Article
Materials Science, Multidisciplinary
S. Ktifa, M. Rahmani
Summary: This work investigates the morphology and optical properties of vanadium pentoxide (V2O5) nanoparticles deposited on silicon nanowires (SiNWs). SiNWs are obtained by metal-assisted chemical etching (MACE) method. The deposition of V2O5 on SiNWs is done using a vacuum thermal evaporation system for different durations. Snowball-like V2O5 nanoparticles are observed on the SiNWs surface, with increased condensation of V2O5 elements over longer evaporation durations. Raman and Fourier transform infrared (FTIR) spectroscopies analyze the changes in bonds and chemical composition of the SiNWs-V2O5 nanocomposites. X-ray Diffraction (XRD) technique confirms the orthorhombic structure of the V2O5 layer. SiNWs-V2O5 composites exhibit strong emission in the visible range due to radiative band edge transitions of V2O5, leading to an increased photoluminescence (PL) intensity similar to that of SiNWs. The optical band gap (Eog) increases from 1.851 to 2.075 eV with the presence of V2O5 on the SiNWs surface, attributed to the Burstein-Moss effect.
Article
Nanoscience & Nanotechnology
Alina Valimukhametova, Conor Ryan, Thomas Paz, Fabian Grote, Anton Naumov
Summary: Graphene oxide (GO) is a promising nanomaterial for optoelectronic applications due to its fluorescence and beneficial physical properties. While other graphene derivatives are possible, GO remains the most heavily used. This study explores different graphene derivatives and their optical properties, proposing a unified model for optical emission. The research suggests that graphene derivatives have minimal dependence on functional groups for their optical properties, indicating potential for use in research and industry.
Article
Chemistry, Multidisciplinary
Dongchun Zheng, Xiao-Li Zhao, Xueqi Yan, Weimin Xuan, Qi Zheng, Lianjun Wang, Wan Jiang
Summary: A family of transition-metal doped Ti-oxo clusters with diverse core structures have been successfully synthesized. Their photocurrent responses can be tuned by varying the heterometals, and the cobalt-doped cluster exhibits the highest H-2 evolution activity (32.5 mu mol g(-1) h(-1)) with good stability.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Ummer Altaf, Mohd Zubair Ansari, Seemin Rubab
Summary: The synthesis of Sn1-xAlxO2 (x = 0.0, 0.01, 0.02, 0.03, 0.04) nanoparticles by the sol-gel method and their characterization using various techniques revealed that increasing the aluminium content led to a decrease in the crystallite size and optical band gap. Photoluminance measurements showed violet emissions for all samples, with the 3% doped sample exhibiting the lowest intensity, indicating its potential for applications in photocatalysis and lithium-ion batteries. Additionally, 3% aluminium doping was found to be the optimum concentration for tin oxide samples in photocatalytic applications.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Smruti Medha Mishra, Suman Dey, Tukai Singha, Subhankar Mandal, Asish K. Dehury, Yatendra S. Chaudhary, Biswarup Satpati
Summary: In this study, a silicon nanowire-carbon quantum dot heterostructure photovoltaic device was developed by directly coating carbon quantum dots on chemically-etched silicon nanowire arrays. The efficiency of the solar cells was improved by using carbon quantum dots as a surface passivation and modification element for the silicon nanowires. A 1.6 times absorption enhancement was observed for the nitrogen doped carbon quantum dot decorated pyramidal silicon nanowire heterostructure compared to carbon quantum dots coated silicon nanowires on planar surfaces. The inclusion of nitrogen doped carbon quantum dots into the pyramidal silicon nanowire arrays provided enhanced absorption intensity, making them a good absorber layer in solar cells. The heterostructure also exhibited significant photoluminescence in the blue region, allowing insight into the recombination mechanism.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Chemistry, Inorganic & Nuclear
Maria S. Tarasenko, Alexander S. Kiryakov, Alexey A. Ryadun, Natalia V. Kuratieva, Victoria V. Malyutina-Bronskaya, Vladimir E. Fedorov, Hsiang-Chen Wang, Nikolay G. Naumov
Summary: This work presents a study on the synthesis and properties of gadolinium oxyselenide as a new phosphor material. The compound's crystal structure, stability, and behavior at different temperatures are discussed.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Chemistry, Physical
Mohamed A. Helal, H. M. El-Sayed, Ahmed A. Maarouf, Mohamed M. Fadlallah
Summary: The study investigated the impact of different pore structures on 2D-TMD using density functional theory, revealing higher stability for smaller pores, lattice deformation and decreased Young's modulus with increasing pore size. Certain systems exhibited magnetism due to missing metal atoms, while the emergence of metal states at pore edges resulted in some systems being half-metallic. Oxygen passivation restored metallic behavior in the systems.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Yubin Kang, Haolin Li, Jilong Tang, Huimin Jia, Xiaobing Hou, Xiang Li, Xueying Chu, Kexue Li, Fengyuan Lin, Xiaohua Wang, Zhipeng Wei
