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Si78 double cage structure and special optical properties.

Li-Zhen Zhao1, Wen-Cai Lu, Wan-Sheng Su

  • 1College of Physics and Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao, Shandong 266071, P. R. China. zhaolz@qdu.edu.cn wencailu@jlu.edu.cn.

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Summary

Hydrogen passivation significantly alters silicon cluster stability and optical properties. Unpassivated clusters favor double cages, while hydrogenated ones prefer diamond structures, impacting their electronic and optical behavior.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid-State Physics

Background:

  • Silicon clusters are fundamental building blocks for nanomaterials.
  • Understanding their structural and electronic properties is crucial for technological applications.
  • Hydrogen passivation is a key method to tune cluster behavior.

Purpose of the Study:

  • Investigate the structural stability of silicon78 (Si78) clusters.
  • Examine the effects of hydrogen passivation on Si78 cluster stability and properties.
  • Analyze the optical and electronic characteristics of different Si78 isomers.

Main Methods:

  • Employed first-principles calculations for accurate electronic structure determination.
  • Studied both hydrogenated and unpassivated Si78 cluster isomers.
  • Calculated infrared (IR) vibration spectra, ionization potentials (IP), and electronic density-of-states (DOS).

Main Results:

  • An endohedral double cage isomer is more stable for unpassivated Si78 clusters.
  • Hydrogen passivation favors the diamond-like structure over the double cage.
  • Hydrogenated double cage and diamond-like structures exhibit blue shifts into visible and UV regions, respectively.

Conclusions:

  • Hydrogen passivation dramatically influences the preferred structure and stability of Si78 clusters.
  • The calculated optical properties suggest potential applications in optoelectronics.
  • First-principles calculations provide valuable insights into silicon cluster behavior.