Article
Nanoscience & Nanotechnology
Jing Zhong, Xi Zhang, Gang Xiang
Summary: In this study, self-powered amorphous MoSe2 photodetectors were designed and fabricated, demonstrating excellent performance in terms of photocurrent, photoresponsivity, detectivity, and low noise-equivalent power and photoresponse rise/decay time. The high-performance mechanism can be explained by the energy band theory and volume modulation photoconductive gain model.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Jiawen You, Zijing Jin, Yuyin Li, Ting Kang, Kenan Zhang, Wenliang Wang, Mengyang Xu, Zhaoli Gao, Jiannong Wang, Jang-Kyo Kim, Zhengtang Luo
Summary: This study successfully synthesizes mixed-dimensional heterostructures, in which pseudo-1D tellurium is epitaxially grown on 2D monolayer transition metal dichalcogenides. Photoluminescence results confirm the efficient transfer of photogenerated carriers from the transition metal dichalcogenides to tellurium in the heterostructure. Additionally, the heterojunction photodetector exhibits self-driven behavior and high-performance.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yiping Hu, Qinghai Zhu, Jiabao Sun, Yijun Sun, Nobutaka Hanagata, Mingsheng Xu
Summary: PdSe2/Si heterojunction photodetectors with different thicknesses of PdSe2 films were designed and fabricated, and the photodetector with a 35nm PdSe2 film exhibited better performance. The PDs showed high responsivity and specific detectivity at 808nm wavelength. Additionally, the PdSe2/Si PD array demonstrated excellent uniformity and stability at room temperature, showing potential for image sensing in the UV-vis-NIR wavelength range.
Article
Chemistry, Physical
Dongxiang Li, Ruiqin Li, Dantong Zhou, Fanjin Zeng, Xinmao Qin, Wanjun Yan, Shaohong Cai
Summary: In this study, Cs-I-BP and Sn-I-BP heterostructures were investigated for their self-powered capability and absorption performance. The results show promising applications in wearable electronics and high-performance optoelectronic devices.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Jinping Chen, Zhen Zhang, Yi Ma, Jiying Feng, Xiaoyu Xie, Xiaoxuan Wang, Aoqun Jian, Yuanzheng Li, Zhuxin Li, Heng Guo, Yizhi Zhu, Qiannan Cui, Zengliang Shi, Chunxiang Xu
Summary: A WS2/InSe van der Waals heterostructure (vdWH) photodiode was fabricated by stacking InSe and WS2 flakes using an all-dry transfer method. The heterostructure exhibited excellent photovoltaic behavior with a large open voltage, short-circuit current, fast response time, high light on/off ratio, high responsivity, and broadband photoresponse. This study provides a strategy for developing high-performance self-powered broadband photodetectors based on 2D materials.
Article
Chemistry, Physical
Jinping Chen, Zhen Zhang, Yi Ma, Jiying Feng, Xiaoyu Xie, Xiaoxuan Wang, Aoqun Jian, Yuanzheng Li, Zhuxin Li, Heng Guo, Yizhi Zhu, Qiannan Cui, Zengliang Shi, Chunxiang Xu
Summary: This study presents a WS2/InSe vdWH photodiode based on 2D materials, which exhibits excellent photovoltaic behavior and broadband photoresponse due to the precise stacking and energy-band alignment.
Article
Chemistry, Physical
Siyu Feng, Zitong Liu, Lizhi Feng, Junchao Wang, Hanning Xu, Lijie Deng, Ouxiang Zhou, Xin Jiang, Baodan Liu, Xinglai Zhang
Summary: In this study, a novel n-Ga2O3/p-GaN vertical heterojunction was designed to construct a high-performance UV photodetector. It demonstrated low dark current and fast photoresponse speed, and could operate at 0 V bias with enhanced UV photoresponse and self-powered mechanism. Moreover, it was used as an imaging pixel in the imaging system, resulting in vivid image.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Chunyu Li, Zhiming Wu, Chaoyi Zhang, Silu Peng, Jiayue Han, Meiyu He, Xiang Dong, Jun Gou, Jun Wang, Yadong Jiang
Summary: A high-performance self-powered photodetector based on an all-2D van der Waals heterojunction of metallic 2H-NbSe2 and semiconducting MoSe2 is fabricated, exhibiting high rectification ratio, responsivity, and fast response/recovery time. This study demonstrates the potential of 2D metallic NbSe2 as an electrode for realizing a high-performance broadband photodetector for near-infrared communication.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Harmanpreet Kaur Sandhu, John Wellington John, Alka Jakhar, Abhishek Sharma, Alok Jain, Samaresh Das
Summary: This study demonstrates the fabrication of MoSe2/p-GaN heterostructure for light detection, exhibiting low noise broadband spectral response and high photocurrent to dark current ratio. The device achieves high responsivity and low noise equivalent power at an applied bias of 1 V, with fast rise/fall time.
