Article
Materials Science, Multidisciplinary
Yun Zhao, Xiaoqiang Feng, Menghan Zhao, Xiaohu Zheng, Zhiduo Liu, Siwei Yang, Shiwei Tang, Da Chen, Gang Wang, Guqiao Ding
Summary: The new method of preparing graphene and quantum dot photodetectors shows potential in improving device performance, efficiently collecting photo-generated carriers and exhibiting high responsivity and detectivity. By integrating with single-crystal graphene, C3N quantum dots can enhance the local electric field near graphene, achieving fast response and recovery.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Review
Materials Science, Multidisciplinary
Mao-Kun Zhang, Wei-Di Liu, You-Pin Gong, Qingfeng Liu, Zhi-Gang Chen
Summary: Graphene is an ideal material for photodetection due to its high carrier mobility and stability, but its weak light absorption hinders its practical applications. To overcome this limitation, quantum dots are hybridized with graphene to achieve wide-range and intense light absorption. In this paper, the significance, synthesis methods, and performance engineering strategies of graphene/quantum dot heterostructure photodetectors are systematically discussed.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Ruiyang Yan, Chan Yang, Zhongmin Guo, Yihan Hua, Pei Li, Xinru Zhang, Shuanglong Feng
Summary: A hybrid structure of nanoparticle Bi/PbS submicron plate photodetector was fabricated by electrochemical atomic layer epitaxy, which exhibited excellent properties and improved response speed compared to previous studies. The high-quality single crystal PbS rods and perfect coating of Bi were confirmed by SEM, AFM, and TEM analysis. This work opens up new opportunities for the development of high-sensitivity photodetectors based on metal nanoparticles and semiconductors for industrial and commercial applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Materials Science, Multidisciplinary
Maral Vafaie, James Z. Fan, Amin Morteza Najarian, Olivier Ouellette, Laxmi Kishore Sagar, Koen Bertens, Bin Sun, F. Pelayo Garcia de Arquer, Edward H. Sargent
Summary: Efficient ligand exchange route enables large-diameter CQDs to achieve high-efficiency passivation and charge transport, leading to CQD solids with external quantum efficiency greater than 80% at 1,550 nm. This technology has the potential to replace conventional III-V semiconductors and make significant advancements in the field of infrared photodetection.
Article
Chemistry, Physical
Majid Ghandchi, Ghafar Darvish, Mohammad Kazem Moravvej-Farshi
Summary: The electro-optical properties of photodetectors based on mono- and bilayer graphene quantum dots were investigated. These photodetectors showed superior performance to structures based on graphene nanoribbons and are suitable for use in optical integrated circuits.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Youngsin Park, Guanhua Ying, Robert A. Taylor, Chan C. Hwang
Summary: The carrier dynamics of excitonic emission from a monolayer of graphene grown on a Cu(111) surface was studied. The graphene exhibited strong and sharp excitonic emission peaks at approximately 3.16 and 3.18 eV with a full-width at half-maximum of 2.7 meV at 4.2 K. Carrier recombination parameters were determined through temperature-dependent and time-resolved photoluminescence, with carrier trapping and Auger recombination dominating the decay time as temperature increased.
NPJ 2D MATERIALS AND APPLICATIONS
(2021)
Article
Chemistry, Physical
Prachi Rastogi, Eva Izquierdo, Charlie Greboval, Mariarosa Cavallo, Audrey Chu, Tung Huu Dang, Adrien Khalili, Claire Abadie, Rodolphe Alchaar, Stefano Pierini, Herve Cruguel, Nadine Witkowski, James K. Utterback, Thibault Brule, Xiang Zhen Xu, Philippe Hollander, Abdelkarim Ouerghi, Bruno Gallas, Mathieu G. Silly, Emmanuel Lhuillier
Summary: Researchers have developed a new photodiode design that integrates nanocrystals into focal plane arrays, achieving efficient charge dissociation and low dark current. By introducing a thin and strongly coupled CdSe layer, the electrical performance of the diode is significantly improved.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Prachi Rastogi, Eva Izquierdo, Charlie Greboval, Mariarosa Cavallo, Audrey Chu, Tung Huu Dang, Adrien Khalili, Claire Abadie, Rodolphe Alchaar, Stefano Pierini, Herve Cruguel, Nadine Witkowski, James K. Utterback, Thibault Brule, Xiang Zhen Xu, Philippe Hollander, Abdelkarim Ouerghi, Bruno Gallas, Mathieu G. Silly, Emmanuel Lhuillier
Summary: This study improved the design of nanocrystal integration into focal plane arrays by introducing a CdSe layer, significantly enhancing the electrical performance and achieving high responsivity and specific detectivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Alexander Popert, Yuya Shimazaki, Martin Kroner, Kenji Watanabe, Takashi Taniguchi, Atac Imamoglu, Tomasz Smolenski
Summary: Graphene and its heterostructures have unique properties for studying strongly correlated electronic phases. However, the lack of a robust energy bandgap has limited optical access to these phases. This study demonstrates an all-optical spectroscopic tool using excited Rydberg excitons in an adjacent transition metal dichalcogenide monolayer to probe electronic correlations in graphene. The technique has submicron spatial resolution, circumventing spatial inhomogeneities and enabling optical studies of correlated states in optically inactive atomically thin materials.
