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Diode: Forward bias01:20

Diode: Forward bias

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In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
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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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A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
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A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...
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The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
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Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
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All-printed diode operating at 1.6 GHz.

Negar Sani1, Mats Robertsson1, Philip Cooper2

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

Proceedings of the National Academy of Sciences of the United States of America
|July 9, 2014
PubMed
Summary
This summary is machine-generated.

Researchers developed a printed diode for the Internet-of-Things (IoT) that operates at 1.6 GHz, enabling wireless communication for printed electronics and electronic tags.

Keywords:
UHFsilicon particle

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Nanotechnology

Background:

  • Printed electronics are crucial for the Internet-of-Things (IoT) concept, enabling wireless electronic tags and sensors.
  • Current limitations in charge carrier mobility of printable semiconductors restrict the operational frequency of printed rectifiers, hindering direct communication and powering for printed devices.

Purpose of the Study:

  • To develop a high-frequency, all-printed diode for advanced Internet-of-Things (IoT) applications.
  • To overcome the limitations of existing printed rectifiers for enabling direct communication and powering between mobile devices and printed electronics.

Main Methods:

  • Fabrication of a novel printed diode using stacked layers of silicon (Si) and niobium silicide (NbSi2) particles on a flexible substrate.
  • Manufacturing the device at low temperature and in ambient atmosphere.
  • Characterization of the diode's electrical properties, including its operational frequency and rectification mechanism.

Main Results:

  • Demonstrated an all-printed diode with an operational frequency of up to 1.6 GHz.
  • Achieved charge injection-limited regime operation due to high charge carrier mobility of Si microparticles.
  • Observed rectification of tunneling current attributed to the asymmetry of oxide layers in the device stack.
  • Successfully integrated printed diodes with antennas and electrochromic displays to create a functional all-printed electronic tag (e-tag).
  • Showcased the e-tag's ability to update its display by harvesting signals from a Global System for Mobile Communications (GSM) mobile phone.

Conclusions:

  • The developed printed diode represents a significant advancement for printed electronics in IoT applications.
  • The high operational frequency and efficient rectification pave the way for new communication pathways in wireless electronic tags and sensors.
  • This technology enables direct communication and powering for printed electronics, enhancing their integration into the Internet-of-Things ecosystem.