Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5375233 | Chemical Physics | 2009 | 9 Pages |
Abstract
The measurements of electric permittivities, of electric DC conductivity, and of the current-voltage characteristics at various temperatures and field frequencies were performed for the single crystals of 3-nitroaniline (m-NA). The 1.77Â eV energy gap in the band structure, calculated by quantum chemical methods, is compared with the electronic transitions energies known from literature and with the experimentally found 0.40Â eV activation energy of conductivity. The sign reversal of the current during the switch-on/off of the 980Â nm diode laser beam and of the applied voltage seems to originate from the electrooptic Pockels effect and to be connected with the dynamical disorder in the crystal. The appearance of the current confirm the generation and detrapping of charge carriers (polarons) by near IR (NIR) radiation. These data indicate the electret features of the crystal. The mechanisms of electric conductivity and optical nonlinearity in the solid m-NA are proposed.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
M. Magdalena Szostak, Henryk Chojnacki, Elżbieta Staryga, Maciej DÅużniewski, Grzegorz W. BÄ
k,