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Related Concept Videos

Semiconductors01:22

Semiconductors

861
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
861
Types of Semiconductors01:20

Types of Semiconductors

899
Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
899
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

498
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...
498
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

460
Enhancement-mode MOSFETs are pivotal components in electronics, distinguished by their capacity to act as highly efficient switches. They are part of the larger family of metal-oxide Semiconductor Field-Effect Transistors (MOSFETs). They are available in two types: p-channel and n-channel, each tailored to specific polarity operations.
In their basic form, enhancement-mode MOSFETs are typically non-conductive when the gate-source voltage (Vgs) is zero. This default 'off' state means no...
460
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

328
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...
328
MOSFET01:16

MOSFET

566
The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
566

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Molecular-Switch-Embedded Solution-Processed Semiconductors.

Seong Hoon Yu1, Syed Zahid Hassan1, Chan So1

  • 1Department of Chemical Engineering, Pohang University of Science & Technology (POSTECH), Pohang, 37673, Republic of Korea.

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Summary

Molecular switches enable light-controlled, multi-functional optoelectronic devices by altering semiconductor properties. This review details mechanisms, challenges, and applications for photoprogrammable transistors, memory, and diodes.

Keywords:
molecular switchesmultifunctionalitiesoptoelectronicssemiconductorssolution processes

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Recent advances in solution-processed semiconductors and optoelectronic devices necessitate enhanced functionality.
  • Molecular switches offer a promising route to multifunctional optoelectronic devices by enabling light-induced property changes.

Purpose of the Study:

  • To review and classify optoelectronic transition mechanisms driven by molecular switches.
  • To discuss the characteristics and challenges of molecular switches in semiconductors.
  • To highlight novel applications of molecular switches in optoelectronics.

Main Methods:

  • Literature review and classification of molecular switch mechanisms in optoelectronic devices.
  • Analysis of semiconductor property modulation (trap-level, dielectric constant, etc.) by molecular switches.
  • Discussion of technical and scientific challenges and emerging applications.

Main Results:

  • Molecular switches can tune semiconductor parameters like charge mobility and polarity upon light stimulation.
  • Various mechanisms for light-driven optoelectronic transitions using molecular switches are identified and categorized.
  • Key challenges include stability, switching speed, and integration with semiconductor platforms.

Conclusions:

  • Molecular switches are crucial for developing photoprogrammable optoelectronic devices.
  • Further research is needed to overcome current limitations and unlock the full potential of these systems.
  • Emerging applications demonstrate the versatility of molecular switches beyond conventional uses.