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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

502
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
502
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

330
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
330
Biasing of FET01:22

Biasing of FET

364
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
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Switching of BJT01:22

Switching of BJT

493
Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
493
Biasing of P-N Junction01:16

Biasing of P-N Junction

805
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
805

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Related Experiment Video

Updated: Sep 6, 2025

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Conductance Switching in Liquid Crystal-Inspired Self-Assembled Monolayer Junctions.

Julian M Dlugosch1, Henning Seim2, Achyut Bora1

  • 1Molecular Electronics, Technical University of Munich, Hans-Piloty-Straße 1, 85748 Garching, Germany.

ACS Applied Materials & Interfaces
|July 1, 2022
PubMed
Summary

We developed a novel ferroelectric tunnel junction (FTJ) using organic molecules. This molecular switch demonstrates robust, reversible conductance changes for potential use in advanced computing.

Keywords:
liquid crystalsmolecular electronicsresistive switchingself-assembled monolayertunnel junction

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Area of Science:

  • Materials Science
  • Molecular Electronics
  • Nanotechnology

Background:

  • Ferroelectric tunnel junctions (FTJs) are crucial for advanced electronics.
  • Existing FTJs often rely on inorganic materials, limiting functional complexity.
  • Developing novel FTJ architectures is essential for next-generation data storage.

Purpose of the Study:

  • To present a prototype ferroelectric tunnel junction (FTJ) based on self-assembled monolayers (SAMs) of functional organic molecules.
  • To demonstrate the electrically switchable behavior of these molecular SAMs as tunnel barriers.
  • To explore the potential of this organic FTJ for information storage and neuromorphic computing.

Main Methods:

  • Fabrication of Al/Al2O3/SAM/Pb/Ag stacks utilizing SAMs of small, functional molecules.
  • Characterization of device performance, including conductance switching and hysteresis.
  • Analysis of the switching mechanism using quantum chemistry, molecular dynamics, and tunneling resistance calculations.

Main Results:

  • Demonstrated a thin (3.4 ± 0.5 nm), uniform SAM-based tunnel barrier.
  • Observed pronounced hysteretic, reversible conductance switching at ±2-3 V with a high/low resistance ratio up to 100.
  • Confirmed the switching mechanism through theoretical calculations.

Conclusions:

  • Organic molecule-based SAMs offer a versatile platform for creating functional FTJs.
  • This approach allows for high functional complexity and simple, robust fabrication.
  • The developed FTJ technology shows promise for in-memory and neuromorphic computing applications.