Article
Engineering, Electrical & Electronic
Ping Rong, Mouwen Mao, Shiyong Gao, Huiqing Lu, Shuai Ren, Lin Li, Zhikun Xu, Duoduo Ling, Mingrui Han, Jinzhong Wang
Summary: In this study, a novel hedgehog-like ZnO/SnO2 hierarchical heterostructure was successfully prepared and applied in ultraviolet photodetector (UVPD), exhibiting excellent performance with high photoresponsivity and strong photocurrent density.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Liangliang Min, Wei Tian, Fengren Cao, Jun Guo, Liang Li
Summary: This research successfully controlled the phase distribution of 2D perovskites using a solvent additive method and hot-casting process, which improved photoresponse of devices. The optimized device showed high performance, stability, and fast response speed in optical-electronic conversion.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Zhichen Wan, Haoran Mu, Zhuo Dong, Sigui Hu, Wenzhi Yu, Shenghuang Lin, Sudha Mokkapati
Summary: This study demonstrates a simple way to engineer a photodetector based on a MoSe2/ZnO heterojunction, achieving an atomically sharp n-n junction with current rectification behavior. The photodetector exhibits a fast photoresponse speed and a high peak responsivity.
MATERIALS & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Wennan Hu, Hu Wang, Jianguo Dong, Haoran Sun, Yue Wang, Zhe Sheng, Zengxing Zhang
Summary: A high-performance self-driven photodetector based on MoTe2/MoSe2 heterojunction is fabricated by a simple thermal annealing treatment. The doping method is also utilized to achieve a complementary inverter and logic gates. These results present a significant potential for larger-scale heterogeneously integrated 2D electronics and optoelectronics.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Manoj Kumar, Sanju Rani, Reena Yadav, Yogesh Singh, Manju Singh, Sudhir Husale, V. N. Singh
Summary: Self-powered and flexible photodetectors offer a promising future for the optoelectronic industry. The use of an isotype heterostructure, SnSe-Sb2Se3, has shown stable and fast response in the Vis-NIR range, even after 1500 bending cycles. This structure also demonstrates enhanced absorption in the entire Vis-NIR spectrum, making it suitable for applications in solar cells.
SURFACES AND INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Sajeevi S. Withanage, Saiful Khondaker
Summary: This study reports the low pressure chemical vapor deposition (LPCVD) growth of PdSe2 at a significantly lower growth temperature of 250 degrees C. The study examines the structural and electrical properties of the synthesized films and demonstrates the potential applications of PdSe2 in electronic devices.
Article
Chemistry, Physical
Haihong Zheng, Biao Wu, Shaofei Li, Jun He, Keqiu Chen, Zongwen Liu, Yanping Liu
Summary: The modulation of moire potential and intralayer excitons in WS2/WS2 homostructure is observed in this study. By adjusting the twist angle, the depth of the moire potential can be modulated, and the confinement effect of the moire potential on intralayer excitons is demonstrated. Furthermore, atomic reconstructions are detected using low-frequency Raman mapping to ensure the uniformity of interlayer coupling.
Article
Chemistry, Physical
Biao Wu, Haihong Zheng, Shaofei Li, Chang -Tian Wang, Junnan Ding, Jun He, Zongwen Liu, Jian-Tao Wang, Yanping Liu
Summary: The recent discovery of various moire-related properties in twisted vertical stacking structures has attracted significant attention, particularly in transition metal dichalcogenide heterostructures. This study presents the observation of moire excitons in homostructures with different layer-coupling interactions, and the results show that reducing the number of underlying layers increases the moire potential. The effects of temperature, laser power, and valley polarization on moire excitons were also investigated, providing insights into their spectral features. These findings pave the way for the exploration of quantum phenomena and related applications in quantum information.
