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Transport Properties of a Single-Molecule Diode
- Transport Properties of a Single-Molecule Diode
- Loertscher, Emanuel; Gotsmann, Bernd; Lee, Youngu; Yu, Luping; Rettner, Charles; Riel, Heike
- DGIST Authors
- Lee, Youngu
- Issue Date
- ACS Nano, 6(6), 4931-4939
- Article Type
- Applied Bias; Bias Voltage; Biphenyl; Biphenyl Compounds; Biphenyl Derivative; Chemical Model; Chemistry; Computer-Aided Design; Computer Simulation; Conductance Histograms; Current Voltage Characteristics; Diblocks; Donor and Acceptor; Electric Conductivity; Electric Rectifiers; Electron Transport; Equipment; Equipment Design; Equipment Failure Analysis; Instrumentation; Level-Shifting; Materials Testing; Mechanically Controllable Break-Junction; Models, Chemical; Molecular Electronics; Molecular Energy Levels; Molecular Junction; Molecules; Nanoparticle; Nanoparticles; Nanotechnology; Non-Symmetric; Rectification; Semiconductor; Semiconductors; Semiempirical Models; Single-Molecule; Single-Molecule Transport; Temperature Range; Transport Properties; Ultrastructure; Variable Coupling; Voltage Drop
- Charge transport through single diblock dipyrimidinyl diphenyl molecules consisting of a donor and acceptor moiety was measured in the low-bias regime and as a function of bias at different temperatures using the mechanically controllable break-junction technique. Conductance histograms acquired at 10 mV reveal two distinct peaks, separated by a factor of 1.5, representing the two orientations of the single molecule with respect to the applied bias. The current-voltage characteristics exhibit a temperature-independent rectification of up to a factor of 10 in the temperature range between 300 and 50 K with single-molecule currents of 45-70 nA at ±1.5 V. The current-voltage characteristics are discussed using a semiempirical model assuming a variable coupling of the molecular energy levels as well as a nonsymmetric voltage drop across the molecular junction, thus shifting the energy levels accordingly. The excellent agreement of the data with the proposed model suggests that the rectification originates from an asymmetric Coulomb blockade in combination with an electric-field-induced level shifting. © 2012 American Chemical Society.
- American Chemical Society
- Related Researcher
Organic & Printed Electronics Laboratory(OPEL)
OTF Solar cell; OLED; Printed Electronics; 유기박막형 태양전지; OLED; Printed Electronics
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- Department of Energy Science and EngineeringOrganic & Printed Electronics Laboratory(OPEL)1. Journal Articles
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