Correlation between the tonicity and the polarity in semiconductors

Abstract

Using the polarity with respect to energy gap Egrx, an empirical formula of tonicity factor is obtained for a specific class of semiconductors. The computation of tonicity character is distinguished with high degree of accuracy reaches that of other calculations like ab initio methods. Systematic behaviours are noticed in the calculated values of tonicities. It is seen that the experimental and calculated discrepancies for lll-V compounds are three times as for ll-VI ones. The results are in good agreement with that of Phillips and other authors.