Article
Chemistry, Multidisciplinary
Haihong Zheng, Hongli Guo, Shula Chen, Biao Wu, Shaofei Li, Jun He, Zongwen Liu, Gang Lu, Xidong Duan, Anlian Pan, Yanping Liu
Summary: WSe2/WSe2 homobilayers with different twist angles were synthesized using a heteroatom-assisted chemical vapor deposition (CVD) technique. The uniformity of the moire superlattices in the homobilayers fabricated by CVD was mapped using low-frequency Raman scattering, demonstrating strong interfacial coupling. The moire potential depths of the CVD-grown and artificially stacked homostructures with a twist angle of 1.5 degrees were 115 and 45 meV (an increase of 155%), indicating the modulation of moire potential depth through interfacial coupling.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Hong Zhao, Zhong Zheng, Haoruo Zhou, Li Chang, Kostadinos Tsoutas, Limei Yang, Seyedeh K. H. Alavi, Yanping Liu, Behnam Akhavan, Marcela M. Bilek, Zongwen Liu
Summary: High entropy alloys (HEAs) are a new class of materials with high strength, high corrosion and oxidation resistance, and superb thermal stability. In this study, AlCrFeCoNiCu0.5 HEA thin films were fabricated using cathodic arc deposition, and the growth mechanisms and microstructures of the films were investigated by varying arc and duct currents. The crystallography of the films was analyzed using X-ray diffraction (XRD), and the film chemistry and microstructure of the film-substrate interphase were comprehensively studied using transmission electron microscopy (TEM). The results show that the grain size, hardness, and surface roughness of the HEA thin films can be effectively controlled. This study has important implications for the industrial-scale fabrication of HEA thin films using cathodic arc deposition.
SURFACES AND INTERFACES
(2023)
Article
Optics
Haihong Zheng, Biao Wu, Shaofei Li, Jun He, Zongwen Liu, Chang-Tian Wang, Jian-Tao Wang, Ji-An Duan, Yanping Liu
Summary: We demonstrate the generation and detection of strained localized excitons in monolayer WSe2 by fabricating strained structures using nanoindentation technique. Enhanced emission of strain-localized excitons is observed with two sharp photoluminescence peaks. The valley polarization of strained localized excitons is increased, reaching a high value of approximately 79.6%, by modulating a magnetic field. These findings highlight the potential of tunable valley polarization and localized excitons in WSe2 monolayers for valleytronic applications.
Article
Chemistry, Multidisciplinary
Haihong Zheng, Biao Wu, Chang-Tian Wang, Shaofei Li, Jun He, Zongwen Liu, Jian-Tao Wang, Ji-an Duan, Yanping Liu
Summary: This work synthesizes a twisted WSe2 homotrilayer and investigates the enhancement of the moire potential with increasing number of twisted layers. The study reveals the presence of multiple exciton resonances confined to the moire potential in the WSe2 homostructure with small twist angles. The moire potential depths of the twisted bilayer and trilayer homostructures are found to be 111 and 212 meV, respectively, an increase of 91% from the bilayer structure.
Article
Optics
Haihong Zheng, Biao Wu, Shaofei Li, Junnan Ding, Jun He, Zongwen Liu, Chang-Tian Wang, Jian-Tao Wang, Anlian Pan, Yanping Liu
Summary: This study presents experimental evidence of localization-enhanced moire excitons in twisted WSe2/WS2/WSe2 heterotrilayers. The confinement effect of moire potential on moire excitons is demonstrated through changes in temperature, laser power, and valley polarization. The findings have implications for the localization of moire excitons and the development of coherent quantum light emitters.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yassine Madoune, DingBang Yang, Yameen Ahmed, Mansour M. Al-Makeen, Han Huang
Summary: Atomically thin layered transition metal dichalcogenides (TMDs) such as MoS2 and WS2 have attracted much attention due to their interesting electronic and optoelectronic properties. In particular, spiral TMDs offer a variety of materials to study light-matter interaction and potential applications in optoelectronic and nanoelectronic devices. By controlling the growth conditions, the researchers successfully grew spiral pyramid-shaped WS2 nanostructures using Physical Vapor Deposition (PVD) technique. The study provides insights into the growth mechanism of these spiral-patterned WS2 nanostructures, which can have different morphologies and stacking.
