Molecular Electronics - Modeling, Devices and Architecture
Doktorsavhandling, 2010

Molecular electronics is an area of micro/nanoelectronics with a number of farreaching goals and challenges: denser implementation of electronic memory and logic, less expensive manufacturing, smaller or more sensitive measurement devices, selfassembly of devices and systems and, last but not least, exploring new science and applications. In recent years, molecular electronics has expanded into a broader field of molecular-scale electronics, partly because molecular components have to be defined in solid-state contexts via lithography and self-assembly, and effectively become hybrid devices with new and interesting properties. This thesis therefore provides an overview and critical assessment of recent experimental and theoretical development in the field of molecular-scale electronics, with focus on molecular-scale components for circuits and systems capable of performing information processing. The central part of this thesis is an in-depth investigation of one such device, the Nanocell, a self-assembled multi-terminal nanoelectronic switching network built from molecular (scale) linker elements with strongly non-linear and hysteretic current-voltage characteristics (IVC). The non-linearity involves negative differential resistance (NDR). The ground breaking generic new result is a demonstration, by programming from the edges without direct external access to individual links, how to configure the untrained Nanocell after fabrication and also how to reconfigure an already configured Nanocell to becoming a specific type of logic gate. The thesis also makes credible that the reconfiguration scheme is robust to most variations in the initial network topology. The thesis also contributes two theoretical investigations of normal and superconducting electron transport through molecular scale objects. One study demonstrates the importance of the molecular adsorption site (metal-molecule contact) for electron transport through a gold-sulfur-benzene-sulfur-gold (Au-DTB-Au) single-molecule junction. In particular, DTB and similar molecules with the terminal S-atoms buried in Au-vacancies shows prominent narrow transmission peaks close to the Fermi level, suggesting opportunities for devicing molecular switches and rectifiers. In the other transport investigation, it is shown that a quantum dot coupled to a phonon and positioned between two superconductors, can be used for Andreev Level spectroscopy.

Molecular electronics



threshold logic

switching networks

hybrid devices



reconfigurable logic


Kollektorn, MC2, Kemivägen 9, Chalmers
Opponent: Prof. Gianaurelio Cuniberti, Complex Nano Materials, TU Dresden, Germany


Jonas Sköldberg

Chalmers, Mikroteknologi och nanovetenskap (MC2), Elektronikmaterial och system

Critical roles of metal-molecule contacts in electron transport through molecular-wire junctions

Physical Review B,; Vol. 74(2006)p. 045401-

Artikel i vetenskaplig tidskrift

Spectrum of Andreev Bound States in a Molecule Embedded Inside a Microwave-Excited Superconducting Junction

Physical Review Letters,; Vol. 101(2008)p. 087002-

Artikel i vetenskaplig tidskrift

Nanocell Devices and Architecture for Configurable Computing With Molecular Electronics

IEEE Transactions on Circuits and Systems I: Regular Papers,; Vol. 54(2007)p. 2461-

Artikel i vetenskaplig tidskrift

Reconfigurable logic in nanoelectronic switching networks

Nanotechnology,; Vol. 18(2007)p. 485201-

Artikel i vetenskaplig tidskrift

Robustness of logic gates and reconfigurability of neuromorphic switching networks

Proceedings of 2010 IEEE International Symposium on Circuits and Systems (ISCAS),; (2010)p. 1671-1674

Paper i proceeding


Atom- och molekylfysik och optik

Annan fysik

Annan elektroteknik och elektronik

Den kondenserade materiens fysik



Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 3103

Kollektorn, MC2, Kemivägen 9, Chalmers

Opponent: Prof. Gianaurelio Cuniberti, Complex Nano Materials, TU Dresden, Germany