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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.11 [2004] >
IJEMS Vol.11(6) [December 2004] >
| Title: | AC impedance studies on the molecular semiconductors based on aromatic diamines-iodine charge-transfer complexes |
| Authors: | Gupta, R K
Singh, R A |
| Issue Date: | Dec-2004 |
| Publisher: | CSIR |
| IPC Code: | Int. Cl.7 H03H 9/00, H01L |
| Abstract: | Molecular
semiconductors based on charge-transfer complexes of benzidine, o-olidine and N, N'-diphenylbenzidine
with iodine having different mole ratios have been prepared and characterized
by thermal, spectral and electrical methods. The thermal decomposition
behaviour of these materials indicate that they are thermally stable up to 130°C and then proceed to stoichiometric weight loss corresponding to
iodine and aromatic diamines respectively. The electrical conductivity has its
highest value for N, N'-diphenylbenzidine-iodine complexes
and lowest for benzidine-iodine complexes which may be due to more extensive
conjugation of radical cation in the former than in the later. Impedance
studies show (RC)(RC), R (RC) and (RC) equivalent circuit for benzidine, o-tolidine and N, N'-diphenylbenzidine-iodine
complexes respectively. The electrical data have been discussed in light of
dynamic bond percolation model in which the distribution, density and
availability of potential hopping sites change as a result of electronic and
structural changes in the material. |
| Page(s): | 505-510 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.11(6) [December 2004]
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