Modelling and verification of the electrical properties of organic dielectric monolayers in capacitive configurations

Publication Type:
Conference Proceeding
Proceedings of SPIE - The International Society for Optical Engineering, 2005, 5649 (PART 1), pp. 316 - 322
Issue Date:
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The possible role of self-assembled monolayers (SAMs) as the dielectric component of nanoscale capacitors is considered. SAMs of two rather different molecules, α,α-p-xylyldithiol ('XYL') and dodecanedithiol ('C12') were produced on a gold {111} substrate, and characterized with respect to their conductivity. The data were fitted with a double tunnel barrier model, in which the two SAMs are primarily differentiated by barrier height and thickness with that of XYL having a thickness of 1.0 nm and a barrier height of 0.78 eV compared to 1.69 nm and 1.39 eV for C12. The remaining parameters of the model were determined by Monte Carlo optimization. Assuming perfect connection of top and bottom electrodes, the leakage current through the XYL at 1 volt is calculated to be 1.4×105A/cm2, compared to 2.7×104A/cm2through C12. These values are not as low as can be obtained with SiO2of the same thickness. However, SAMs are readily and precisely produced by simple, low temperature processes, a factor which may allow them a niche in the future.
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