Field-Induced Conductance Change of Thin Organic Films Measured using Trench-Type Electrodes
| Autor: | Wataru Mizutani, Kiyomi Tsukagoshi, Kazuhiro Murata, Hiroaki Azehara |
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| Rok vydání: | 2003 |
| Předmět: | |
| Zdroj: | Japanese Journal of Applied Physics. 42:4535-4539 |
| ISSN: | 1347-4065 0021-4922 |
| DOI: | 10.1143/jjap.42.4535 |
| Popis: | We studied field-induced conductance change of thin organic films using the trench-type electrodes, where the gate field is applied from the sidewall of the trench. We fabricated the electrodes, and observed field effects of a conductive self-assembled film and oligothiophene thin films. The electric field generated by the electrode structure was calculated by a two-dimensional finite element method. The gate field strength becomes weaker as the film thickness is reduced, while the fields generated by the source–drain potential increase. This result denies the `normally-off' characteristics since a small source–drain voltage between the nano-gap could cause the conductance change corresponding to the large gate voltage. Although three-dimensional structures or interface roughness could enhance the effective gate fields, we speculated that the self-assembled film showing the field effects was not a monolayer, but most probably multilayers or mounds of aggregated molecules of more than 10 nm thickness. |
| Databáze: | OpenAIRE |
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