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Related Concept Videos

Schottky Barrier Diode01:27

Schottky Barrier Diode

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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...
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P-N junction01:11

P-N junction

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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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The Neuromuscular Junction01:19

The Neuromuscular Junction

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The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
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Anchoring Junctions01:03

Anchoring Junctions

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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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Adherens Junctions01:24

Adherens Junctions

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
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Gap Junctions01:27

Gap Junctions

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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Graphene-Assisted Quasi-van der Waals Epitaxy of AlN Film on Nano-Patterned Sapphire Substrate for Ultraviolet Light Emitting Diodes
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Graphene Schottky Junction on Pillar Patterned Silicon Substrate.

Giuseppe Luongo1,2, Alessandro Grillo3, Filippo Giubileo4

  • 1Physics Department "E. R. Caianiello", University of Salerno, via Giovanni Paolo II n. 132, 84084 Fisciano, Italy. giluongo@unisa.it.

Nanomaterials (Basel, Switzerland)
|April 28, 2019
PubMed
Summary

Researchers developed a graphene/silicon junction device with excellent light-sensing capabilities. This novel photodetector exhibits tunable electrical properties, making it suitable for advanced optoelectronic applications.

Keywords:
MOS (Metal Oxide Semiconductor) capacitorSchottky barrierdiodegrapheneheterojunctionphotodetectorresponsivity

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Graphene and silicon are key materials in semiconductor research.
  • Developing efficient graphene-silicon heterostructures is crucial for next-generation electronic and optoelectronic devices.

Purpose of the Study:

  • To fabricate and characterize a graphene/silicon junction device.
  • To investigate its rectifying behavior and photo-response properties.

Main Methods:

  • Fabrication of a graphene monolayer on a pillar-patterned silicon substrate.
  • Electrical characterization of the Schottky barrier, including bias and temperature dependence.
  • Photo-response measurements under light exposure.

Main Results:

  • A graphene/silicon junction with a 0.11 eV Schottky barrier and 2.6 ideality factor was achieved.
  • The device exhibited strongly bias- and temperature-dependent reverse current, explained by pillar-enhanced electric fields and thermal generation.
  • Photodetection capabilities were demonstrated with a 0.7% power conversion efficiency and 88 A/W photoresponsivity.

Conclusions:

  • The fabricated graphene/silicon junction demonstrates unique rectifying and photo-response characteristics.
  • The device's performance is tunable via applied voltage and temperature, offering potential for novel photodetector applications.