Electrostatic Properties of Ideal and Non-ideal Polar Organic Monolayers: Implications for Electronic Devices

• Published in: Advanced materials (Weinheim) Vol. 19; no. 23; pp. 4103 - 4117
• Main Authors: Natan, A., Kronik, L., Haick, H., Tung, R. T.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 03-12-2007; WILEY‐VCH Verlag
• Subjects: Molecular electronics; Monolayers; Polar monolayers; Polar organic materials
• ISSN: 0935-9648; 1521-4095
• DOI: 10.1002/adma.200701681

Molecules in (or as) electronic devices are attractive because the variety and flexibility inherent in organic chemistry can be harnessed towards a systematic design of electrical properties. Specifically, monolayers of polar molecules introduce a net dipole, which controls surface and interface barriers and enables chemical sensing via dipole modification. Due to the long range of electrostatic phenomena, polar monolayer properties are determined not only by the type of molecules and/or bonding configuration to the substrate, but also by size, (dis‐)order, and adsorption patterns within the monolayer. Thus, a comprehensive understanding of polar monolayer characteristics and their influence on electronic devices requires an approach that transcends typical chemical designs, i.e., one that incorporates long‐range effects, in addition to short‐range effects due to local chemistry. We review and explain the main uses of polar organic monolayers in shaping electronic device properties, with an emphasis on long‐range cooperative effects and on the differences between electrical properties of uniform and non‐uniform monolayers.
The properties of polar organic monolayers and their main uses in shaping the properties of electronic devices are reviewed and explained. We emphasize the role of long‐range, cooperative effects and the differences between the electrical properties of uniform and non‐uniform monolayers.