Computational Modeling of Properties

By: Nasa, National Aeronautics and Space Adm

A simple model was developed to calculate the electronic transport parameters in disordered semiconductors in strong scattered regime. The calculation is based on a Green function solution to Kubo equation for the energy-dependent conductivity. This solution together with a rigorous calculation of the temperature-dependent chemical potential allows the determination of the dc conductivity and the thermopower. For wide-gap semiconductors with single defect bands, these transport properties are investigated as a function of defect concentration, defect energy, Fermi level, and temperature. Under certain conditions the calculated conductivity is quite similar to the measured conductivity in liquid 2-6 semiconductors in that two distinct temperature regimes are found. Under different conditions the conductivity is found to decrease with temperature; this result agrees with measurements in amorphous Si. Finally the calculated thermopower can be positive or negative and may change sign with temperature or defect concentration. Franz, Judy R. Unspecified Center...

• Format: Paperback
• Language: English
• ISBN: 1729318851
• ISBN13: 9781729318850
• Release Date: January 1
• Publisher: Independently Published
• Length: 54 Pages
• Weight: 0.33 lbs.
• Dimensions: 0.1" x 8.5" x 11.0"