Article
Chemistry, Physical
Tuan Khanh Chau, Dongseok Suh, Haeyong Kang
Summary: This study investigates the influence of individual grain boundaries (GBs) on the quantum Hall effect (QHE) in monolayer chemical vapor deposition (CVD) graphene. It finds that the scattering of GBs only affects the longitudinal resistance (R-xx) in the low carrier concentration region, while the standard QHE of monolayer graphene can be observed regardless of the stitching angle of the GB. Additionally, a controlled device with an added metal bar is introduced, showing that only R-xx is affected by nonzero resistance, while the Hall resistance (R-xy) exhibits well-quantized plateaus in the QH state.
Article
Chemistry, Physical
Yoann Prado, Junling Qu, Charlie Greboval, Corentin Dabard, Prachi Rastogi, Audrey Chu, Adrien Khalili, Xiang Zhen Xu, Christophe Delerue, Sandrine Ithurria, Emmanuel Lhuillier
Summary: In this study, a synthetic route via seeded growth is explored to obtain HgTe seeds with narrow and bright photoluminescence, leading to improved performance of infrared optoelectronics devices. Electronic transport tests on sphere-shaped HgTe NC arrays reveal enhanced mobility and stronger temperature dependence.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Xinyue Niu, Ying Yu, Jiadong Yao, Mengge Li, Jian Sha, Yewu Wang
Summary: In this study, black phosphorus quantum dots (BP QDs) were prepared and spin-coated onto monolayer MoS2 to fabricate hybrid BP QD/MoS2 photodetectors. The conductivity of MoS2 was significantly improved by the decoration of BP QDs, leading to a drastic increase in dark current. Additionally, the hybrid structure of BP QD/MoS2 exhibited a high photodetection responsivity under specific conditions, suggesting potential applications in phototransistors and photodetectors.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Ruibin Wang, Wenjie Su, Shilong Zhang, Linghua Jin, Jing Zhang, Huiyang Bian, Ye Zhang
Summary: Graphene quantum dots (GQDs) have attracted increasing attention for their unique physiochemical properties and potential applications. This study presents a universal approach to fabricate lignin-derived GQDs doped with various heteroatoms for use in photoelectrochemical-type photodetectors (PDs). The results show that these LGQDs have rich dopant chemistry and tunable broadband photoluminescence. Based on these advantages, the LGQDs-based PDs exhibit significant and fast photo-response in the visible region, as well as good long-term stability in a mild neutral environment, demonstrating their practical significance. This work opens up a new path for developing PDs using photochemically active species from sustainable and inexpensive biomass-derived lignin.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
David Sunghwan Lee, Jeong-Seob Yun, Jin Hyuck Heo, Bong Woo Kim, Sang Hyuk Im
Summary: The study demonstrates that graphene quantum dots embedded in metal halide perovskite films can reduce dark current, increase detectivity, and enhance response speed of photodetectors. This is attributed to the presence of graphene quantum dots throughout the bulk of the film, rather than just at the interface.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Nanoscience & Nanotechnology
Misook Min, Shambhavi Sakri, Gustavo A. Saenz, Anupama B. Kaul
Summary: The hybrid structure of zero-dimensional graphene quantum dots (GQDs) and semiconducting two-dimensional MoS2 exhibits outstanding properties for optoelectronic devices, surpassing the limitations of MoS2 photodetectors by extending optical absorption into the near-UV regime. The heterogeneous GQD/MoS2 photodetector shows high photoresponsivity and external quantum efficiency, making it promising for high-performance photodetectors, optoelectronic circuits, and quantum devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Review
Physics, Multidisciplinary
Chufan Zhang, Shannan Chang, Yaping Dan
Summary: This review provides an overview of the importance of ultrashallow doping in both classic field-effect transistors and quantum computing devices, and discusses three technologies for achieving ultrashallow doping. A research perspective for the future is also offered at the end of the review.
ADVANCES IN PHYSICS-X
(2021)
Article
Physics, Multidisciplinary
Chufan Zhang, Ke Li, Xiaoxian Zang, Fuyuan Ma, Yaping Dan
Summary: The study successfully fabricated dopant wires in silicon using a resist-free lithographic approach. By patterning dopant molecular monolayers into lines and driving the dopants into silicon by rapid thermal annealing, dopant wires were formed. If thermal diffusion of dopants can be mitigated, the dopant wires have the potential to be scaled down to the atomic scale.
