Article
Chemistry, Physical
Shuo Li, Qiang Wu, Haokun Ding, Songsong Wu, Xinwei Cai, Rui Wang, Jun Xiong, Guangyang Lin, Wei Huang, Songyan Chen, Cheng Li
Summary: In this study, a p-WSe2/n-Ge vdW heterojunction phototransistor with a Schottky barrier collector on n-Ge for broadband photodetection is reported. The phototransistor exhibits high responsivities, photocurrent gain, and fast response time, making it suitable for high-performance broadband photodetection.
Article
Materials Science, Multidisciplinary
Xue Li, Shuo-En Wu, Di Wu, Tianxiang Zhao, Pei Lin, Zhifeng Shi, Yongtao Tian, Xinjian Li, Longhui Zeng, Xuechao Yu
Summary: Infrared detection is crucial for military and civilian applications. Recent research has shown the potential of 2D topological semimetals in infrared detection due to their unique advantages. However, challenges such as large-scale patterning and low photoresponsivity hinder their wider applications. This study demonstrates the fabrication of high-quality PtSe2/Ge Schottky junctions for infrared detection, achieving broadband response, high-specific detectivity, and stability.
Article
Chemistry, Multidisciplinary
Sungjun Kim, Sunghun Lee, Seyong Oh, Kyeong-Bae Lee, Je-Jun Lee, Byeongchan Kim, Keun Heo, Jin-Hong Park
Summary: A ferroelectric gating ReS2/WSe2 vdW heterojunction-channel photodetector is presented in this study, which achieves broadband light detection and can be expanded up to 2700 nm. The staggered type-II bandgap alignment creates an interlayer gap of 0.46 eV between the valence band maximum of WSe2 and the conduction band minimum of ReS2. By controlling the ferroelectric dipole polarity of P(VDF-TrFE) at a specific wavelength, the device achieves high photoresponsivity, low dark current, and full-range near infrared detection capability.
Article
Chemistry, Physical
Yupiao Wu, Shuo-En Wu, Jinjin Hei, Longhui Zeng, Pei Lin, Zhifeng Shi, Qingming Chen, Xinjian Li, Xuechao Yu, Di Wu
Summary: This study presents the controllable growth of large-area 2D MoSe2 layers and the fabrication of a high-quality n-MoSe2/p-Si van der Waals heterojunction device. The device exhibited a self-driven broadband photoresponse with impressive responsivity, specific detectivity, and response time. Furthermore, a 4 x 4 integrated heterojunction device array was achieved with good uniformity and satisfying imaging capability. The large-area 2D MoSe2 layer and its heterojunction device array hold great promise for high-performance photodetection and imaging applications in integrated optoelectronic systems.
Article
Nanoscience & Nanotechnology
Di Wu, Zhiheng Mo, Yanbing Han, Pei Lin, Zhifeng Shi, Xu Chen, Yongtao Tian, Xin Jian Li, Huiyu Yuan, Yuen Hong Tsang
Summary: The study successfully fabricated a PdSe2/CdTe mixed-dimensional van der Waals heterojunction capable of detecting long-wave infrared radiation at room temperature. The device has a fast response rate, high responsivity, and reasonable specific detectivity, making it suitable for detecting short pulse infrared signals and highly sensitive to polarized infrared light signals.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Pengyu Li, Yinghe Zhao, Huiqiao Li, Tianyou Zhai
Summary: This study systematically investigates the working mechanisms of Sb2O3 and two Sb2O3-like molecules (As2O3 and Bi2O3) as dielectrics, using a combination of first-principles calculations and gate leakage current theories. It is found that molecules-based vdW dielectrics have a significant advantage over conventional materials, as defects have hardly any impact on their insulating properties. Furthermore, the study reveals that Sb2O3 faces challenges in meeting the requirements for both p-MOS and n-MOS devices, while As2O3 can serve as a dielectric for both types. This research provides a theoretical foundation for the application of molecules-based vdW dielectrics and offers a competitive choice (As2O3) for optimizing the dielectric layer in 2D vdW semiconductor-based CMOS devices, with profound implications for the future semiconductor industry.
Article
Nanoscience & Nanotechnology
Juanmei Duan, Phanish Chava, Mahdi Ghorbani-Asl, YangFan Lu, Denise Erb, Liang Hu, Ahmad Echresh, Lars Rebohle, Artur Erbe, Arkady Krasheninnikov, Manfred Helm, Yu-Jia Zeng, Shengqiang Zhou, Slawomir Prucnal
Summary: This study presents a high-performance and self-powered photodetector based on a MoSe2/FePS3 type-II n-p heterojunction. The photodetector operates at room temperature under zero bias and ambient conditions, exhibiting a wide working range and superior responsivity and quantum efficiency.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Xuran Zhang, Mingjin Dai, Wenjie Deng, Yongzhe Zhang, Qi Jie Wang
Summary: A PdSe2 photodetector with asymmetric van der Waals contacts is reported, achieving a high responsivity, fast rise/decay times, and a high detectivity in the visible-near infrared range. The device also shows linear polarization-sensitive response and outstanding polarization imaging capabilities. This PdSe2-based photodetector has great potential for high-performance applications without external bias.
