Hopping conduction in thin films of tetrathiotetracene
- 14 August 1979
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 12 (15) , 3173-3183
- https://doi.org/10.1088/0022-3719/12/15/025
Abstract
Measurements of the AC and DC conductivity of vacuum-deposited thin films of tetrathiotetracene are described. Long-range potential wells associated with TTT-oxygen complexes play a dominant role in the transport process. In particular DC conduction requires movement between these wells while AC conduction occurs between sites within the wells. A density of states of approximately 1019cm-3 calculated from the AC data is in agreement with the density of carriers determined from an electron spin resonance study. High-field measurements are analysed in terms of a Poole-Frenkel effect, which gives a barrier height of 0.26 eV compared to a DC activation energy of 0.28 eV.Keywords
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