Quantum Dots & Quantum Wells

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

Deadline for manuscript submissions: closed (20 December 2020) | Viewed by 10090

Special Issue Editor


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Guest Editor
Applied Physics Department and Institute of Materials Science, University of Valencia, P.O. Box 22085, 46071 Valencia, Spain
Interests: optical properties; optical micro-spectroscopy; light-matter interaction; exciton recombination dynamics; low-dimensional semiconductors; quantum dots; quantum wells; 2D semiconductors; metal halide perovskites; nanomaterials; nanocrystals; metal nanoparticles; photonics; plasmonics; photodetectors
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Special Issue Information

Dear colleagues,

Quantum-size confinement in semiconductors leads to an increase of optical transition energies, but also important changes in other physical properties (such as oscillator strength, density of states, and transport) and new optical properties (such as single photon emission, and entangled photons). If the confinement is produced in one, two, or three dimensions, the low-dimensional semiconductors are known as quantum wells (QWs), wires (QWRs), and dots (QDs), respectively.

The first, QWs, have been studied for more than 40 years now, with very important applications in lasers. In recent years, after the discovery of graphene, the investigation of single- (2D) and few-layer (quasi-2D or QW) semiconductors obtained by exfoliation, as in the case of transition metal dichalcogenides, but also obtained by chemical synthesis (2D and 2D/3D perovskites, and nanoplatelets) and CVD-based growth, have widened the physics and application fields for QWs.

Similarly, from self-assembled QDs obtained by molecular beam epitaxy obtained at 1990’s to colloidal quantum dots popularized in the first decade of 2000s, a lot of physics and applications have been developed during the last 25 years. It is important to mention here the studies on quantum light based on QDs as “artificial atoms” and their coupling to microcavities, and the development of solar cells and LEDs based on colloidal QDs (II-VI and IV-VI as CdSe and PbS, respectively), a research line followed currently by using other nanocrystals, such as those based on metal halide perovskites.

This Special Issue will be focused on basic research (optical transitions and single-photon emission in single nanocrystals), and current and prospective applications of QWs and QDs in the fields of optical sensing, photonics (stimulated emission and lasing), and optoelectronics (photodetectors and solar cells, and LEDs).  

Prof. Dr. Juan P. Martínez Pastor
Guest Editor

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Published Papers (2 papers)

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22 pages, 8799 KiB  
Article
Modeling Quantum Dot Systems as Random Geometric Graphs with Probability Amplitude-Based Weighted Links
by Lucas Cuadra and José Carlos Nieto-Borge
Nanomaterials 2021, 11(2), 375; https://doi.org/10.3390/nano11020375 - 2 Feb 2021
Cited by 10 | Viewed by 2934
Abstract
This paper focuses on modeling a disorder ensemble of quantum dots (QDs) as a special kind of Random Geometric Graphs (RGG) with weighted links. We compute any link weight as the overlap integral (or electron probability amplitude) between the QDs (=nodes) involved. This [...] Read more.
This paper focuses on modeling a disorder ensemble of quantum dots (QDs) as a special kind of Random Geometric Graphs (RGG) with weighted links. We compute any link weight as the overlap integral (or electron probability amplitude) between the QDs (=nodes) involved. This naturally leads to a weighted adjacency matrix, a Laplacian matrix, and a time evolution operator that have meaning in Quantum Mechanics. The model prohibits the existence of long-range links (shortcuts) between distant nodes because the electron cannot tunnel between two QDs that are too far away in the array. The spatial network generated by the proposed model captures inner properties of the QD system, which cannot be deduced from the simple interactions of their isolated components. It predicts the system quantum state, its time evolution, and the emergence of quantum transport when the network becomes connected. Full article
(This article belongs to the Special Issue Quantum Dots & Quantum Wells)
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17 pages, 3860 KiB  
Article
Ligand-Length Modification in CsPbBr3 Perovskite Nanocrystals and Bilayers with PbS Quantum Dots for Improved Photodetection Performance
by Juan Navarro Arenas, Ananthakumar Soosaimanickam, Hamid Pashaei Adl, Rafael Abargues, Pablo P. Boix, Pedro J. Rodríguez-Cantó and Juan P. Martínez-Pastor
Nanomaterials 2020, 10(7), 1297; https://doi.org/10.3390/nano10071297 - 2 Jul 2020
Cited by 22 | Viewed by 6388
Abstract
Nanocrystals surface chemistry engineering offers a direct approach to tune charge carrier dynamics in nanocrystals-based photodetectors. For this purpose, we have investigated the effects of altering the surface chemistry of thin films of CsPbBr3 perovskite nanocrystals produced by the doctor blading technique, [...] Read more.
Nanocrystals surface chemistry engineering offers a direct approach to tune charge carrier dynamics in nanocrystals-based photodetectors. For this purpose, we have investigated the effects of altering the surface chemistry of thin films of CsPbBr3 perovskite nanocrystals produced by the doctor blading technique, via solid state ligand-exchange using 3-mercaptopropionic acid (MPA). The electrical and electro-optical properties of photovoltaic and photoconductor devices were improved after the MPA ligand exchange, mainly because of a mobility increase up to 5 × 10−3 cm 2 / Vs . The same technology was developed to build a tandem photovoltaic device based on a bilayer of PbS quantum dots (QDs) and CsPbBr3 perovskite nanocrystals. Here, the ligand exchange was successfully carried out in a single step after the deposition of these two layers. The photodetector device showed responsivities around 40 and 20 mA/W at visible and near infrared wavelengths, respectively. This strategy can be of interest for future visible-NIR cameras, optical sensors, or receivers in photonic devices for future Internet-of-Things technology. Full article
(This article belongs to the Special Issue Quantum Dots & Quantum Wells)
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