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

Deadline for manuscript submissions: closed (30 July 2023) | Viewed by 5116

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Dr. Weichang Zhou

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Guest Editor

School of Physics and Electronics, Hunan Normal University, Changsha, China
Interests: nanomaterials synthesis; nanophotonics; nanomaterials-based spectroscopy; optoelectronics; device physics

Special Issue Information

Dear Colleagues,

Recently, nanomaterials, including zero-dimensional (0D) quantum dots, one-dimensional (1D) nanowires, and two-dimensional (2D) thin flakes, have attracted worldwide attention due to their fascinating properties and potential applications. Materials such as various oxides, sulfides, nitrides, halides, and semiconductor nanostructures have been synthesized and used in the fabrication of photonic and optoelectronic devices (for example, lasers, light-emitting diodes, photo-detectors, photo-transistor, photo-modulators, solar cells, etc.). However, several major problems of defects, stability, interface engineering, and chip integration are slowing down the development of these nanoscaled photonic and optoelectronic devices. This field requires more focus to promote commercial applications.

The present Special Issue will focus on comprehensive research outlining progress on the synthesis and application of nanomaterials in photonic and optoelectronic devices. In this Special Issue, we aim to publish original research articles and review articles involving nanomaterial synthesis, nanophotonics, and optoelectronic nanodevices. Potential topics include, but are not limited to:

Synthesis of various low-dimensional nanomaterials;
Advanced characterization techniques using for nanomaterials;
Nanomaterials-based spectroscopy;
Nanophotonics;
Optoelectronics nanodevices;
Devices’ physics modeling;
Simulation and calculation of nanomaterials.

Dr. Weichang Zhou
Guest Editor

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Keywords

Low-dimensional nanomaterials
Nanomaterials characterization
Spectroscopy
Emission mechanism
Optical microcavity
Nonlinear optics
Nanophotonics
Optoelectronics nanodevices

Published Papers (4 papers)

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Research

15 pages, 16131 KiB

Open AccessArticle

Green Synthesis and Morphological Evolution for Bi₂Te₃ Nanosystems via a PVP-Assisted Hydrothermal Method

by Fang Zhou, Weichang Zhou, Yujing Zhao and Li Liu

Nanomaterials 2023, 13(21), 2894; https://doi.org/10.3390/nano13212894 - 01 Nov 2023

Viewed by 1031

Abstract

_{2}

_{3}

has been extensively used because of its excellent thermoelectric properties at room temperature. Here, 230–420 nm of Bi

_{2}

_{3}

hexagonal nanosheets has been successfully synthesized via a “green” method by using ethylene glycol solution and applying polyvinyl [...] Read more.

_{2}

_{3}

has been extensively used because of its excellent thermoelectric properties at room temperature. Here, 230–420 nm of Bi

_{2}

_{3}

hexagonal nanosheets has been successfully synthesized via a “green” method by using ethylene glycol solution and applying polyvinyl pyrrolidone (PVP) as a surfactant. In addition, factors influencing morphological evolution are discussed in detail in this study. Among these parameters, the reaction temperature, molar mass of NaOH, different surfactants, and reaction duration are considered as the most essential. The results show that the existence of PVP is vital to the formation of a plate-like morphology. The reaction temperature and alkaline surroundings played essential roles in the formation of Bi

_{2}

_{3}

single crystals. By spark plasma sintering, the Bi

_{2}

_{3}

hexagonal nanosheets were hot pressed into solid-state samples. We also studied the transport properties of solid-state samples. The electrical conductivity

σ

was 18.5 × 10

^{3}

^{- 1}

to 28.69 × 10

^{3}

^{- 1}

, and the Seebeck coefficient S was −90.4 to −113.3 µVK

^{- 1}

over a temperature range of 300–550 K. In conclusion, the observation above could serve as a catalyst for future exploration into photocatalysis, solar cells, nonlinear optics, thermoelectric generators, and ultraviolet selective photodetectors of Bi

_{2}

_{3}

nanosheet-based photodetectors. Full article

(This article belongs to the Special Issue Nanomaterial-Based Nano-Electronic and Photonic Devices)

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11 pages, 3433 KiB

Open AccessArticle

Low-Voltage Solution-Processed Zinc-Doped CuI Thin Film Transistors with NOR Logic and Artificial Synaptic Function

by Xiaomin Gan, Wei Dou, Wei Hou, Xing Yuan, Liuhui Lei, Yulan Zhou, Jia Yang, Diandian Chen, Weichang Zhou and Dongsheng Tang

Nanomaterials 2023, 13(16), 2345; https://doi.org/10.3390/nano13162345 - 15 Aug 2023