Article
Chemistry, Physical
Z. H. Li, J. N. Han, S. G. Cao, Z. H. Zhang
Summary: To achieve miniaturized and high-performance nanoelectronic devices, obtaining ohmic contact at metal-semiconductor interface is crucial. In this study, H- and T-NbS2/MoSi2P4 van der Waals heterojunctions (vdWHs) were constructed and their mechanical and electronic behaviors were explored. Our results show that these vdWHs can act as electrode or channel materials due to their suitable Poisson's ratio and rigidity. We also found that quasi-ohmic contact can be achieved in H-NbS2/MSP in the intrinsic equilibrium state, while entire ohmic contacts can be obtained by applying appropriate electric field in both H- and T-NbS2/MSP. Based on these findings, we designed 5 nm gate-controlled Schottky junction devices, which showed high rectification ratio and asymmetric electron transport.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Abhinandan Antony, Martin Gustafsson, Guilhem J. Ribeill, Matthew Ware, Anjaly Rajendran, Luke C. G. Govia, Thomas A. Ohki, Takashi Taniguchi, Kenji Watanabe, James Hone, Kin Chung Fong
Summary: By utilizing van der Waals materials, quantum bits can be reduced in size while maintaining capacitance and quantum coherence, potentially enabling high qubit-density quantum processors. This study demonstrates the broad utility of layered heterostructures in low-loss, high-coherence quantum devices.
Article
Materials Science, Multidisciplinary
Xiwei Zhang, Jie Zhu, Shaohui Wang, Yingkai Geng, Jingyu Zhang, Dan Liu, Manhong Li, Hengbo Zhang, Huijuan Geng, Zhenjie Tang
Summary: This study develops a Ti3C2Tx/Ge vdW Schottky junction photodetector with an Al2O3 interfacial layer, which shows positive effects on light current generation and dark current suppression. The device exhibits a broadband response spectrum and high photodetection performance.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Won-Yong Lee, Min-Sung Kang, Gil-Sung Kim, Jae Won Choi, No-Won Park, Yumin Sim, Yun-Ho Kim, Maeng-Je Seong, Young-Gui Yoon, Eiji Saitoh, Sang-Kwon Lee
Summary: A new interface-induced Seebeck effect has been discovered, which generates a driving voltage from thermal flow at the interface of thin PtSe2/PtSe2 Van der Waals homostructure. By directly attaching multilayered PtSe2 to high-resistance PtSe2 thin films, the Seebeck coefficient of the homostructure was significantly enhanced.
Article
Nanoscience & Nanotechnology
Da Wan, Qixia Wang, Hao Huang, Bei Jiang, Chen Chen, Zhenyu Yang, Guoli Li, Chuansheng Liu, Xingqiang Liu, Lei Liao
Summary: MoS2 metal semiconductor field-effect transistors with GeSe/MoS2 van der Waals Schottky junction as a local gate exhibit hysteresis-free characteristics and an ideal subthreshold swing, making them suitable for low-power digital electronics design based on 2D materials. An OR logic gate can be constructed with the dual-gated MoS2 transistors, showing promising potential for low-power electronic applications.
Article
Materials Science, Multidisciplinary
Zegao Wang, Xuya Xiong, Jiheng Li, Mingdong Dong
Summary: By introducing an rGO buffer layer in MoS2 transistors, van der Waals contacts can be formed effectively, leading to a significant improvement in device performance.
MATERIALS TODAY PHYSICS
(2021)
Article
Chemistry, Physical
Huawei Liu, Lizhen Fang, Xiaoli Zhu, Chenguang Zhu, Xingxia Sun, Gengzhao Xu, Biyuan Zheng, Ying Liu, Ziyu Luo, Hui Wang, Chengdong Yao, Dong Li, Anlian Pan
Summary: A novel contact strategy using Bi2Te3 nanosheets as van der Waals contacts on MoS2 is proposed in this study to address the poor contact quality issue in two-dimensional semiconductor-based field effect transistors (FETs). The results show that the MoS2 FET device with Bi2Te3 contacts exhibits higher performance and smaller Schottky barrier height.
