Article
Chemistry, Applied
Kamarajar Prakash, Santhanakrishnan Harish, Shanmugasundaram Kamalakannan, Thirumalaisamy Logu, Masaru Shimomura, Jayaram Archana, Mani Navaneethan
Summary: This article investigates the doping effects on two-dimensional Molybdenum Sulphide (MoS2) to improve conductivity and efficiency. Different weight percentages (2%, 4%, 6%, 8%, 10%) of Nickel (Ni) were doped into the MoS2 matrix using a simple hydrothermal technique, and their effects were studied using physio-chemical analyses. The results show that Ni-doped MoS2 nanosheets exhibit enhanced interlayer spacing and the 6% Ni-doped MoS2 electrode material shows better electrochemical performance.
JOURNAL OF ENERGY CHEMISTRY
(2023)
Review
Engineering, Electrical & Electronic
Jakub Jadwiszczak, Daniel J. Kelly, Junqing Guo, Yangbo Zhou, Hongzhou Zhang
Summary: The incorporation of 2D semiconductors into future electronic devices requires large-scale and cost-effective doping and chemical control methods. Plasma processing has emerged as a promising solution, but challenges remain in fine-tuning the chemical functionalization of 2D materials.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Physical
Sile Chen, Tao Cheng, Zhaoquan Chen, Xingyu Chen, Guan-Jun Zhang
Summary: Surface fluorination by low-temperature plasma treatment can enhance the surface electrical strength of insulating materials. The performance of modified materials is influenced by operation parameters, leading to different physical and chemical changes on the surface properties. Adjusting plasma exposure time, applied voltage, and CF4 volume fraction can affect the multi-effects caused by the various processes in the interface between plasma and material surface.
APPLIED SURFACE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Fang Li, Mingxing Chen, Yajuan Wang, Xiaoli Zhu, Xuehong Zhang, Zixing Zou, Danliang Zhang, Jiali Yi, Ziwei Li, Dong Li, Anlian Pan
Summary: The controlled synthesis of high-quality ultrathin h-GaTe/MoS2 heterostructures on MoS2 substrate has led to the design of optoelectronic devices with remarkable photoresponsivity and fast photoresponse speed. This study provides insights into the controlled growth of relevant materials and suggests promising applications in future integrated electronic and optoelectronic devices and systems.
Article
Nanoscience & Nanotechnology
Heesoo Lee, Hoijoon Kim, Kihyun Kim, Kwangsik Jeong, Mirine Leem, Seunghyun Park, Jieun Kang, Geunyoung Yeom, Hyoungsub Kim
Summary: This study developed a three-dimensional and damage-free surface treatment method for two-dimensional transition metal dichalcogenide semiconductors, and successfully achieved uniform atomic layer-deposition of a high-k dielectric film. The results demonstrate the potential application of this method in realizing next-generation gate-all-around field-effect transistors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Dhirendra Sahoo, Jyoti Shakya, Nasir Ali, Won Jong Yoo, Bhaskar Kaviraj
Summary: This study investigates the photocatalytic performance of MoS2 nanoflowers synthesized using a hydrothermal method for dye degradation under visible light irradiation. The ultrathin-layered nanoflowers showed faster degradation rates and good stability, indicating their potential as effective catalysts for industrial wastewater treatment.
Article
Engineering, Electrical & Electronic
Shixiang Zuo, Xiaoman Cao, Peijun Wang, Xiazhang Li, Wenjie Liu, Rong Xu, Chao Yao, Yongsheng Fu, Xiaoheng Liu
Summary: In this study, MoS2/C-mica composites were prepared by introducing C-mica as a carrier, effectively suppressing the curvature and agglomeration of MoS2, thus enhancing the separation effect of photo-generated electron-hole pairs and photocatalytic ability. The resulting product exhibited outstanding visible photocatalytic activity and reusability for tetracycline hydrochloride, with a degradation rate of 90.6% after 60 minutes of irradiation. H(+) and center dot O(2-) radicals played important roles as the main active sites during the photocatalytic degradation process.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Physical
D. Praveen Kumar, Sumin Seo, A. Putta Rangappa, Seunghee Kim, K. Arun Joshi Reddy, Madhusudana Gopannagari, P. Bhavani, D. Amaranatha Reddy, Tae Kyu Kim
Summary: The use of non-precious and noble-metal free catalysts for water photo conversion into hydrogen is of significant interest, and the doping of a foreign metal into the MoS2 system has been found to be an effective method for enhancing the hydrogen production rate. In this study, CdS nanorods are decorated with zinc-doped MoS2 nanosheets, and the resulting composite shows excellent photocatalytic activity for hydrogen evolution. The loading of Zn-MoS2 enhances the synergistic effects of the photocatalyst and improves the stability of the material. This Zn-MoS2/CdS composite is believed to have great potential as a low-cost, highly-efficient catalyst for the photocatalytic reduction of water.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Jiahao Wu, Shasha Li, Ximiao Wang, Yuan Huang, Yifeng Huang, Huanjun Chen, Jun Chen, Juncong She, Shaozhi Deng
Summary: This article presents a method for constructing room-temperature mid-infrared photodetectors using oxygen plasma-treated few-layer MoS2. By introducing electronic states in the band gap of MoS2 through oxygen substitution, the photodetectors achieve high responsivity and detectivity for mid-infrared light at room temperature.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Jibin Fan, Yimeng Shi, Hongxia Liu, Shulong Wang, Lijun Luan, Li Duan, Yan Zhang, Xing Wei
Summary: This study investigates the atomic layer deposition growth of La2O3/Al2O3 nanolaminates on MoS2 using different oxidants and treatment processes. It is found that ultraviolet ozone pretreatment can improve the deposition and reduce residual metal carbide, resulting in good electrical performance.
