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Schottky Barrier Diode

Schottky Barrier Diode

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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Updated: Jan 13, 2026

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

Published on: May 31, 2018

Integrated PbTe Quantum Dots for Two-Color Detection in II-VI Wide-Bandgap Diodes.

Jakub M Głuch¹, Michał Szot^1,2, Grzegorz Karczewski¹

¹Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland.

Nanomaterials (Basel, Switzerland)

|January 9, 2026

Summary

This study integrates lead telluride quantum dots (PbTe QDs) into wide-bandgap semiconductor junctions, creating novel dual-wavelength photodetectors. These devices exhibit sensitivity to both infrared and visible light, paving the way for advanced imaging and solar energy applications.

Keywords:

infrared detectors photodiodes quantum dots two-color detectors

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Published on: September 12, 2014

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Published on: September 12, 2014

Area of Science:

Materials Science
Nanotechnology
Semiconductor Physics

Background:

Wide-bandgap p-n junctions are crucial for photodetector applications.
Narrow-bandgap quantum dots (QDs) offer tunable optical properties.
Integrating QDs into semiconductor heterostructures presents fabrication challenges.

Purpose of the Study:

To engineer PbTe QDs within the depletion region of ZnTe/CdTe p-n junctions.
To investigate the photodetector performance of these heterostructures.
To explore their potential for dual-wavelength detection.

Main Methods:

Heterostructures grown using molecular beam epitaxy (MBE) on GaAs substrates.
PbTe QDs formed via layer deposition and thermal annealing.
Characterization using scanning electron microscopy (SEM) and electron beam-induced current (EBIC).

Main Results:

PbTe layers transformed into zero-dimensional QDs within a CdTe matrix.
QDs localized in the depletion region confirmed by EBIC.
Dual-wavelength sensitivity observed: 1-4.5 μm (IR) and visible spectrum, with peak responsivities of 8 V/W at 2.0 μm (200 K) and 20 V/W at 0.69 μm.

Conclusions:

Engineered wide-bandgap p-n junctions with narrow-bandgap QDs function as effective dual-wavelength photodetectors.
The IR response is governed by band-to-band transitions in PbTe QDs.
Potential applications include two-color detection systems and infrared solar cells.