Variation of the contact resistance with electric current for gold electrodes on a squaraine single crystal
| Autor: | Günter Reiter, Jürgen Parisi, L. V. Govor |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Contact resistance Analytical chemistry Charge (physics) Surfaces and Interfaces Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystal Metal visual_art Electrode Materials Chemistry visual_art.visual_art_medium Electrical and Electronic Engineering Electric current Current (fluid) Single crystal |
| Zdroj: | physica status solidi (a). 212:2738-2746 |
| ISSN: | 1862-6300 |
| Popis: | We examined the dependence of the contact resistances between gold electrodes and a single crystal of small organic molecules, namely, squaraine (2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl]), on the electric current. Applying four gold electrodes on the crystal allows to measure twelve current–voltage () characteristics. The dependence of all eight contact resistances (four for the injecting and four for the extracting electrodes, respectively) on the electric current was determined. We found: (i) the contact resistance of all electrodes (ranging from to ) was larger than the resistance of the squaraine crystal (); (ii) for the same electrode, the values of the resistance for charge injection and charge extraction were different; (iii) the values of all contact resistances were not constant, but depended on the value of the current. Furthermore, each of the measured total I–V characteristics could be decomposed into three components representing charge transfer through the injecting electrode, the squaraine crystal, and the extracting electrode. We demonstrate that, for the correct interpretation of the I–V characteristics measured on metal/squaraine/metal structures, determination of the contact resistances at the interface between metal electrode and organic crystal is ultimately crucial. |
| Databáze: | OpenAIRE |
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