Article
Materials Science, Characterization & Testing
Veronica Luque-Agudo, Margarita Hierro-Oliva, Amparo M. Gallardo-Moreno, M. Luisa Gonzalez-Martin
Summary: Plasma treatment is commonly used to modify the surface properties of polymeric materials, but the effects may not be long-lasting. A study on PLA films deposited on titanium showed that argon plasma treatment led to more significant chemical changes, with increased polymer chain fragmentation and crosslinking, resulting in a more hydrophilic surface.
Article
Materials Science, Multidisciplinary
Kailin Yang, Zhao Xu, Runlai Li, Yang Liu, Weilong Sun, Yong Tang, Xiangyang Liu, Qiang Fu
Summary: This study surface modified an ultrathin ultra-high molecular weight polyethylene (UHMWPE) membrane through direct fluorination and plasma treatments, resulting in a notable suppression in crystallinity and significant changes in the multiscale structure.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2023)
Article
Polymer Science
Veronica Satulu, Valentina Dinca, Mihaela Bacalum, Cosmin Mustaciosu, Bogdana Mitu, Gheorghe Dinescu
Summary: This study investigates the use of plasma treatment to control cell behavior on polymer surfaces. The results show that plasma treatment increases cell viability and attachment, while also speeding up the cell detachment process. This demonstrates the potential of plasma treatment for improving cell attachment and detachment in tissue engineering.
Article
Engineering, Electrical & Electronic
Zhao Li, Lu Liu, Jing-Ping Xu
Summary: Reasonable-power O-2-plasma treatment can repair structural defects in MoS2 and enhance electrical performance, while high-power O-2 plasma treatment may introduce more defects and deteriorate the performance of MoS2 devices.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Materials Science, Multidisciplinary
Shiqi Guo, Kaijin Wu, Chengpan Li, Hao Wang, Zheng Sun, Dawei Xi, Sheng Zhang, Weiping Ding, Mona E. Zaghloul, Changning Wang, Fernando A. Castro, Dong Yang, Yunlong Zhao
Summary: Smart contact lenses with a flexible fabrication method and ultrathin MoS2 transistor-based serpentine mesh sensor system have been developed, integrating photodetector, glucose sensor, and temperature sensor for high sensitivity and biocompatibility, showing promise for healthcare and medical applications.
Review
Chemistry, Multidisciplinary
Xiaochi Liu, Min Sup Choi, Euyheon Hwang, Won Jong Yoo, Jian Sun
Summary: This article discusses the impact of Fermi level pinning (FLP) in 2D semiconductor devices and its causes. The authors indicate that FLP is mainly due to inefficient doping into 2D materials, vdW gap at the metal interface, and hybridized compounds formed under contacting metals. The article further explores the effects of FLP on 2D device performance and methods for improving metallic contact to 2D materials.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Dhirendra Sahoo, Jyoti Shakya, Nasir Ali, Won Jong Yoo, Bhaskar Kaviraj
Summary: This study investigates the photocatalytic performance of MoS2 nanoflowers synthesized using a hydrothermal method for dye degradation under visible light irradiation. The ultrathin-layered nanoflowers showed faster degradation rates and good stability, indicating their potential as effective catalysts for industrial wastewater treatment.
Article
Physics, Applied
Zhongwang Wang, Xiaochi Liu, Huixia Lei, Yang Lu, Yahua Yuan, Yuanyuan Qu, Yifan Huang, Hiroshi Mizuta, Won Jong Yoo, Jian Sun
Summary: A comprehensive electrical modulation of conductance anisotropy in low-symmetry ReS2 transistors is reported. By applying a gate voltage, the polarization direction of the maximum conductance can be reversed, achieving a comprehensive modulation of conductance anisotropy. This modulation provides an additional degree of freedom for exploring functionalities in low-symmetry semiconductors.
