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Related Concept Videos

Bipolar Junction Transistor01:22

Bipolar Junction Transistor

Bipolar Junction Transistors (BJTs) are essential elements in electronic circuits, playing a crucial role in the functionality of amplifiers, memories, and microprocessors. These transistors can be designed as NPN or PNP based on their doping patterns. They consist of three layers: the emitter, base, and collector. The configuration of these layers and their respective doping levels—with N-type or P-type impurities—define the transistor's type and its operational characteristics.
The structure...
Working Principle of BJT01:15

Working Principle of BJT

A Bipolar Junction Transistor (BJT), specifically a PNP transistor in a common-base configuration, effectively amplifies or switches electronic signals by controlling the flow of charge carriers. This discussion focuses on its operation in the active mode.
In the PNP configuration, the emitter is heavily doped with positive charge carriers (holes), while the base is lightly doped with negative carriers (electrons). This setup allows for a forward bias across the emitter-base junction,...
Modes of Operations of BJT01:21

Modes of Operations of BJT

A Bipolar Junction Transistor (BJT) is a versatile component in electronics, functioning in four distinct modes based on the biasing of its junctions: active, saturation, cut-off, and inverted modes.
Active Mode: The most common mode for amplification, the active mode features a forward-biased emitter-base junction and a reverse-biased base-collector junction. This setup enables electrons to be injected from the emitter to the base while blocking the majority carriers at the collector. The...
Configurations of BJT01:16

Configurations of BJT

Bipolar Junction Transistors (BJTs) are categorized into various types based on their configurations, each with distinct characteristics and applications. The configurations are primarily differentiated by which terminal—base, emitter, or collector—is common to both the input and output circuits.
The common base configuration is noted for its high voltage gain, positioning it as an ideal choice for single-stage amplifier circuits, such as microphone pre-amplifiers. A notable characteristic of...
Biasing of P-N Junction01:16

Biasing of P-N Junction

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...
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...

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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
14:37

Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

Published on: November 5, 2014

Toward complementary ionic circuits: the npn ion bipolar junction transistor.

Klas Tybrandt1, Erik O Gabrielsson, Magnus Berggren

  • 1Department of Science and Technology, Organic Electronics, Linköping University, SE-601 74 Norrköping, Sweden.

Journal of the American Chemical Society
|May 24, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel npn ion bipolar junction transistor (npn-IBJT) for controlling ionic currents. This transistor actively modulates the delivery of charged biomolecules like glutamic acid, paving the way for new chemical circuits.

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Area of Science:

  • Biomolecule transport
  • Ionic current control
  • Chemical circuits

Background:

  • Charged biomolecules can be transported via ionic currents.
  • Development of addressable ionic delivery circuits is an ongoing challenge.

Purpose of the Study:

  • To develop an active control element for anionic currents.
  • To demonstrate actively modulated delivery of the neurotransmitter glutamic acid.

Main Methods:

  • Development of a npn ion bipolar junction transistor (npn-IBJT).
  • Utilized ion exchange layers and conjugated polymers as functional materials.
  • Tested transistor stability and ion current switch times.

Main Results:

  • The npn-IBJT demonstrated stable transistor characteristics over extended operation.
  • Achieved ion current switch times below 10 seconds.
  • Successfully modulated the delivery of glutamic acid.

Conclusions:

  • The npn-IBJT serves as a viable active control element for ionic currents.
  • Results suggest the potential for complementary chemical circuits analogous to electronic circuits.