Related Experiment Video
Updated: Jan 16, 2026

Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
Published on: April 19, 2021
Correlation between the Electrical Properties and Formation Temperature of Self-assembled Monolayer-Based Molecular
Hyemin Lee1, Haeri Kim2, Donguk Kim1
1Department of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Korea.
None:
Self-assembled monolayers (SAMs) of molecules have been reported to exhibit improved structural quality when formed at elevated temperatures; however, this effect has long been ignored in the field of molecular electronics. In this study, electrical measurements such as current-voltage characteristics were combined with scanning tunneling microscopy (STM) images to analyze the correlation between the SAM formation temperature and the resulting electrical properties of SAM junctions using alkanethiol. Increasing the formation temperature enhanced the conductance of the SAM junctions, which is associated with the improved structural quality of the SAMs with fewer defects and larger domains. Additionally, the rectifying behavior was found to be related to the conductance of the SAMs. A close examination of the current-voltage characteristics revealed that rectification was due to an asymmetrical shift of the highest occupied molecular orbital (HOMO) under bias. Defects in SAMs account for rectification, as well as its correlation with conductance. Based on these observations, it was found that the formation temperature affects the electronic properties of the SAM junctions by controlling the defects. This study elucidates the causal relationship between the SAM formation process and the resulting electrical properties of SAM junctions.
Related Concept Videos
Metal-Semiconductor Junctions
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Biasing of Metal-Semiconductor Junctions
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Effects of Temperature on Free Energy
P-N junction
Electrostatic Boundary Conditions in Dielectrics
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....