Review
Engineering, Chemical
Lei Wang, Ziyu Huang, Xiaohui Yang, Lukas Rogee, Xiaowen Huang, Xuming Zhang, Shu Ping Lau
Summary: With the development of modern industry, four interrelated issues have become increasingly prominent: environmental pollution, the energy crisis, the greenhouse effect, and the global food crisis. Photocatalysis is a promising method to address these challenges, and the use of photocatalytic optofluidic microreactors could further enhance efficiency and utilization of solar energy. These microreactors offer advantages such as a large surface-to-volume ratio, short molecular diffusion length, and high reaction efficiency, making them a potential solution for mitigating these crises. This paper provides a comprehensive review of microreactor designs and developments in the fields of water purification, water splitting, CO2 fixation, and coenzyme regeneration in recent years. As the most promising tool for solar energy utilization, the increasing innovation in photocatalytic optofluidic microreactors is expected to drive rapid development in related fields in the future.
REVIEWS IN CHEMICAL ENGINEERING
(2023)
Article
Nanoscience & Nanotechnology
Wei Han, Xiaodong Zheng, Ke Yang, Chi Shing Tsang, Fangyuan Zheng, Lok Wing Wong, Ka Hei Lai, Tiefeng Yang, Qi Wei, Mingjie Li, Weng Fu Io, Feng Guo, Yuan Cai, Ning Wang, Jianhua Hao, Shu Ping Lau, Chun-Sing Lee, Thuc Hue Ly, Ming Yang, Jiong Zhao
Summary: Large-scale 2D beta-In2Se3 films and alpha-In2Se3 films were successfully grown by chemical vapor deposition, and a complete phase transition enabled the obtainment of a full spectrum of paraelectric, ferroelectric and antiferroelectric 2D films.
NATURE NANOTECHNOLOGY
(2023)
Article
Optics
Menghan Jia, Fang Wang, Libin Tang, Jinzhong Xiang, Kar Seng Teng, Shu Ping Lau, Yanfei Lu
Summary: UV photodetectors based on metal oxide heterostructures have gained significant interest due to their excellent performance and ease of fabrication. In this study, a UV photodetector consisting of p-NiO/SiO2/n-ZnO heterostructure was prepared by RF magnetron sputtering method, exhibiting remarkable performances such as high rectification ratio, responsivity, and external quantum efficiency at low power consumption.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Applied
Fangyi Shi, Lingling Zhai, Qingqing Liu, Jingya Yu, Shu Ping Lau, Bao Yu Xia, Zheng-Long Xu
Summary: This study reviews the latest catalytic materials for practical high-energy lithium-sulfur batteries (LSBs) and explores the relationship between catalyst design strategies, material structures, and electrochemical performance. The authors also statistically evaluate the state-of-the-art catalyst-modified LSBs to identify the remaining gap between current advancements and real-world requirements. Finally, the authors propose a study on catalytic materials to help realize practical LSBs.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Article
Chemistry, Physical
Md. Nahian Al Subri Ivan, Ahmed Mortuza Saleque, Safayet Ahmed, Zong Liang Guo, Di Zu, Linli Xu, Tawsif Ibne Alam, Sumaiya Umme Hani, Yuen Hong Tsang
Summary: To tackle the challenge of salt accumulation on solar-absorbing surface in solar desalination, sustainable evaporators with diverse salt mitigation mechanisms were fabricated using alkali-treated jute stick. One mechanism relies on the natural hole and microchannel structure of jute stick to induce salt ion diffusion backflow, effectively preventing salt accumulation. Another mechanism involves coating the jute stick with hydrophobic multi-walled carbon nanotubes, creating a direct salt blocking and diffusion backflow mechanism.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Optics
Di Wu, Chenguang Guo, Longhui Zeng, Xiaoyan Ren, Zhifeng Shi, Long Wen, Qin Chen, Meng Zhang, Xin Jian Li, Chong-Xin Shan, Jiansheng Jie
Summary: Being able to sense broadband infrared light is crucial for various applications. Two-dimensional topological semimetals have been explored for this purpose due to their electronic structure and energy dispersion relation. However, their limitations in charge separation efficiency, noise level, and integration hinder their use in technology.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Multidisciplinary Sciences
Renzhong Zhuang, Songhua Cai, Zengxia Mei, Huili Liang, Ningjiu Zhao, Haoran Mu, Wenzhi Yu, Yan Jiang, Jian Yuan, Shuping Lau, Shiming Deng, Mingyue Han, Peng Jin, Cailin Wang, Guangyu Zhang, Shenghuang Lin
Summary: In order to reduce radiation health risks, X-ray detectors need to be operated at minimal doses during X-ray security examination or medical inspection, which requires high sensitivity and low detection limits. This study presents the realization of highly sensitive X-ray detectors based on an environmentally friendly solution-grown thick BiI/BiI3/BiI van der Waals heterostructure. These detectors show anisotropic X-ray detection response, with a sensitivity of up to 4.3 x 10(4) μC Gy(-1) cm(-2) and a detection limit as low as 34 nGy s(-1). Additionally, the BixIy detectors demonstrate high environmental and hard radiation stabilities.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Fangyi Shi, Xuyun Guo, Chunhong Chen, Lyuchao Zhuang, Jingya Yu, Qi Qi, Ye Zhu, Zheng-Long Xu, Shu Ping Lau
Summary: A recent study examines the dynamics of liquid-to-solid sulfur transition and investigates the charging of polysulfides by visually observing the electrochemical generation of sulfur. The study finds a quantitative correlation between the size and number density of liquid sulfur droplets and the applied current, providing insights for designing fast-charging sulfur cathodes.
