To further develop semiconductor technology, the field of molecular electronics is seeking to manufacture circuit components from individual molecules instead of silicon. Because of their unique electronic properties, molecules are suited to applications that cannot be implemented using conventional silicon technology. This requires reliable and inexpensive methods for creating electrical contacts at the two ends of a molecule.
Researchers have developed a technique that allows electrical contact to individual molecules to be established. Thousands of stable metal-molecule-metal components can be produced simultaneously by depositing a film of nanoparticles onto the molecules without compromising the properties of the molecules. This approach was demonstrated using alkane-dithiol compounds, which are made up of carbon, hydrogen, and sulfur.
The researchers used a type of sandwich construction in which an interlayer of molecules is brought into contact with metallic electrodes from above and below. The lower electrode consists of a layer of platinum coated with a layer of non-conducting material. Tiny pores are then etched into this layer to produce arbitrary patterns of compartments of different sizes, inside which there is an electrical contact with the platinum electrode.
The researchers then took advantage of the ability of certain molecules to self-assemble. Onto the pattern of pores, they applied a solution containing alkane-dithiol molecules that self-assemble into the pores, forming a densely packed monolayer film. Within this film, the individual molecules exhibit a regular arrangement and an electrical connection with the lower platinum electrode. Electrical contact with the molecular layer is established via an upper electrode made of gold nanoparticles.
The new technique largely resolves the issues that previously hampered the creation of electrical contacts to molecules such as high contact resistance or short circuits by filaments penetrating the film. Building blocks fabricated by this method can be operated under standard conditions and provide long-term stability. Moreover, the method can be applied to a variety of other molecular systems and opens up new avenues for integrating molecular compounds into solid-state devices. Its applications could include new types of instruments in the fields of sensor technology and medicine.