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Applied Sciences
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Quantum Materials
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Quantum Materials

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (30 April 2018) | Viewed by 9720

Special Issue Editor

Prof. Dr. Shuichi Emura

E-Mail Website
Guest Editor
The Institute of Scientific and Industrial Research, Osaka University, Mihgaoka 8-1, Osaka 567-0047, Japan
Interests: spintronics devices; luminescence in quantum systems; defects (vacancies); diluted magnetic semiconductors (DMS); strongly correlated electron system

Special Issue Information

Dear Colleagues,

Quantum effects appear in various research fields in condensed matter physics and chemistry, and the applications in practical devices are widely expanding, with advance in the art of the fine nano-manufacturing techniques. In modern science, or in generating highly technological electronic devices, the exploitation of quantum phenomena cannot be avoided. Quantum computers need coherent control of the quantum materials. The luminescence from quantum materials, such as dots, nano-wires, and nano-particles, brings high efficiency. In the field of strongly correlated electron systems, new progress is reported daily. In this field, research fields relating quantum materials will grow quickly and widely. Such situations in quantum materials require summarized reports at suitable times. Our present lives are owed to devices involving quantum phenomena; this will be even more true in the near future.

This Special Issue of Applied Science, “Quantum Materials”, shines a spotlight on modern developments relating to quantum phenomena, and aims to cover recent advances in the exploitation of quantum phenomena, and, further, to address new activities in the fields of physics, chemistry, and biology, as well as in relevant application fields.

Prof. Dr. Shuichi Emura
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 submissions that pass pre-check are 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. Applied Sciences is an international peer-reviewed open access semimonthly 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 2400 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

  • Quantum dot

  • Nano-wires

  • 2D systems

  • Nano-particles

  • Quantum bit

  • Graphene

  • Quantum confined-effect

  • Spin

  • Spintronics

  • Strongly correlated system

  • Photoluminescence

Published Papers (2 papers)

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Research

7 pages, 19979 KiB  
Article
Stability of Two-Dimensional Polymorphs for 10,12-Pentacosadyn-1-ol on Graphite Investigated by SPM
by Daisuke Takajo and Koichi Sudoh
Appl. Sci. 2018, 8(4), 503; https://doi.org/10.3390/app8040503 - 27 Mar 2018
Cited by 1 | Viewed by 2774
Abstract
For monomolecular layers of 10,12-pentacosadiyn-1-ol on graphite, it is known that two different two-dimensional polymorphic forms—herringbone (H) and parallel (P) arrangements—are observable at room temperature. Here, we study the thermodynamic stability of these polymorphs by scanning tunneling microscopy (STM) and atomic force microscopy. [...] Read more.
For monomolecular layers of 10,12-pentacosadiyn-1-ol on graphite, it is known that two different two-dimensional polymorphic forms—herringbone (H) and parallel (P) arrangements—are observable at room temperature. Here, we study the thermodynamic stability of these polymorphs by scanning tunneling microscopy (STM) and atomic force microscopy. When the monomolecular films, where H and P domains coexist, are annealed at above 40 °C, the area of P arrangement irreversibly increases, demonstrating that P arrangement is thermodynamically stable while H arrangement is quasi-stable. Consistently, invasion of P domains into H domains is observed during morphological changes induced by STM scanning at room temperature. Furthermore, we estimate that the melting point of the monomolecular film of P arrangement is about 80 °C, which is 20 °C higher than that of the bulk crystal. Full article
(This article belongs to the Special Issue Quantum Materials)
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5118 KiB  
Communication
Solution-Processed Environmentally Friendly Ag2S Colloidal Quantum Dot Solar Cells with Broad Spectral Absorption
by Viktor A. Öberg, Xiaoliang Zhang, Malin B. Johansson and Erik M. J. Johansson
Appl. Sci. 2017, 7(10), 1020; https://doi.org/10.3390/app7101020 - 03 Oct 2017
Cited by 12 | Viewed by 6435
Abstract
A facile heat-up synthesis route is used to synthesize environmentally friendly Ag2S colloidal quantum dots (CQDs) that are applied as light absorbing material in solid state p-i-n junction solar cell devices. The as-synthesized Ag2S CQDs have an average size [...] Read more.
A facile heat-up synthesis route is used to synthesize environmentally friendly Ag2S colloidal quantum dots (CQDs) that are applied as light absorbing material in solid state p-i-n junction solar cell devices. The as-synthesized Ag2S CQDs have an average size of around 3.5 nm and exhibit broad light absorption covering ultraviolet, visible, and near infrared wavelength regions. The solar cell devices are constructed with a device architecture of FTO/TiO2/Ag2S CQDs/hole transport material (HTM) /Au using a solution-processed approach. Different HTMs, N2,N2,N2′,N2′,N7,N7,N7′,N7′-octakis(4-methoxyphenyl)-9,9′-spirobi(9H-fluorene)-2,2′,7,7′ tetramine (spiro-OMeTAD), poly(3-hexylthiophene-2,5-diyl) (P3HT), and poly((2,3-bis(3-octyloxyphenyl)-5,8-quinoxalinediyl)-2,5-thiophenediyl) TQ1 are studied for maximizing the device photovoltaic performance. The solar cell device with P3HT as a hole transport material gives the highest performance and the solar cell exhibit broad spectral absorption. These results indicate that Ag2S CQD have high potential for utilization as environmentally friendly light absorbing materials for solar cell application and that the hole transport material is critical to maximize the solar cell photovoltaic performance. Full article
(This article belongs to the Special Issue Quantum Materials)
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