Summary: Crystal-phase control and crystalline quality improvement of GaAs nanowires have been achieved through dopant (Be) incorporation. XRD spectra combined with HRTEM demonstrate the improvement of crystalline quality, while Raman spectra combined with HRTEM clearly reveal the crystal-phase control under the effect of Be doping. Photoluminescence shows the transformation of emission peaks from undoped GaAs nanowires to Be-doped GaAs nanowires.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Chemistry, Inorganic & Nuclear
Wen-Tong Chen
Summary: A novel europium(III) complex, synthesized via a solvothermal reaction, exhibits a complex molecular structure with red photoluminescence emission properties. It has potential optical applications due to its unique characteristics.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Chemistry, Physical
Khushboo Punia, Ganesh Lal, Saurabh Dalela, Satya Narain Dolia, Parvez Ahmad Alvi, Shiv K. Barbar, Kunal B. Modi, Sudhish Kumar
Summary: The study reveals the impact of Gd substitution on the structural, optical, photoluminescence, and magnetic properties of Zn1-xGdxO nanocrystals, including crystallinity, band gap energy, emission characteristics, and magnetization behavior. Gd substitution results in a reduction in the average crystallite size of Zn1-xGdxO nanocrystals and confirms the coexistence of paramagnetic and weak ferromagnetic ordering in the presence of Gd.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Xiangmin Xie, Zhe'an Su, Dong Huang, Cheng Yang, Yafeng Wang, Kejian He, Qizhong Huang
Summary: The study found that SiC nanowires preferentially grow on carbon fibers with a higher degree of graphitization, and the microstructures of the carbon fibers play a crucial role in the formation of nanowires. Additionally, SiC nanowires exhibit strong ultraviolet-visible emission peaks in the photoluminescence spectrum, showing potential applications in optoelectronic devices.
Article
Chemistry, Physical
Ming-Yang Qu, Ting-Qu Li, Qiao-Li Liu
Summary: This study investigates the issues of traditional phosphor-converted white light emitting diodes (LEDs) caused by blue-green cavities in the luminescence spectrum. A series of cyan-emitting garnet phosphors were synthesized and analyzed for their optical properties and thermal quenching behavior. The relationship between synthesis temperature, energy gap, crystal field splitting, and the nephelauxetic effect on the luminescence intensity was studied. The study also explores the application of a cyan component in high-quality w-LEDs.
Article
Nanoscience & Nanotechnology
Max Kraut, Florian Pantle, Simon Worle, Elise Sirotti, Andreas Zeidler, Felix Eckmann, Martin Stutzmann
Summary: Nanowires and nanofins have strong interactions with their environment due to their large surface-to-volume ratio. Oxygen and water can both enhance and quench photoluminescence intensity in GaN nanostructures, with complex behaviors observed at different temperatures. Water-induced changes in photoluminescence intensity are light-induced, while oxygen-induced changes occur independently of illumination.
Article
Physics, Multidisciplinary
Hamid Esfahani, Nikou Khoshnoodan
Summary: This study focused on the electro-optical properties of mono and multilayer Al-doped ZnO (AZO) thin films (TFs) fabricated using the electrospinning method. The results showed that with the increase in the number of layers, the thickness and opacity of the films increased, while the optical band gap also increased.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Materials Science, Ceramics
U. C. Matur, I. P. Duru, D. Akcan
Summary: In this study, Mg-doped zinc oxide (MZO) thin films were deposited by sol-gel dip coating method to improve their physical properties. The structural and optical properties were investigated using XRD analysis, UV-VIS spectroscopy, and PL spectroscopy. The electronic properties were determined using the DFTB+ method. The experimental results were compared with theoretical calculations.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Multidisciplinary
Zeng Liu, Ling Du, Shao-Hui Zhang, Ang Bian, Jun-Peng Fang, Chen-Yang Xing, Shan Li, Jin-Cheng Tang, Yu-Feng Guo, Wei-Hua Tang
Summary: A flower-like SnO2-SnO/porous GaN (FSS/PGaN) heterojunction was fabricated for the first time, involving a spraying process, hydrothermal preparation of FSS, and electrochemical wet etching of GaN. The loaded SnO2-SnO composites with p-n junctions on the PGaN surface exhibited excellent transport capability, achieving a short response time and release time for H2S sensing. The obtained sensor showed high stability and potential for various applications.
