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Harnessing Hopping in Molecular-Scale Electronics: Approaching New Devices 'One Step at a Time'

Project description

Molecular electronics are hop, hop, hopping along

When you want to go across a busy road loaded with cars, one easy way to do it is to go through an underground tunnel. Quantum tunnelling is a quantum representation of the same concept for electrons. Organic molecular-scale electronics have increasingly used single-step tunnelling. Quantum tunnelling occurs due to the quantum wave nature of electrons and the fact that, when the electron wave hits the barrier, it does not stop abruptly; instead, it tapers off, with the probability that some of those electrons will end up on the other side. The potential of multi-step tunnelling or electron 'hopping' such as that in photosynthesis has not been harnessed. The EU-funded HOPELEC project is studying hopping processes in molecular-scale electronics with the goal of elucidating novel molecular-scale device mechanisms and enhancing our knowledge of biology and materials science.

Objective

With feature sizes of integrated circuits rapidly approaching molecular length scales, historical motivations to pursue the use of individual molecules in electronic circuits can no longer be justified based on their size alone. Instead, the focus has shifted towards the identification and exploitation of unusual transport phenomena unique to molecular materials (dominated by quantum mechanics) which can complement or supplant current silicon-based technologies. With the large majority of previous studies centered around the study of organic, redox-inactive molecules - typically transporting charge via single-step tunnelling processes - investigations of analogous systems that explicitly involve multi-step tunnelling, or ‘hopping’, behaviour are comparatively rare. In this project I propose to systematically study hopping processes in molecular-scale electronics (HOPELEC), with two primary objectives: (i) to construct the first single-molecule current oscillator; and (ii) probe under-explored current rectification mechanisms for single-molecule diodes. This highly interdisciplinary research area will involve the synthesis of new multi-site redox-active metal complexes capable of binding between nanoscale electrodes. Transport through these systems will be studied both at the single-molecule level using the scanning tunnelling microscope-based break junction technique, and in large area measurements using the eutectic Ga−In method. This work will expose new molecular-scale device mechanisms at the intersection of Marcus and Landauer theories, and contribute to our understanding of related processes in biology and materials science. Project results will be actively promoted through Outreach workshops on electronics/computation (translated also to YouTube). The extensive training, enhanced international profile, networks, and new experiences provided by this Fellowship will function as a 'springboard' in propelling me from Ph.D. student to independent research scholar.

Fields of science (EuroSciVoc)

Programme(s)

Topic(s)

Funding Scheme

MSCA-IF - Marie Skłodowska-Curie Individual Fellowships (IF)

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Call for proposal

(opens in new window) H2020-MSCA-IF-2019

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Coordinator

RIJKSUNIVERSITEIT GRONINGEN
Net EU contribution
€ 170 419,20
Address
Broerstraat 5
9712CP Groningen
Netherlands
Activity type
Higher or Secondary Education Establishments
Links
Total cost
€ 170 419,20

Partners (1)