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Use of Quantum Mechanical Calculations to Investigate Small Silicon Carbide Clusters

Use of Quantum Mechanical Calculations to Investigate Small Silicon Carbide Clusters

          
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About the Book

Silicon carbide (SiC) has a wide band gap at high temperature, a good candidate material to meet future Air Force needs for wide-band-gap semiconductor devices for optoelectronics and high power electronics in aerospace applications. Defects generated during growth and fabrication are largely responsible for degradation of SiC properties, so surface chemistry of SiC is very important in the surface fabrication and control of epitaxial SiC films. Computer simulation is an economic and efficient approach to model the surface chemistry of silicon carbide. A hybrid quantum mechanics/molecular mechanics (QM/MM) method had been proven a sufficient way to model bulk SiC surfaces. In this method a small cluster modeled by a QM method is embedded in a bulk framework that can be modeled by a MM method. The key to use the QM/MM to model silicon carbide surface chemistry is to find a QM method that can accurately model the silicon carbide clusters. Density Functional Theory (DFT) is chosen as a QM calculation method in this paper. Comparing the DFT calculation results with experimental results, the calculation results of geometry predictions, electron affinities (EA) and vibration frequencies are in good agreement with the experimental results. Sixteen optimized ground state structures were found using DFT:3BLYP method for the SimCn ... system. A root mean square average EA offset of -0.1 eV is found compared with the available experimental results. The factors that affect the accuracy of electron affinity calculation are discussed. The CPU time scaling of DFT calculations in SiC systems is also discussed.


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Product Details
  • ISBN-13: 9781288306299
  • Publisher: Biblioscholar
  • Publisher Imprint: Biblioscholar
  • Height: 246 mm
  • No of Pages: 122
  • Series Title: English
  • Weight: 236 gr
  • ISBN-10: 1288306296
  • Publisher Date: 01 Nov 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 7 mm
  • Width: 189 mm


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