Fabrication and Application of Optoelectronics Based on Nanomaterials

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D1: Semiconductor Devices".

Deadline for manuscript submissions: closed (31 January 2024) | Viewed by 169

Special Issue Editor

Dr. Arup Ghorai
E-Mail Website
Guest Editor
Department of Chemical and Biomolecular Engineering, NC State University, Raleigh, NC 27695, USA
Interests: synthesis; optoelectronic devices; perovskites; energy harvesting

Special Issue Information

Dear Colleagues,

Optoelectronics is currently experiencing a revolution thanks to the development of nanomaterials, which have opened up previously unimaginable possibilities for the creation and use of high-tech devices with superior performance. Since the intrinsic properties of nanomaterials are strongly related to their size, shape and surface properties, special attention is needed for their controlled synthesis. Quantum dots (QDs) are a commonly used nanomaterial in optoelectronics. Strong confinement effects and tunable optical and electrical properties make them suitable candidates for solar cells and LEDs, among other uses. Halide perovskite has recently become a “Hot Cake” for optoelectronics device-based research. Its special properties, like having a large carrier diffusion path length, tunable absorption and emission, make it a tough competitor for Si-based PV in terms of efficiency. Nanomaterials' unique properties, like their ability to emit and absorb light at particular wavelengths, also make them useful for biological sensing and imaging applications. By leveraging the unique properties of nanomaterials, researchers and engineers can develop devices with improved performance, energy efficiency and functionality, which will impact various aspects of our daily lives.

We look forward to your submissions!

Dr. Arup Ghorai
Guest Editor

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Keywords

  • nanomaterials
  • optoelectronics
  • quantum dots
  • synthesis
  • perovskites

Published Papers (1 paper)

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Research

11 pages, 3016 KiB  
Article
Enhancement of the Visible Light Photodetection of Inorganic Photodiodes via Additional Quantum Dots Layers
Micromachines 2024, 15(3), 318; https://doi.org/10.3390/mi15030318 (registering DOI) - 25 Feb 2024
Abstract
Visible light photodetectors are extensively researched with transparent metal oxide holes/electron layers for various applications. Among the metal oxide transporting layers, nickel oxide (NiO) and zinc oxide (ZnO) are commonly adopted due to their wide band gap and high transparency. The objective of [...] Read more.
Visible light photodetectors are extensively researched with transparent metal oxide holes/electron layers for various applications. Among the metal oxide transporting layers, nickel oxide (NiO) and zinc oxide (ZnO) are commonly adopted due to their wide band gap and high transparency. The objective of this study was to improve the visible light detection of NiO/ZnO photodiodes by introducing an additional quantum dot (QD) layer between the NiO and ZnO layers. Utilizing the unique property of QDs, we could select different sizes of QDs and responsive light wavelength ranges. The resulting red QDs utilized device that could detect light starting at 635 nm to UV (Ultra-violet) light wavelength and exhibited a photoresponsivity and external quantum efficiency (EQE) of 14.99 mA/W and 2.92% under 635 nm wavelength light illumination, respectively. Additionally, the green QDs, which utilized a device that could detect light starting at 520 nm, demonstrated photoresponsivity values of 8.34 mA/W and an EQE of 1.99% under 520 nm wavelength light illumination, respectively. In addition, we used X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) to investigate the origin of the photocurrents and the enhancement of the device’s performance. This study suggests that incorporating QDs with metal oxide semiconductors is an effective approach for detecting visible light wavelengths in transparent optoelectronic devices. Full article
(This article belongs to the Special Issue Fabrication and Application of Optoelectronics Based on Nanomaterials)
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