Article
Physics, Multidisciplinary
Li-Li Yang, Yu-Si Peng, Zeng Liu, Mao-Lin Zhang, Yu-Feng Guo, Yong Yang, Wei-Hua Tang
Summary: A self-powered solar-blind ultraviolet (UV) photodetector (PD) was successfully fabricated on a Ga2O3/Bi2WO6 heterojunction. The PD demonstrated a distinct photovoltaic effect and excellent photodetection performance with an ultra-low dark current and a high light-to-dark current ratio in self-powered mode. The PD also showed a stable and fast response speed under different light intensities and voltages. Overall, the Ga2O3/Bi2WO6 heterojunction has the potential to be a candidate for self-powered and high-performance UV photodetectors.
Article
Physics, Multidisciplinary
Jian-Ying Yue, Xue-Qiang Ji, Shan Li, Xiao-Hui Qi, Pei-Gang Li, Zhen-Ping Wu, Wei-Hua Tang
Summary: In this study, solar-blind ultraviolet photodetectors with metal-semiconductor-metal structure were fabricated using β-(Al0.25Ga0.75)x(2)O(3)/β-Ga2O3 film. The performance of the β-Ga2O3 detector was significantly improved after surface passivation with β-(Al0.25Ga0.75)(2)O-3.
Article
Physics, Multidisciplinary
Yue-Hua An, Zhen-Sen Gao, Yu Guo, Shao-Hui Zhang, Zeng Liu, Wei-Hua Tang
Summary: The epsilon-Ga2O3 thin film was grown on a sapphire substrate using MOCVD method, and then utilized for the fabrication of a DUV photodetector. The thin film exhibited good crystal quality and surface morphology. The photodetector showed excellent optoelectronic performance and high wavelength selectivity when exposed to 254-nm DUV light, with a photoresponsivity of 175.69 A/W, detectivity of 2.46 x 10(15) Jones, EQE of 8.6 x 10(4)%, and good photocurrent-intensity linearity. At 5 V and under illumination with 800 mu W/cm(2) light intensity, a photocurrent gain as high as 859 was achieved due to the recycling gain mechanism and delayed carrier recombination; however, the photocurrent gain decreased with increasing incident light intensity due to the recombination of photogenerated carriers by the large photon flux.
Article
Engineering, Electrical & Electronic
Xiao-Hui Qi, Zeng Liu, Xue-Qiang Ji, Jian-Ying Yue, Yu-Song Zhi, Shan Li, Zu-Yong Yan, Yu-Feng Guo, Wei-Hua Tang
Summary: In this article, a deep-ultraviolet (DUV) photodetector (PD) based on a Ga2O3/TiO2 planar heterojunction is fabricated using both the solution and the metalorganic chemical vapor deposition (MOCVD) methods. The PD exhibits impressive DUV sensing properties, including high responsivity (R), specific detectivity (D-*), and external quantum efficiency (EQE). The PD can operate stably in a self-powered mode and has potential for applications in energy-conserving DUV sensing systems.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Jiawei Zhang, Yixuan Cui, Chunxiao Liu, Xiangfu Wang, Weihua Tang
Summary: This paper introduces a new flexible pressure sensor designed with LIG/AgNWs composite to improve ultra-high sensitivity and stability. The dependence of sensor property on LIG/NMP concentration and coating layers was studied, and the sensor showed good sensitivity (56.9 kPa(-1)) and stable performance. Its application in bending fingers and high fives was also studied, and results demonstrate its suitability for human body dynamic posture monitoring.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Review
Physics, Applied
Zeng Liu, Weihua Tang
Summary: This article discusses the recent progress of Ga2O3-based Schottky photodiodes and provides suggestions for Schottky metal selection, interfacial barrier modulation, space electric field adjustment, energy band engineering, and improvement of photodetection performance, aiming to promote the further development of deep-ultraviolet photodetection in the near future.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Xiaohong Li, Zahoor Ahmad, Xiao Zhang, Xiaoyu Luo, Zhihao Bao, Jinxia Li, Jianjun Chen
Summary: In this study, a novel strategy of iodine vapor curing was used to cure the fine-diameter PSZ fibers, and their pyrolysis behaviors at different temperatures were investigated. The results showed that the fine-diameter amorphous SiCN ceramic fibers had a high tensile strength of 1.08 +/- 0.26 GPa after pyrolysis at various temperatures. The pyrolysis process involved the transformation of unstable chemical bonds and active groups into Si3N structure, with the release of iodine, CH4, NH3, and cyclotrisiloxane.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Physics, Applied
Shan Li, Lili Yang, Zeng Liu, Maolin Zhang, Yufeng Guo, Weihua Tang
Summary: This study reported an ultraviolet photodetector constructed on a simple vertical PEDOT:PSS/SiC hybrid heterojunction, which demonstrated superior self-powered performance. The SiC based photodetector achieved self-powered responsivity over A/W level, comparable with many reported 4H-SiC avalanche photodiodes, due to the abundant charge carrier concentration in 4H-SiC substrate and the large built-in field at PEDOT:PSS/SiC heterointerface. The fabricated PD showed high responsivity, detectivity, and external quantum efficiency, fast rise/decay time, large on-off switching ratio, high spectral rejection ratio, and long lifetime reliability.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Xueqiang Ji, Jianying Yue, Xiaohui Qi, Zuyong Yan, Shan Li, Chao Lu, Zhitong Li, Zeng Liu, Song Qi, Xu Yan, Jinjin Wang, Shuang Wang, Peigang Li, Weihua Tang
Summary: In this study, stable and tunable electron concentration in fl-Ga2O3 homoepitaxial epitaxial films was achieved by using metal-organic chemical vapor deposition (MOCVD) on Fe-doped (010)-oriented fl-Ga2O3 substrates. The electrical properties of the films were found to vary depending on the concentration of Si ions incorporated during the growth process. The results suggest that stable and tunable electron concentration is crucial for optimizing high-power electronic devices based on fl-Ga2O3.
