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Related Concept Videos

P-N junction01:11

P-N junction

484
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...
484
Biasing of P-N Junction01:16

Biasing of P-N Junction

456
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...
456
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

221
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...
221
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Schottky Barrier Diode01:27

Schottky Barrier Diode

311
Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
311
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

308
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...
308

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Photovoltage-Driven Photoconductor Based on Horizontal p-n-p Junction.

Feng Han1, Guanyu Mi2, Ying Luo2

  • 1School of Defence Science & Technology, Xi'an Technological University, No.2 Xuefu Middle Road, Xi'an 710021, China.

Nanomaterials (Basel, Switzerland)
|September 27, 2024
PubMed
Summary

A novel horizontal p-n-p junction photoconductor achieves high gain and responsivity by optimizing charge transport. This design balances device performance, overcoming limitations of traditional photoconductive gain theory.

Keywords:
p-n junctionphotoconductorphotodetectionphotovoltage

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Optoelectronics

Background:

  • Photoconductive gain is fundamentally limited by the trade-off between carrier lifetime and transit time.
  • Increasing carrier lifetime enhances gain but reduces device response speed.
  • Enhancing carrier mobility shortens transit time, boosting gain but increasing dark current and reducing sensitivity.

Purpose of the Study:

  • To propose a novel horizontal p-n-p junction-based photoconductor design.
  • To overcome the inherent limitations in photoconductive gain theory for high-performance photodetectors.
  • To achieve a balance between high responsivity, low dark current, and fast response speed.

Main Methods:

  • Design and theoretical analysis of a horizontal p-n-p junction photoconductor.
  • Utilizing the n-region as the charge transport channel, perpendicular to the p-n-p junction.
  • Leveraging space charge layer depletion and photovoltage effects for enhanced performance.

Main Results:

  • The proposed structure depletes the n-region channel via the space charge layer, ensuring low dark current.
  • Generated photovoltage compresses the space charge layer, expanding the conductive path and achieving high gain.
  • High responsivity and gain are achieved without requiring excessively long carrier lifetimes.

Conclusions:

  • The horizontal p-n-p junction design successfully balances responsivity, dark current, and response speed.
  • This approach offers a new strategy for designing high-performance photodetectors.
  • The design is applicable to both traditional and emerging nanomaterials for photodetector applications.