Double Core-Shell Semiconducting Molecular Chain Halogen-Bridged Metal Complexes with Ohmic Contact Heterojunctions

Area of Science:

• Materials Science
• Nanotechnology
• Solid-State Chemistry

Background:

• Fabricating low-dimensional heterostructures with atomic resolution is challenging.
• Previous work synthesized a 2D heterostructure from Ni- and Pd-based MX-Chains, revealing 1D heterojunctions.
• Characterization of low-dimensional heterojunctions at the atomic scale remains a significant hurdle.

Purpose of the Study:

• To fabricate and characterize novel double core-shell crystals (Ni-Pd-Ni) from MX-Chains.
• To investigate the electronic and optical properties of these molecule-based heterostructures.
• To demonstrate electrical conduction through 1D heterojunctions in a molecular system.

Main Methods:

• Stepwise electrochemical epitaxial method for crystal fabrication.
• UV-vis-NIR polarized reflectance microscopy for optical property analysis.
• Three-probe current-voltage measurements at varying temperatures.

Main Results:

• Successfully fabricated double core-shell (Ni-Pd-Ni) heterostructures from MX-Chains.
• Observed anisotropic optical properties due to aligned 1D electronic systems within the heterostructure.
• Demonstrated ohmic conduction through the double 1D heterojunctions, attributed to atomic-scale connections.

Conclusions:

• This work presents the first molecule-based heterostructure with electronic conductivity.
• Achieved electrical conduction through atomic-scale 1D heterojunctions in a molecular material.
• The findings pave the way for novel molecular electronic devices.