Special Issue "Nanomaterial-Based Innovative Solutions for Optoelectronic Device Manufacturing"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanoelectronics, Nanosensors and Devices".

Deadline for manuscript submissions: closed (31 March 2021).

Special Issue Editor

Prof. Dr. Frank Shi
E-Mail Website
Guest Editor
The Henry Samueli School of Engineering, University of California, Irvine, CA 92697-2575, USA
Interests: innovative materials & processes for optoelectronic devices and manufacturing; CMP; nano-contacts and nano-interconnects; interphase design for functional nanocomposites; optically transparent antibacterial materials; nanoparticls and nanophosphors for imaging, detection and therapy; nanomaterial and special LED-enabled phototherapy devices for vision damage & macular degeneration, skin disorders, and jaundice; vision & skin-hazard free displays enabled by special nanomaterials and light sources
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Special Issue Information

Dear Colleagues,

Recent advances in exploring nanomaterial-based innovative and cost-effective solutions for optoelectronic device manufacturing will be devoted to by the present special issue. Contributions as an original research article or comprehensive review on the following specific topics, but not limited to, are particularly welcome.

  1. Innovative optical imaging based on nanomaterials
  2. Nanophosphors of narrow bandwidth emission and high stability, both up-conversion and down-conversion, for Mini-LEDs, Micro-LEDs, broadband and full-spectrum solar cells, and medical imaging & detection
  3. Cost effective nanomaterial enabled solutions for nanophosphor wavelength conversion structures; for hot spot elimination and for power reduction; and for optical performance enhancement in LED, OLED and mini-LED based displays & solid state lighting
  4. Nanomaterial based die attachment potential solutions for power optoelectronic packaging
  5. Nanomaterial enabled highly precision die attachment solutions for micro/mini LEDs, CMOS sensors, cameras, LiDARs
  6. Nano conductive pastes and inks for printable optoelectronic medical wearables and 5G devices

Please kindly note: The deadline is just for submission. When you have your manuscripts ready, you can submit them to the special issue right now, we will immediately proceed peer-review, then published the papers without any delay if the decision of peer-review is acceptance.

Accepted papers are published in the joint Special Issue in Nanomaterials or Nanomanufacturing (https://0-www-mdpi-com.brum.beds.ac.uk/journal/nanomanufacturing/special_issues/optoelectron_nano).

Prof. Frank Shi
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Nanomaterials
  • Nanophosphors
  • Wavelength conversion structures
  • Die attachment
  • Optoelectronic device manufacturing

Published Papers (6 papers)

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Research

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Article
A High-Sensitivity Flexible Direct X-ray Detector Based on Bi2O3/PDMS Nanocomposite Thin Film
Nanomaterials 2021, 11(7), 1832; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11071832 - 14 Jul 2021
Viewed by 567
Abstract
The characteristics of mechanical flexibility, low health risk, and simple processing of polymer nanocomposite materials make them potentially applicable as flexible X-ray detectors. In this study, we report on a high sensitivity, environmentally friendly, and flexible direct X-ray detector using polymer nanocomposite material [...] Read more.
The characteristics of mechanical flexibility, low health risk, and simple processing of polymer nanocomposite materials make them potentially applicable as flexible X-ray detectors. In this study, we report on a high sensitivity, environmentally friendly, and flexible direct X-ray detector using polymer nanocomposite material consisting of bismuth oxide (Bi2O3) nanoparticles and polydimethylsiloxane (PDMS). This detector was realized by printing patterned Ag electrodes on the polymer nanocomposite material. The response of PDMS to X-rays was verified for the first time, and the effect of doping different contents of Bi2O3 nanoparticles on the performance of the device was tested. The optoelectronic performance of the optimized detector indicated a high sensitivity (203.58 μC Gyair−1 cm−2) to low dose rate (23.90 μGyair s−1) at a 150 V bias voltage and the X-ray current density (JX-ray) was 10,000-fold higher than the dark current density (Jdark). The flexible direct X-ray detector could be curled for 10,000 cycles with slight performance degradation. The device exhibited outstanding stability after storage for over one month in air. Finally, this device provides new guidance for the design of high-performance flexible direct X-ray detectors. Full article
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Article
Effect of De-Twinning on Tensile Strength of Nano-Twinned Cu Films
Nanomaterials 2021, 11(7), 1630; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11071630 - 22 Jun 2021
Viewed by 577
Abstract
Tensile tests were carried on the electroplated Cu films with various densities of twin grain boundary. With TEM images and a selected area diffraction pattern, nano-twinned structure can be observed and defined in the electroplated Cu films. The density of the nano-twin grain [...] Read more.
Tensile tests were carried on the electroplated Cu films with various densities of twin grain boundary. With TEM images and a selected area diffraction pattern, nano-twinned structure can be observed and defined in the electroplated Cu films. The density of the nano-twin grain structure can be manipulated with the concentration of gelatin in the Cu-sulfate electrolyte solution. We found that the strength of the Cu films is highly related to the twin-boundary density. The Cu film with a greater twin-boundary density has a larger fracture strength than the Cu film with a lesser twin-boundary density. After tensile tests, necking phenomenon (about 20 μm) occurred in the fractured Cu films. Moreover, by focused ion beam (FIB) cross-sectional analysis, the de-twinning can be observed in the region where necking begins. Thus, we believe that the de-twinning of the nano-twinned structure initiates the plastic deformation of the nano-twinned Cu films. Furthermore, with the analysis of the TEM images on the nano-twinned structure in the necking region of the fractured Cu films, the de-twinning mechanism attributes to two processes: (1) the ledge formation by the engagement of the dislocations with the twin boundaries and (2) the collapse of the ledges with the opposite twin-boundaries. In conclusion, the plastic deformation of nano-twinned Cu films is governed by the de-twinning of the nano-twinned structure. Moreover, the fracture strength of the nano-twinned Cu films is proportional to the twin-boundaries density. Full article
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Article
Enhancement of Luminescence Efficiency of Y2O3 Nanophosphor via Core/Shell Structure
Nanomaterials 2021, 11(6), 1563; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11061563 - 14 Jun 2021
Viewed by 718
Abstract
We successfully fabricated Y2O3:RE3+ (RE = Eu, Tb, and Dy) core and core–shell nanophosphors by the molten salt method and sol–gel processes with Y2O3 core size of the order of 100~150 nm. The structural and [...] Read more.
We successfully fabricated Y2O3:RE3+ (RE = Eu, Tb, and Dy) core and core–shell nanophosphors by the molten salt method and sol–gel processes with Y2O3 core size of the order of 100~150 nm. The structural and morphological studies of the RE3+-doped Y2O3 nanophosphors are analyzed by using XRD, SEM and TEM techniques, respectively. The concentration and annealing temperature dependent structural and luminescence characteristics were studied for Y2O3:RE3+ core and core–shell nanophosphors. It is observed that the XRD peaks became narrower as annealing temperature increased in the core–shell nanophosphor. This indicates that annealing at higher temperature improves the crystallinity which in turn enhances the average crystallite size. The emission intensity and quantum yield of the Eu3+-doped Y2O3 core and core–shell nanoparticles increased significantly when annealing temperature is varied from 450 to 550 °C. No considerable variation was noticed in the case of Y2O3:Tb3+ and Y2O3:Dy3+ core and core–shell nanophosphors. Full article
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Review