FRONTIERS IN CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Biao Wu, Haihong Zheng, Shaofei Li, Chang-Tian Wang, Junnan Ding, Jun He, Zongwen Liu, Jian-Tao Wang, Yanping Liu
Summary: This study reports the fabrication of homogeneous moire superlattices with controllable twist angles and the tuning of their optical properties using additional layers. The presence of these layers reduces the inhomogeneity of the superlattice and enhances the localized moire excitons. The existence of moire excitons is confirmed through experimental observations and theoretical calculations.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Xing Xie, Junnan Ding, Biao Wu, Haihong Zheng, Shaofei Li, Chang-Tian Wang, Jun He, Zongwen Liu, Jian-Tao Wang, Yanping Liu
Summary: This study presents a dynamic tuning method for twisted WSe2/WSe2 homobilayers and demonstrates the powerful tuning of interlayer coupling. It is found that the introduction of a moire superlattice leads to hybridized excitons and different pressure-evolution exciton behaviors compared to natural bilayers.
Article
Optics
Biao Wu, Xing Xie, Haihong Zheng, Shaofei Li, Junnan Ding, Jun He, Zongwen Liu, Yanping Liu
Summary: This study reveals the possibility of introducing artificial anisotropy in symmetric 2D semiconductors through interlayer van der Waals coupling engineering. By analyzing the photoluminescence spectra and Raman spectra, we discovered the anisotropic optical properties of monolayer MoSe2 and provided a conceptual blueprint for designing isotropic and anisotropic heterostructures.
Article
Crystallography
Yassine Madoune, Sid Ali Madoune, Luzhi Zhang, Reyadh A. M. Taha, Fuad A. Awwad, Emad A. A. Ismail
Summary: Two-dimensional layered transition-metal dichalcogenides (2D-TMDs) have attracted significant attention for their layer number-dependent electronic properties and potential applications in atomically thin electronics and optoelectronics. However, the current research primarily focuses on exfoliated materials, which have limitations in size, layer number control, and yield. This study successfully synthesized large TMD crystals with precise layer number control by optimizing growth conditions, including temperature, precursor flow, growth duration, material quantity, gas flow, and slide position. The findings provide a robust pathway for the rapid growth of high-quality TMD single crystals, contributing to advancements in the field.
Article
Chemistry, Physical
Yassine Madoune, Ayman A. A. Ismail
Summary: This study presents Raman spectroscopy measurements of SDD-SSP-WS2 samples supported on SiO2/Si at various temperature ranges. The major causes of the non-linear dependency of the Raman mode are identified to be four-phonon scattering and thermal expansion effect. The investigation of the broadening of FWHM A1g mode suggests the decay of the A1g phonon.
SURFACES AND INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Xing Xie, Junnan Ding, Biao Wu, Haihong Zheng, Shaofei Li, Jun He, Zongwen Liu, Jian-Tao Wang, Yanping Liu
Summary: Layered materials, such as MoTe2, exhibit thickness-dependent interlayer vibrations, which can be controlled and explained through pressure engineering. By studying the pressure-induced behavior of breathing and shear modes in MoTe2, we have gained a better understanding of the layer-dependent interlayer vibrations and proposed models to explain the observations.
Article
Chemistry, Physical
Haihong Zheng, Biao Wu, Shaofei Li, Jun He, Keqiu Chen, Zongwen Liu, Yanping Liu
Summary: We report the modulation of moire potential and intralayer excitons in the WS2/WS2 homostructure. By adjusting the torsion angle of the homobilayers, the depth of the moire potential can be modulated. The confinement effect of the moire potential on the intralayer excitons was demonstrated through temperature and valley polarization changes. Furthermore, atomic reconstructions were detected using low-frequency Raman mapping, providing insights into the inhomogeneities in moire lattices on a large scale and promoting the study of electrical engineering and topological photonics.
