking different 2D materials offer unique electronic and optical properties.

Purpose of the Study:

  • To systematically investigate the structural, electronic, and optical properties of g-C3N4/HfSSe heterojunctions.
  • To determine the stability and band alignment of different stacking configurations.
  • To assess the light absorption capabilities of these heterojunctions.

Main Methods:

  • First-principles calculations were employed to model the heterojunctions.
  • Binding energies were calculated to assess the stability of various stacking arrangements.
  • Electronic band structures and optical absorption spectra were computed.

Main Results:

  • Two stable heterojunctions, g-C3N4/SHfSe and g-C3N4/SeHfS, were identified.
  • Both heterojunctions exhibit direct band gaps and type II band alignment.
  • Formation of a built-in electric field due to charge rearrangement at the interface.
  • Excellent light absorption was predicted in the ultraviolet, visible, and near-infrared regions.

Conclusions:

  • The g-C3N4/HfSSe heterojunctions are stable and possess favorable electronic properties for optoelectronic applications.
  • The type II band alignment and built-in electric field are beneficial for charge separation.
  • These heterojunctions demonstrate significant potential for light harvesting applications.