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Related Experiment Videos

Molecules that mimic Schottky diodes.

Geoffrey J Ashwell1, Barbara Urasinska, Wayne D Tyrrell

  • 1The Nanomaterials Group, Cranfield University, Cranfield, UKMK43 0AL. g.j.ashwell@cranfield.ac.uk.

Physical Chemistry Chemical Physics : PCCP
|July 13, 2006
PubMed
Summary
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Self-assembled monolayers with sterically hindered dyes show high electrical rectification, achieving ratios up to 3000. This molecular asymmetry in donor-acceptor structures is key for electronic device applications.

Area of Science:

  • Molecular electronics
  • Organic electronics
  • Materials science

Background:

  • Self-assembled monolayers (SAMs) are crucial for molecular electronic devices.
  • Donor-(pi-bridge)-acceptor (D-pi-A) dyes are investigated for their electronic properties.
  • Electrical asymmetry in molecular junctions is a key area of research.

Purpose of the Study:

  • To investigate the current-voltage (I-V) characteristics of SAMs formed by cationic D-pi-A dyes and anionic donors.
  • To correlate the molecular structure of D-pi-A moieties with observed electrical rectification.
  • To explore the potential of these SAMs in creating asymmetric electronic devices.

Main Methods:

  • Fabrication of SAMs using specific cationic D-pi-A dyes and anionic counterions (e.g., copper phthalocyanine tetrasulfonate).

Related Experiment Videos

  • Contacting SAMs with gold (Au) or platinum-iridium (PtIr) probes.
  • Measurement of current-voltage (I-V) characteristics to determine rectification ratios.

    • Main Results:

    • High rectification ratios (up to 3000 at +/- 1 V) were observed for SAMs with sterically hindered, non-planar D-pi-A structures.
    • Lower rectification ratios (15-70 at +/- 1 V) were obtained for SAMs with sterically unhindered, planar D-pi-A structures.
    • The observed rectification is attributed to the broken conjugation in sterically locked D-pi-A moieties.

    Conclusions:

    • Steric hindrance in D-pi-A dyes significantly enhances electrical rectification in SAMs.
    • These molecular systems offer rectification ratios comparable to traditional metal-insulator-metal devices.
    • The findings highlight the potential of tailored molecular design for advanced electronic applications.