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Related Concept Videos

Field Effect Transistor01:29

Field Effect Transistor

Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
MOSFET: Enhancement Mode01:22

MOSFET: Enhancement Mode

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 current...
MOSFET: Depletion Mode01:20

MOSFET: Depletion Mode

Depletion-mode MOSFETs represent a unique subset of MOSFET technology, functioning fundamentally differently from their enhancement-mode counterparts. Unlike enhancement MOSFETs, which require a positive gate-source voltage (Vgs) to turn on, depletion-mode MOSFETs are inherently conductive and "normally on" devices.
The primary characteristic of depletion-mode MOSFETs is their ability to conduct current between the drain and source terminals without gate bias. This inherent conductivity arises...
P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
Electrochemical Systems01:24

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...
Characteristics of MOSFET01:17

Characteristics of MOSFET

Metal-oxide-semiconductor field-effect Transistors, or MOSFETs, play a critical role in electronic circuits. They are primarily utilized for amplifying and switching signals.
Various vital parameters influence their functionality, which is crucial for theory and electronics applications. First, channel dimensions, precisely length, and width, are pivotal. The size of these channels affects the transistor's ability to carry current and switching speeds; shorter channels typically enable quicker...

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Charge injection in solution-processed organic field-effect transistors: physics, models and characterization

Dario Natali1, Mario Caironi

  • 1Center for Nano Science and Technology @ PoliMi, Istituto Italiano di Tecnologia, Milano, Italy.

Advanced Materials (Deerfield Beach, Fla.)
|February 23, 2012
PubMed
Summary
This summary is machine-generated.

Efficient current injection is crucial for high-performance organic thin-film transistors (OTFTs). Optimizing metal-semiconductor interfaces and developing standardized strategies are key for advancing printed organic electronics.

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In Vitro Multiparametric Cellular Analysis by Micro Organic Charge-modulated Field-effect Transistor Arrays

Published on: September 20, 2021

Area of Science:

  • Organic electronics
  • Materials science
  • Semiconductor physics

Background:

  • High-mobility organic semiconductors in field-effect transistors (FETs) do not inherently guarantee high performance.
  • Device performance is critically dependent on efficient charge injection from contacts, especially in downscaled, short-channel devices.
  • Current limitations in organic electronics stem from inadequate charge supply and voltage drops at the metal-semiconductor interface.

Purpose of the Study:

  • To provide a comprehensive review of current injection in organic thin-film transistors (OTFTs).
  • To discuss physical principles, models, interface tuning technologies, and characterization techniques for charge injection.
  • To highlight recent advancements, with an emphasis on solution-processed transistors for scalable manufacturing.

Main Methods:

  • Review of fundamental physical principles governing energy level alignment at interfaces.
  • Analysis of models describing charge injection mechanisms in OTFTs.
  • Survey of technologies for interface engineering and device characterization techniques.

Main Results:

  • Solution-processed OTFTs, excluding electrolyte-gated types, report contact resistances around 10 kΩ·cm for mobilities of 0.1-1 cm²/Vs.
  • These contact resistances limit downscaling of channel lengths below a few micrometers, hindering device switching speed.
  • Recent progress shows more general approaches to reduce contact resistance due to improved understanding of metal-semiconductor interfaces.

Conclusions:

  • Efficient current injection is a critical bottleneck for achieving high performance in organic electronics, particularly for printed applications.
  • A lack of standardized strategies for interface management has historically impeded progress.
  • Combined scientific and technological efforts to understand contact phenomena and master interface tailoring are essential for advanced organic electronics.