Article
Chemistry, Multidisciplinary
Longhui Zeng, Wei Han, Xiaoyan Ren, Xue Li, Di Wu, Shujuan Liu, Hao Wang, Shu Ping Lau, Yuen Hong Tsang, Chong-Xin Shan, Jiansheng Jie
Summary: A low-temperature self-stitched epitaxy approach was used to grow 2D palladium ditelluride (PdTe2) Dirac semimetal with excellent infrared photoresponse, enabling the fabrication of highly integrated mid-infrared imaging chips. The on-chip PdTe2/Si Schottky junction-based photodetector exhibited ultrabroadband photoresponse and high detectivity. This study paves the way for the low-temperature growth of 2D semimetals for uncooled mid-infrared sensing.
Article
Materials Science, Multidisciplinary
Raja Rashidul Hasan, Jasika Jasmine, Ahmed Mortuza Saleque, Sumit Hassan Eshan, Raja Tariqul Hasan Tusher, Sadia Zabin, Nadia Nowshin, Md. Abdur Rahman, Yuen Hong Tsang
Summary: This paper proposes the use of a small patch antenna with multiwall carbon nanotubes (MWCNTs) for early detection of breast cancer. The antenna shows promising results in free space and on a breast phantom model, making it a cost-effective and portable screening tool, particularly in resource-constrained regions.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Physical
Safayet Ahmed, Yiyu Gan, Ahmed Mortuza Saleque, Honglei Wu, Junpeng Qiao, Md. Nahian Al Subri Ivan, Sumaiya Umme Hani, Tawsif Ibne Alam, Qiao Wen, Yuen Hong Tsang
Summary: The 2D semi-metallic hafnium ditelluride material, with its strong near-infrared absorbance, high sensitivity, and distinctive electronic structure, finds applications in solar steam generation, gas sensing, and catalysis. Its zero-bandgap characteristics and thermal and dynamic stability make it a desirable choice for long-wavelength-range photonics devices. By utilizing a side polished fiber-based HfTe2-saturable absorber (SA), a mode-locked laser with high stability and low pump threshold is realized, paving the way for improved laser development and narrow photonic applications.
Article
Materials Science, Multidisciplinary
Baofeng Lv, Yongyong Pei, Shuo-En Wu, Tingting Xu, Xiaowen Huang, Yongtao Tian, Xinchang Wang, Longhui Zeng, Xinjian Li
Summary: Researchers have successfully prepared a SnO2/WS2 hybrid heterostructure gas sensing material, which exhibits high response and selectivity to NO gas at low temperature. The material has SnO2 nanocrystals uniformly dispersed on WS2 nanosheets, increasing the presence of oxygen vacancies and Sn2+. The response rate of the material to 5 ppm NO gas reaches 6.24, which is 6.10 and 4.21 times higher than that of SnO2 microspheres and WS2 nanosheets, respectively. Therefore, this material shows good performance and has the potential for monitoring NO gas exhaled by humans.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Xue Li, Shuo-En Wu, Di Wu, Tianxiang Zhao, Pei Lin, Zhifeng Shi, Yongtao Tian, Xinjian Li, Longhui Zeng, Xuechao Yu
Summary: Infrared detection is crucial for military and civilian applications. Recent research has shown the potential of 2D topological semimetals in infrared detection due to their unique advantages. However, challenges such as large-scale patterning and low photoresponsivity hinder their wider applications. This study demonstrates the fabrication of high-quality PtSe2/Ge Schottky junctions for infrared detection, achieving broadband response, high-specific detectivity, and stability.
Article
Materials Science, Multidisciplinary
Junpeng Qiao, Safayet Ahmed, Jialiang Yu, Ranran Fan, Guangqiang Liu, Yuen Hong Tsang, Sujuan Feng
Summary: This paper investigates the nonlinear optical properties of 1T-CrTe2 nanoparticles and explores their potential in ultrafast photonics applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Haiyan Jin, Lok Wing Wong, Ka Hei Lai, Xiaodong Zheng, Shu Ping Lau, Qingming Deng, Jiong Zhao
Summary: A simple fabrication method for vacancy-rich IrCo alloy catalysts has been developed by post-annealing single atom dispersed precursors. The resulting catalyst exhibits enhanced activity and stability compared to traditional methods.
