Design and characterization of novel systems for molecular nanoscale self-assembly

作者：Burtman Vladimir^*; Vardeny Zeev Valy

来源：Japanese Journal of Applied Physics, 2008, 47(2): 1165-1172.

DOI：10.1143/JJAP.47.1165

• molecular nanoelectronics
• self-assembled monolayer
• two-terminal molecular devices
• charge delocalization in organics

We describe a new molecular engineering approach based on self-assembled monolayers (SAM) that has the potential of fine structure tunability in molecular diodes from isolated molecular wires to two dimensional (2D) aggregates; this approach should be useful for studying dimensionality transition in molecular diodes. Using this technique, we have fabricated a variety of molecular diodes with structure tunability of two-component solid-state mixtures. These are molecular wires (1,4-methanebenzene-dithiol; Me-BDT) and molecular insulator spacers (1-pentanethiol; PT). SAM-based two-terminal devices were prepared at various concentration ratios (r) of wires/spacers, sandwiched between two gold electrodes. The transport properties of molecular diodes at low r values (r < 10(-3)) are dominated by the isolated molecular wires dispersed in the dielectric spacer matrix; we conclude that these are one-dimensional (1D)-type devices. At high r values (r > 10(-3)), aggregates of molecular wires are formed in the PT matrix that show additional in-plane order; we conjecture that these are 2D-type devices.

• 出版日期2008-2