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Review
Carrier Blocking Layer Materials and Application in Organic Photodetectors
Nanomaterials 2021, 11(6), 1404; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11061404 - 26 May 2021
Cited by 1 | Viewed by 1020
Abstract
As a promising candidate for next-generation photodetectors, organic photodetectors (OPDs) have gained increasing interest as they offer cost-effective fabrication methods using solution processes and a tunable spectral response range, making them particularly attractive for large area image sensors on lightweight flexible substrates. Carrier [...] Read more.
As a promising candidate for next-generation photodetectors, organic photodetectors (OPDs) have gained increasing interest as they offer cost-effective fabrication methods using solution processes and a tunable spectral response range, making them particularly attractive for large area image sensors on lightweight flexible substrates. Carrier blocking layers engineering is very important to the high performance of OPDs that can select a certain charge carriers (holes or electrons) to be collected and suppress another carrier. Carrier blocking layers of OPDs play a critical role in reducing dark current, boosting their efficiency and long-time stability. This Review summarizes various materials for carrier blocking layers and some of the latest progress in OPDs. This provides the reader with guidelines to improve the OPD performance via carrier blocking layers engineering. Full article
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Review
Layer-Scale and Chip-Scale Transfer Techniques for Functional Devices and Systems: A Review
Nanomaterials 2021, 11(4), 842; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11040842 - 25 Mar 2021
Cited by 1 | Viewed by 1012
Abstract
Hetero-integration of functional semiconductor layers and devices has received strong research interest from both academia and industry. While conventional techniques such as pick-and-place and wafer bonding can partially address this challenge, a variety of new layer transfer and chip-scale transfer technologies have been [...] Read more.
Hetero-integration of functional semiconductor layers and devices has received strong research interest from both academia and industry. While conventional techniques such as pick-and-place and wafer bonding can partially address this challenge, a variety of new layer transfer and chip-scale transfer technologies have been developed. In this review, we summarize such transfer techniques for heterogeneous integration of ultrathin semiconductor layers or chips to a receiving substrate for many applications, such as microdisplays and flexible electronics. We showed that a wide range of materials, devices, and systems with expanded functionalities and improved performance can be demonstrated by using these technologies. Finally, we give a detailed analysis of the advantages and disadvantages of these techniques, and discuss the future research directions of layer transfer and chip transfer techniques. Full article
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Review
Carbon-Based Quantum Dots for Supercapacitors: Recent Advances and Future Challenges
Nanomaterials 2021, 11(1), 91; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11010091 - 03 Jan 2021
Cited by 11 | Viewed by 2108
Abstract
Carbon-based Quantum dots (C-QDs) are carbon-based materials that experience the quantum confinement effect, which results in superior optoelectronic properties. In recent years, C-QDs have attracted attention significantly and have shown great application potential as a high-performance supercapacitor device. C-QDs (either as a bare [...] Read more.
Carbon-based Quantum dots (C-QDs) are carbon-based materials that experience the quantum confinement effect, which results in superior optoelectronic properties. In recent years, C-QDs have attracted attention significantly and have shown great application potential as a high-performance supercapacitor device. C-QDs (either as a bare electrode or composite) give a new way to boost supercapacitor performances in higher specific capacitance, high energy density, and good durability. This review comprehensively summarizes the up-to-date progress in C-QD applications either in a bare condition or as a composite with other materials for supercapacitors. The current state of the three distinct C-QD families used for supercapacitors including carbon quantum dots, carbon dots, and graphene quantum dots is highlighted. Two main properties of C-QDs (structural and electrical properties) are presented and analyzed, with a focus on the contribution to supercapacitor performances. Finally, we discuss and outline the remaining major challenges and future perspectives for this growing field with the hope of stimulating further research progress. Full article
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