Observation of current rectification by the new bimetallic iron(iii) hydrophobe [FeIII2(LN4O6)] on Au|LB-molecule|Au devices

In this work, we systematically studied the rectifying properties of molecular junction based on asymmetric tunneling and hopping charge transport in a single electronic state model using Landauer formula and Marcus theory. We first analyzed the asymmetric I-V characteristics and revealed distinct physical origins of the rectification under the two types of transports. We found significant difference in I-V characteristics of the two and the hopping transport can afford a much higher rectification ratio than tunneling. Next, the effect of key physical parameters on rectification performance under tunneling and hopping, like asymmetric factor, energy barrier, temperature and molecule-electrode coupling et al, were extensively evaluated, which provided a theoretical baseline for molecular diode design and performance modulation. At last, we further analyzed representative experimental results using the two models. We successfully reproduced the experimental results by adjusting the model parameters and revealed the coexistence of the tunneling and hopping processes in the ferrocene based molecular diode. The model method thus can work as powerful tool in mechanism analysis for the molecular rectification study.

Download Full-text

Molecular rectification: asymmetric current–voltage curves from self-assembled monolayers of a donor–(π-bridge)–acceptor dye

Journal of Materials Chemistry ◽

10.1039/b304465n ◽

2003 ◽

Vol 13 (7) ◽

pp. 1501-1503 ◽

Cited By ~ 37

Author(s):

Geoffrey J. Ashwell ◽

Richard Hamilton ◽

L. R. Hermann High

Keyword(s):

Self Assembled Monolayers ◽

Current Voltage ◽

Assembled Monolayers ◽

Molecular Rectification ◽

Self Assembled

Download Full-text

Ideal Current-voltage Characteristics and Rectification Performance of Molecular Rectifier under Single Level based Tunneling and Hopping Transport

10.26434/chemrxiv.12587438.v1 ◽

2020 ◽

Author(s):

Xianneng Song ◽

Xi Yu ◽

Wenping Hu

Keyword(s):

Experimental Results ◽

Physical Parameters ◽

Model Parameters ◽

Mechanism Analysis ◽

Hopping Transport ◽

Molecular Diode ◽

Current Voltage ◽

Significant Difference ◽

Molecular Rectification ◽

And Performance

In this work, we systematically studied the rectifying properties of molecular junction based on asymmetric tunneling and hopping charge transport in a single electronic state model using Landauer formula and Marcus theory. We first analyzed the asymmetric I-V characteristics and revealed distinct physical origins of the rectification under the two types of transports. We found significant difference in I-V characteristics of the two and the hopping transport can afford a much higher rectification ratio than tunneling. Next, the effect of key physical parameters on rectification performance under tunneling and hopping, like asymmetric factor, energy barrier, temperature and molecule-electrode coupling et al, were extensively evaluated, which provided a theoretical baseline for molecular diode design and performance modulation. At last, we further analyzed representative experimental results using the two models. We successfully reproduced the experimental results by adjusting the model parameters and revealed the coexistence of the tunneling and hopping processes in the ferrocene based molecular diode. The model method thus can work as powerful tool in mechanism analysis for the molecular rectification study.

Download Full-text

Current Rectification in a Single Silicon Nanowire p–n Junction

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.186 ◽

2008 ◽

Vol 8 (5) ◽

pp. 2419-2421 ◽

Cited By ~ 6

Author(s):

Yaswanth Rangineni ◽

Cheng Qi ◽

Gary Goncher ◽

Raj Solanki ◽

Kurt Langworthy

Keyword(s):

Electron Beam ◽

Silicon Nanowires ◽

Electron Beam Lithography ◽

Reverse Bias ◽

Silicon Nanowire ◽

Exponential Behavior ◽

Current Leakage ◽

Leakage Mechanism ◽

Current Voltage ◽

Current Rectification

Diodes within individual silicon nanowires were fabricated by doping them during growth to produce p–n junctions. Electron beam lithography was then employed to contact p- and n-doped ends of these nanowires. The current–voltage (I–V) measurements showed diode-like characteristics with a typical threshold voltage (Vt) of about 1 V and an ideality factor (n) of about 3.6 in the quasi-neutral region. The reverse bias I–V measurement showed an exponential behavior, indicating tunneling as the current leakage mechanism.

Download Full-text

Multifunctional Properties of (Z)-β-(N-Hexadecyl-4-quinolinium)-α-cyano-4-styryldicyanomethanide: a Molecular Rectifier, Optically Non-Linear Dye, and Ammonia Sensor

Australian Journal of Chemistry ◽

10.1071/ch01182 ◽

2002 ◽

Vol 55 (3) ◽

pp. 199 ◽

Cited By ~ 12

Author(s):

G. J. Ashwell ◽

G. A. N. Paxton

Keyword(s):

Second Harmonic ◽

Charge Transfer Band ◽

Lb Films ◽

Langmuir Blodgett ◽

Optical Susceptibility ◽

Current Voltage ◽

Air Water Interface ◽

Non Linear ◽

Molecular Rectification ◽

Molecular Rectifier

The zwitterionic dye, Z-β-(N-hexadecyl-4-quinolinium)-α-cyano-4-styryldicyanomethanide (C16H33-Q3CNQ), forms dimeric solution aggregates, which are probably centric, but adopt a non-centrosymmetric arrangement at the air/water interface. When spread from dilute solution, e.g. 3 × 10-5 M in CH2Cl2, the resultant Langmuir-Blodgett (LB) films are purple, λmax 563 ± 3 nm. They have an optimum effective second-order non-linear optical susceptibility of 75 pm V-1 at 1.064 μm and, when sandwiched between gold electrodes, exhibit asymmetric current-voltage curves, characteristic of molecular rectification. In contrast, when spread at slightly higher concentrations (e.g. 10-4 M), the resultant LB films are polymorphic and have absorption maxima at 563 and 670 nm, the latter being characteristic of the benzyl analogue (φ-CH2-Q3CNQ). Its films are turquoise, λmax 668 ± 3 nm, and both molecular rectification and second-harmonic generation are inhibited. Thus, the red-shifted charge-transfer band probably reflects an altered alignment whereby the molecules adopt a centric antiparallel arrangement within the monolayer. The zwitterionic films readily protonate, with bleaching, and may be used to sense ammonia at concentrations of ca. 1 ppm by monitoring changes in the surface plasmon resonance.

Download Full-text