CHINESE PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Xingyan Zhao, Kaiman Lin, Sai Gao, Huayou Liu, Jiajing He, Xiaoming Wang, Huimin Wen, Yaping Dan
Summary: Silicon-based infrared photodetectors have limited spectral bandwidth, but there are promising approaches being developed to extend their capabilities, such as Er/O doped silicon.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Multidisciplinary
Jiajing He, Huayou Liu, Chulin Huang, Yueyang Jia, Kai Li, Abdelmadjid Mesli, Rui Yang, Yongning He, Yaping Dan
Summary: This article investigates the transient photoresponses of nanowire photoconductors and concludes that despite having high gains, they will never outperform typical PIN photodiodes in terms of gain-bandwidth product.
Article
Engineering, Electrical & Electronic
Kai Li, Jiajing He, Wenyu Zhang, Huayou Liu, Yaping Dan
Summary: In this work, the explicit photogain theory was employed to study the physics in nanodevices at a single device level. By fitting the theory to experimental results, important device parameters were obtained, which are often difficult to calibrate using traditional techniques. The proposed technique is simple, nondestructive, and accurate enough for probing the physics in nanodevices.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Shannan Chang, Jiajing He, Slawomir Prucnal, Jieyin Zhang, Jianjun Zhang, Shengqiang Zhou, Manfred Helm, Yaping Dan
Summary: In this work, a delta-doping layer was formed in silicon by using flash lamp annealing to treat PCl3 monolayers grafted on silicon surfaces. The atomically thin (<1 nm) delta-doping layer exhibited a metallic state with a weak localization phenomenon, indicating the formation of a two-dimensional electron gas. By forming such an n-type delta-doping layer on a highly doped p-type Si substrate, a highly sensitive solar-blind UV photodetector was created.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Biochemical Research Methods
Roozbeh Abedini-Nassab, Zahra Aldaghi, Yaping Dan
Summary: This study focuses on the precise positioning of magnetic particles and magnetized cells in a microfluidic environment. By optimizing the geometry of capacitors, a magnetic particle transport platform was designed and demonstrated, showing efficient storage and transportation of particles and cells.
Article
Optics
Xiaobo Li, Xin Chen, Ning Wei, Chenduan Chen, Zhan Yang, Haijiao Xie, Jiajing He, Ningning Dong, Yaping Dan, Jun Wang
Summary: This study explores the wavelength-dependent and pulse-width-dependent nonlinear optical properties of liquid-phase exfoliated MoSSe nanosheets. The results show that the saturable absorption response of MoSSe nanosheets in the visible region is better than that in the near-infrared region, and the response under longer pulse excitation is better. Furthermore, a phase modulator integrated with a monolayer MoSSe into a silicon slot waveguide is designed and optimized to achieve high optical extinction. MoSSe exhibits satisfactory nonlinear optical properties and has excellent potential for applications in optoelectronic devices.
Article
Nanoscience & Nanotechnology
Shannan Chang, Chufan Zhang, Kai Li, Yaping Dan
Summary: Unintentional C-related contamination can negatively affect the electrical activity of dopants in self-assembled molecular monolayer doping. This paper introduces a low temperature oxidation method to remove carbon contamination before the rapid thermal annealing process, resulting in increased electrical activity of phosphorus.
Article
Materials Science, Multidisciplinary
Huan Liu, Ulrich Kentsch, Fangyu Yue, Abdelmadjid Mesli, Yaping Dan
Summary: Erbium-implanted silicon system shows low luminescence efficiency at room temperature, hindering its potential as electrically pumped light sources. In this article, a complete methodology was established to quantitatively describe the energy transfer processes from silicon to erbium. The study revealed important physical parameters such as energy transfer efficiency, PhotoLuminescence Quantum Yield, and optically active erbium concentration. The high defect density in the system was identified as the limiting factor for efficient erbium emission.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Huayou Liu, Yaping Dan
Summary: Low-dimensional photoconductors have high photogain, but the classical photogain theory is based on misplaced assumptions. We developed a new explicit photogain theory for silicon nanowires' photoresponses and validated it using Silvaco TCAD software. We studied the impact of surface states and fixed charges density on channel-continuous and channel-pinched-off nanowires.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Kai Li, Jie-Yin Zhang, Shannan Chang, Hao Wei, Jian-Jun Zhang, Yaping Dan
Summary: By using carbon-free phosphorus chloride (PCl3) molecules as dopant carrier molecules, carbon contamination can be avoided, and the dopant activation rate can be close to full activation, even for samples with low doping concentration.
ACS APPLIED ELECTRONIC MATERIALS
(2021)