Submit to Special Issue Submit Abstract to Special Issue Review for Nanomaterials Propose a Special Issue

Journal Browser

Quantum Dot Materials and Optoelectronic Devices

Print Special Issue Flyer
Special Issue Editors
Special Issue Information
Keywords
Published Papers

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

Deadline for manuscript submissions: 20 June 2024 | Viewed by 8932

Share This Special Issue

Special Issue Editors

Prof. Dr. Yaohong Zhang

E-Mail Website
Guest Editor

School of Physics, Northwest University, Xi’an 710127, China
Interests: quantum dot solar cell; nanomaterials; perovskite solar cell; photocatalytic

Dr. Guohua Wu

E-Mail Website
Guest Editor

College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
Interests: quantum dot solar cells; perovskite solar cells; electrochromic device; organic and inorganic optical materials; charge dynamics

Special Issue Information

Dear Colleagues,

Quantum dots (QDs) have been attracting immense attention recently owing to their quantum-size effect bandgap tunability from the visible to infrared range, strong absorption with high molar extinction coefficient, and new phenomena such as multiple exciton generation (MEG) and low-cost solution processability. This makes QDs promising in various applications, for instance, field effect transistors (FETs), light emitting diodes (LEDs), photodetector, photocatalysts, and solar cells. The last Special Issue on QD materials and optoelectronic deivces was published several years ago, and there has been impressive new progress in the field since. Thus, it is time to highlight these new results so that we can be better prepared for future development. This Special Issue is focused on the synthesis and passivation of QD materials, and the new progress of QD-based optoelectronic devices such as solar cells, QD-LED, FETs, detectors and photocatalytic systems.

Prof. Dr. Yaohong Zhang
Dr. Guohua Wu
Guest Editors

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. Nanomaterials 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 2900 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
solar cells
light-emitting diode
photodetector
photocatalyst

Published Papers (6 papers)

Download All Papers

Research

Jump to: Review

11 pages, 2202 KiB

Open AccessArticle

Study of Laser-Induced Multi-Exciton Generation and Dynamics by Multi-Photon Absorption in CdSe Quantum Dots

by Peng Zhang, Yimeng Wang, Xueqiong Su, Qiwen Zhang and Mingyu Sun

Nanomaterials 2024, 14(7), 558; https://0-doi-org.brum.beds.ac.uk/10.3390/nano14070558 - 22 Mar 2024

Viewed by 574

Abstract

Multi-exciton generation by multi-photon absorption under low-energy photons can be thought a reasonable method to reduce the risk of optical damage, especially in photoelectric quantum dot (QD) devices. The lifetime of the multi-exciton state plays a key role in the utilization of photon-induced carriers, which depends on the dynamics of the exciton generation process in materials. In this paper, the exciton generation dynamics of the photon absorption under low-frequency light in CdSe QDs are successfully detected and studied by the temporal resolution transient absorption (TA) spectroscopy method. Since the cooling time of hot excitons extends while the rate of auger recombination is accelerated when incident energy is increased, the filling time of defect states is irregular, and exciton generation experiences a transition from single-photon absorption to multi-photon absorption. This result shows how to change the excitation. Optical parameters can prolong the lifetime of excitons, thus fully extracting excitons and improving the photoelectric conversion efficiency of QD optoelectronic devices, which provides theoretical and experimental support for the development of QD optoelectronic devices. Full article

(This article belongs to the Special Issue Quantum Dot Materials and Optoelectronic Devices)

► Show Figures

Figure 1

11 pages, 2803 KiB

Open AccessArticle

In-Depth Insight into the Effect of Hydrophilic-Hydrophobic Group Designing in Amidinium Salts for Perovskite Precursor Solution on Their Photovoltaic Performance

by Guohua Wu, Hua Li, Shuai Chen, Shengzhong (Frank) Liu, Yaohong Zhang and Dapeng Wang

Nanomaterials 2022, 12(21), 3881; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12213881 - 03 Nov 2022

Viewed by 1570

Abstract

Amidinium salts have been utilized in perovskite precursor solutions as additives to improve the quality of perovskite films. The design of hydrophilic or hydrophobic groups in amidinium salts is of great importance to photovoltaic device performance and stability in particular. Here we report a contrast study of a guanidinium iodide (GUI) additive with a hydrophilic NH₂ group, and a N,1–diiodoformamidine (DIFA) additive with a hydrophobic C–I group, to investigate the group effect. The addition of GUI or DIFA was beneficial to achieve high quality perovskite film and superior photovoltaic device performance. Compared with GUI, the addition of the DIFA in a perovskite precursor solution enhanced the crystal quality, reduced the defect density, and protected the water penetration into perovskite film. The perovskite solar cell (PSC) devices showed the best power conversion efficiency (PCE) of 21.19% for those modified with DIFA, as compared to 18.85% for the control, and 20.85% for those modified with GUI. In benefit to the hydrophobic C–I group, the DIFA–modified perovskite films and PSC exhibited the best light stability, thermal stability, and humidity stability in comparison to the control films and GUI–modified films. Overall, the introduction of a hydrophobic group in the amidinium salts additive was demonstrated to be an efficient approach to achieve high quality and stable perovskite film and PSC devices. Full article

(This article belongs to the Special Issue Quantum Dot Materials and Optoelectronic Devices)

► Show Figures

Figure 1

10 pages, 2971 KiB

Open AccessArticle

Optimizing the Synthetic Conditions of “Green” Colloidal AgBiS₂ Nanocrystals Using a Low-Cost Sulfur Source

by Qiao Li, Xiaosong Zheng, Xiaoyu Shen, Shuai Ding, Hongjian Feng, Guohua Wu and Yaohong Zhang