Article
Physics, Multidisciplinary
Maolin Zhang, Wanyu Ma, Qiong Zhang, Ang Bian, Zeng Liu, Lili Yang, Shan Li, Yufeng Guo, Weihua Tang
Summary: In this study, a heterojunction photodetector combining MAPbBr3 and GaN was constructed, and its detection capabilities were examined. The results demonstrated superior performance, including high rectification ratio and photo-to-dark current ratio. Additionally, the characteristics of the photodetector and possible methods for further performance enhancements were discussed.
Article
Engineering, Multidisciplinary
Gaohui Shen, Zeng Liu, Kai Tang, Shulin Sha, Lei Li, Chee-Keong Tan, Yufeng Guo, Weihua Tang
Summary: This study introduces an 8x8 Ga2O3 solar-blind ultraviolet photodetector array with high photo-response performance and uniform responsivity, which is of great significance for developing Ga2O3-based optoelectronic device applications.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyu Luo, Xiaohong Li, Zhihao Bao, Xiao Zhang, Haolin Li, Zahoor Ahmad, Jianjun Chen
Summary: Successfully fabricated amorphous polymer-derived SiCN ceramic fibres were achieved using homemade polysilazane (PSZ) through a series of processes including melt-spinning, UV curing, and pyrolyzing. The effects of UV irradiation time on the composition, microstructure, and ceramic yields of PSZ fibres were investigated. UV cross-linking reaction occurred on the surface layer of the PSZ fibres, where UV radiations played a critical role in accelerating the cleavage of Si-H, N-H, and C-H bonds to form cross-linked networks. The reported UV irradiation provides a novel curing method for the fabrication of SiCN ceramic fibres using PSZ fibres.
BULLETIN OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Song Qi, Jiahang Liu, Jianying Yue, Xueqiang Ji, Jiaying Shen, Yongtao Yang, Jinjin Wang, Shan Li, Zhenping Wu, Weihua Tang
Summary: In this work, a graphene/beta-Ga2O3/Ag asymmetric Schottky junction photodetector was constructed to address the issue of elevated dark currents in existing graphene/Ga2O3 devices. By taking advantage of the asymmetric structure design to suppress dark current and the transparent graphene electrode to increase carrier collection efficiency, the device achieved outstanding responsivity, detectivity, external quantum efficiency, and response time. Importantly, it exhibited low dark current and high light-to-dark ratio. Overall, the graphene/beta-Ga2O3/Ag asymmetric Schottky junction photodetector has considerable potential as a deep ultraviolet detector.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Physics, Multidisciplinary
Lei Li, Yu-Song Zhi, Mao-Lin Zhang, Zeng Liu, Shao-Hui Zhang, Wan-Yu Ma, Ma Qiang, Gao-Hui Shen, Xia Wang, Yu-Feng Guo, Wei-Hua Tang
Summary: In this study, a Ga2O3/Al0.1Ga0.9N heterojunction DU PD was successfully fabricated and its photodetection performance was evaluated. The experimental results showed that the PD exhibited good photocurrent response under 254nm and 365nm DUP light illumination, and had low dark current. In addition, the operating mechanism of the dual-band dual-mode heterojunction PD was analyzed, and it was found that it could be sensitive to UVA and UVC wavelengths, expanding its photodetection range.
ACTA PHYSICA SINICA
(2023)