Cited by 1 | Viewed by 1035

Abstract

Low-voltage Zn-doped CuI thin film transistors (TFTs) gated by chitosan dielectric were fabricated at a low temperature. The Zn-doped CuI TFT exhibited a more superior on/off current ratio than CuI TFT due to the substitution or supplementation of copper vacancies by Zn ions. The Zn-doped CuI films were characterized by scanning electron microscope, X-ray diffraction, and X-ray photoelectron spectroscopy. The Zn-doped CuI TFTs exhibited an on/off current ratio of 1.58 × 10⁴, a subthreshold swing of 70 mV/decade, and a field effect mobility of 0.40 cm²V⁻¹s⁻¹, demonstrating good operational stability. Due to the electric-double-layer (EDL) effect and high specific capacitance (17.3 μF/cm²) of chitosan gate dielectric, Zn-doped CuI TFT operates at a voltage below −2 V. The threshold voltage is −0.2 V. In particular, we have prepared Zn-doped CuI TFTs with two in-plane gates and NOR logic operation is implemented on such TFTs. In addition, using the ion relaxation effect and EDL effect of chitosan film, a simple pain neuron simulation is realized on such a p-type TFTs for the first time through the bottom gate to regulate the carrier transport of the channel. This p-type device has promising applications in low-cost electronic devices, complementary electronic circuit, and biosensors. Full article

(This article belongs to the Special Issue Nanomaterial-Based Nano-Electronic and Photonic Devices)

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11 pages, 2307 KiB

Open AccessArticle

Research on the High Light Out-Coupling Efficiency Deep-Blue Top-Emitting Organic Light-Emitting Diode through FDTD Optical Simulation

by Saihu Pan, Suhao Hu and Bin Wei

Nanomaterials 2023, 13(7), 1282; https://doi.org/10.3390/nano13071282 - 05 Apr 2023

Viewed by 1493

Abstract

We have studied high light out-coupling efficiency top-emitting organic light-emitting diodes (TOLEDs) under the guidance of the finite-difference time-domain (FDTD) simulation. TOLED achieves an extraordinarily high light extraction efficiency at 468 nm, in deep-blue regions, of 49.70%, which is approximately 3.5 times that of the bottom light-emitting diode (BOLED) by changing the thickness of the organic layer and the position of the light-emitting layer in the FDTD simulation. Based on the simulation results, the TOLED with ultrahigh efficiency and narrow full width at half maximum is successfully fabricated, and the maximum external quantum efficiency of TOLED is almost 3.3 times that of the BOLED, which is perfectly consistent with the FDTD simulation results. Meanwhile, the shift of the electroluminescence spectrum of the TOLED is restricted within 10° in the angular-dependence test (0° to 80°). The optimized performance of the OLED indicates a new method to develop a high-performance device under the guidance of simulation. Full article

(This article belongs to the Special Issue Nanomaterial-Based Nano-Electronic and Photonic Devices)

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9 pages, 2613 KiB

Open AccessArticle

Competition of Photo-Excitation and Photo-Desorption Induced Positive and Negative Photoconductivity Switch in Te Nanowires

by Yanling Yin, Jing Ling, Liushun Wang, Weichang Zhou, Yuehua Peng, Yulan Zhou and Dongsheng Tang

Nanomaterials 2022, 12(21), 3747; https://doi.org/10.3390/nano12213747 - 25 Oct 2022

Cited by 2 | Viewed by 1144

Abstract

The photocurrent in tellurium nanowire (Te NW) exhibits a subtle influence by many extrinsic factors. Herein, we fabricate Te NW devices and explore their photoresponse properties in detail. It is observed that the current increases greatly at low environmental relative humidity (RH) under light illumination, demonstrating an evident positive photoconductivity (PPC). However, the photocurrent reduces at high RH, yielding a typical negative photoconductivity (NPC). In addition, when exposed to a proper relative humidity, Te NW devices show PPC immediately and then transfer to NPC gradually under illumination, exhibiting the RH sensitive PPC/NPC switch. It is proposed that the competition between photo-excitation and photo-desorption is responsible for this subtle switch of PPC/NPC. On the one hand, the adsorbed water molecules on the surface of Te nanowires, acting as electron acceptors, lead to an increase of conductance, exhibiting the PPC phenomenon. On the other hand, the photo-desorption of water molecules from the surface results in a decreased carrier concentration in the Te nanowires, yielding the NPC phenomenon. The in-depth understanding of such charge transfer processes between the absorbed water molecules and Te nanowires provides an effective route to modulate the carrier densities and control the PPC/NPC switch, which will accelerate the design and application of novel optoelectronic nanodevices. Full article

(This article belongs to the Special Issue Nanomaterial-Based Nano-Electronic and Photonic Devices)

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