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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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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...
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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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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.
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A Schottky-Type Metal-Semiconductor-Metal Al0.24Ga0.76N UV Sensor Prepared by Using Selective Annealing.

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  • 1School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Korea.

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Selective annealing significantly improved aluminum gallium nitride (AlGaN) UV sensors. This technique reduced dark current and enhanced performance by optimizing metal-semiconductor contacts, crucial for sensitive UV detection.

Keywords:
UVUV-to-visible rejection ratio (UVRR)aluminum gallium nitride (AlGaN)local breakdown

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Area of Science:

  • Materials Science
  • Semiconductor Physics
  • Optoelectronics

Background:

  • Metal-semiconductor-metal (MSM) ultraviolet (UV) sensors are vital for various applications.
  • Achieving low dark current and stable ohmic contacts is critical for high-performance UV sensors.
  • Aluminum gallium nitride (AlGaN) is a promising material for UV sensing due to its tunable bandgap.

Purpose of the Study:

  • To investigate the effect of selective annealing on the performance of asymmetric AlGaN UV sensors.
  • To improve the ohmic behavior and reduce dark current density in AlGaN-based UV sensors.
  • To understand the microstructural and chemical changes induced by annealing.

Main Methods:

  • Fabrication of asymmetric AlGaN UV sensors with 24% Al content.
  • Application of a selective annealing technique to the fabricated sensors.
  • Characterization using transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS).
  • Electrical performance testing, including dark current density and UV-to-visible rejection ratio (UVRR) measurements.

Main Results:

  • Selective annealing dramatically reduced dark current density from 1.3 × 10-7 A/cm2 to 8.5 × 10-10 A/cm2 at -2.0 V.
  • The UV-to-visible rejection ratio (UVRR) improved significantly from 84 to 672 at -7.0 V after annealing.
  • TEM analysis revealed interdiffusion between metal layers, transforming Ti/Al/Ni/Au contacts from rectifying to ohmic.
  • XPS analysis showed a decrease in Ga oxide peak intensity, indicating reduced surface leakage pathways.

Conclusions:

  • Selective annealing is an effective method for enhancing the performance of AlGaN UV sensors.
  • The improved performance is attributed to the transition to ohmic contacts and reduced surface leakage.
  • Optimized AlGaN UV sensors demonstrate potential for advanced UV detection applications.