Nanomaterials 2022, 12(21), 3742; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12213742 - 25 Oct 2022

Cited by 7 | Viewed by 1714

Abstract

Colloidal AgBiS₂ nanocrystals (NCs) have attracted increasing attention as a near–infrared absorbent materials with non–toxic elements and a high absorption coefficient. In recent years, colloidal AgBiS₂ NCs have typically been synthesized via the hot injection method using hexamethyldisilathiane (TMS) as the sulfur source. However, the cost of TMS is one of the biggest obstacles to large–scale synthesis of colloidal AgBiS₂ NCs. Herein, we synthesized colloidal AgBiS₂ NCs using oleylamine@sulfur (OLA–S) solution as the sulfur source instead of TMS and optimized the synthesis conditions of colloidal AgBiS₂ NCs. By controlling the reaction injection temperature and the dosage of OLA–S, colloidal AgBiS₂ NCs with adjustable size can be synthesized. Compared with TMS–based colloidal AgBiS₂ NCs, the colloidal AgBiS₂ NCs based on OLA–S has good crystallinity and fewer defects. Full article

(This article belongs to the Special Issue Quantum Dot Materials and Optoelectronic Devices)

► Show Figures

Figure 1

10 pages, 4229 KiB

Open AccessArticle

Quantum Mechanical Analysis Based on Perturbation Theory of CdSe/ZnS Quantum-Dot Light-Emission Properties

by Honyeon Lee and Dongjin Kim

Nanomaterials 2022, 12(20), 3590; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12203590 - 13 Oct 2022

Cited by 1 | Viewed by 1074

Abstract

A simulation of quantum dot (QD) energy levels was designed to reproduce a quantum mechanical analytic method based on perturbation theory. A Schrödinger equation describing an electron–hole pair in a QD was solved, in consideration of the heterogeneity of the material parameters of the core and shell. The equation was solved numerically using single-particle basis sets to obtain the eigenstates and energies. This approach reproduced an analytic solution based on perturbation theory, while the calculation was performed using a numerical method. Owing to the effectiveness of the method, QD behavior according to the core diameter and external electric field intensity could be investigated reliably and easily. A 9.2 nm diameter CdSe/ZnS QD with a 4.2 nm diameter core and 2.5 nm thick shell emitted a 530 nm green light, according to an analysis of the effects of core diameter on energy levels. A 4 nm redshift at

5.4 \times 10^{5}

V/cm electric field intensity was found while investigating the effects of external electric field on energy levels. These values agree well with previously reported experimental results. In addition to the energy levels and light emission wavelengths, the spatial distributions of wavefunctions were obtained. This analysis method is widely applicable for studying QD characteristics with varying structure and material compositions and should aid the development of high-performance QD technologies. Full article

(This article belongs to the Special Issue Quantum Dot Materials and Optoelectronic Devices)

► Show Figures

Figure 1

13 pages, 684 KiB

Open AccessFeature PaperArticle

Optical Absorption on Electron Quantum-Confined States of Perovskite Quantum Dots

by Serhii I. Pokutnii and Andrzej Radosz

Nanomaterials 2022, 12(17), 2973; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12172973 - 28 Aug 2022

Viewed by 1118

Abstract

In the framework of the dipole approximation, it is shown that in the perovskites quantum dots (QDs)

{FAPbBr}_{3}

and {en}

{FAPbBr}_{3}

interacting with low-intensity light, the oscillator strengths of transitions, as well as the dipole moments allowing transitions [...] Read more.

In the framework of the dipole approximation, it is shown that in the perovskites quantum dots (QDs)

{FAPbBr}_{3}

and {en}

{FAPbBr}_{3}

interacting with low-intensity light, the oscillator strengths of transitions, as well as the dipole moments allowing transitions between one-particle electron quantum-confined states, attain values considerably (by two orders of magnitude) exceeding the typical values of the corresponding quantities in semiconductors. It has been established that the maximum values of the cross-section optical absorption of perovskite QDs are reached at the resonant frequencies of electron transitions. This makes it possible to use such nanosystems as of strong absorption nanomaterials in a wide range of infrared waves. Full article

(This article belongs to the Special Issue Quantum Dot Materials and Optoelectronic Devices)

► Show Figures

Figure 1

Review

Jump to: Research

18 pages, 3907 KiB

Open AccessReview

All–Inorganic Perovskite Quantum Dot–Based Blue Light–Emitting Diodes: Recent Advances and Strategies

by Yuyu Hu, Shijie Cao, Peng Qiu, Meina Yu and Huiyun Wei

Nanomaterials 2022, 12(24), 4372; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12244372 - 08 Dec 2022

Cited by 5 | Viewed by 2116

Abstract

Light–emitting diodes (LEDs) based on all–inorganic lead halide perovskite quantum dots (PQDs) have undergone rapid development especially in the past five years, and external quantum efficiencies (EQEs) of the corresponding green– and red–emitting devices have exceeded 23%. However, the blue–emitting devices are facing greater challenges than their counterparts, and their poor luminous efficiency has hindered the display application of PQD–based LEDs (PeQLEDs). This review focuses on the key challenges of blue–emitting PeQLEDs including low EQEs, short operating lifetime, and spectral instability, and discusses the essential mechanism by referring to the latest research. We then systematically summarize the development of preparation methods of blue emission PQDs, as well as the current strategies on alleviating the poor device performance involved in composition engineering, ligand engineering, surface/interface engineering, and device structural engineering. Ultimately, suggestions and outlooks are proposed around the major challenges and future research direction of blue PeQLEDs. Full article

(This article belongs to the Special Issue Quantum Dot Materials and Optoelectronic Devices)

► Show Figures