PHYSICAL REVIEW APPLIED
(2022)
Article
Nanoscience & Nanotechnology
Fida Ali, Nasir Ali, Muhammad Taqi, Tien Dat Ngo, Myeongjin Lee, Hyungyu Choi, Won-Kyu Park, Euyheon Hwang, Won Jong Yoo
Summary: This study systematically analyzed the metal-insulator transition (MIT) occurring in WSe2 devices by varying the thickness of the WSe2. The nature of the MIT strongly depends on the WSe2 channel thickness and the strength of the localized trap density (D-t) at the interface.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Tien Dat Ngo, Min Sup Choi, Myeongjin Lee, Fida Ali, Yasir Hassan, Nasir Ali, Song Liu, Changgu Lee, James Hone, Won Jong Yoo
Summary: This study presents a simple method to selectively pattern degenerately p-type-doped WSe2 FETs through electron beam irradiation, achieving the OFF state of the devices. The threshold voltage of the devices can be accurately controlled by varying the pattern size and e-beam dose, while maintaining low contact resistance. High-performance WSe2 p-FETs are achieved by using hBN as the gate dielectric.
Article
Chemistry, Multidisciplinary
Hai Yen Le Thi, Tien Dat Ngo, Nhat Anh Nguyen Phan, Won Jong Yoo, Kenji Watanabe, Takashi Taniguchi, Nobuyuki Aoki, Jonathan P. Bird, Gil-Ho Kim
Summary: In this study, a lateral p-n junction diode is fabricated in tungsten diselenide, showing high on/off ratio, mobility, and stability.
Article
Chemistry, Multidisciplinary
Hoseong Shin, Muhammad Taqi, Fida Ali, Sungwon Lee, Min Sup Choi, Cihyun Kim, Byoung-Hun Lee, Xiaochi Liu, Jian Sun, Byungdu Oh, Won Jong Yoo
Summary: 2D transition metal dichalcogenides (TMDCs) are promising materials for future nano-sized photodevices due to their electronic and optoelectronic properties. In this study, an oxygen plasma-doped WSe2/pristine MoS2-based photodetector with high responsivity and broad detection spectrum is reported. The devices exhibit enhanced photoresponsivity and specific detectivity without an external bias, indicating their potential as highly sensitive and self-powered photodetectors.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Yang Liu, Song Liu, Zhiying Wang, Baichang Li, Kenji Watanabe, Takashi Taniguchi, Won Jong Yoo, James Hone
Summary: Researchers have discovered a method for embedding metal contacts within hexagonal boron nitride and transferring them onto transition metal dichalcogenide monolayers. This method reduces doping, strain, and interfacial roughness, allowing for the fabrication of high-quality metal contacts.
NATURE ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Zhenping Wang, Nasir Ali, Fida Ali, Hyungyu Choi, Hoseong Shin, Won Jong Yoo
Summary: This study investigates the trap states induced by Se vacancies and their influence on hopping transport in PdSe2. The results show that trap states in few-layer PdSe2 are more temperature-dependent, while those in multilayer PdSe2 show no significant temperature dependence. The electron mobility is higher in multilayer PdSe2, possibly due to the decreased effective mass and suppression of charge impurity scattering. The hopping transport mechanism is strongly associated with the Se vacancy-induced localized states with poor screening and strong potential fluctuations.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Kwangro Lee, Tien Dat Ngo, Sungwon Lee, Hoseong Shin, Min Sup Choi, James Hone, Won Jong Yoo
Summary: Recently, researchers have been studying 2D materials for their unique nanoelectronic applications. Among these materials, tungsten diselenide (WSe2) has attracted significant interest due to its favorable properties. This study proposes a simple method involving oxygen plasma treatment and aging to overcome an issue called Fermi-level pinning (FLP) in WSe2 field-effect transistors (FETs). The results show a reduction in FLP and improved performance in the FETs after aging, along with changes in the metal contacts used. This work demonstrates an efficient approach to addressing FLP and modulating the performance of 2D FETs.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Nasir Ali, Myeongjin Lee, Fida Ali, Hoseong Shin, Tien Dat Ngo, Kenji Watanabe, Takashi Taniguchi, Byungdu Oh, Won Jong Yoo
Summary: This study reports the metal-insulator transition (MIT) phenomenon in devices based on black phosphorus (BP) nanosheets, and elucidates the microscopic origin of 2D transition through analysis under two different conditions. The study finds that carrier-carrier interactions dominate over disorder in devices encapsulated with hBN, while disorder plays a significant role in unencapsulated devices. These findings pave the way for studying the 2D MIT and various classical and quantum transports in 2D nanoelectronic devices using BP with and without hBN encapsulation.
ACS APPLIED NANO MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Nasir Ali, Myeongjin Lee, Fida Ali, Tien Dat Ngo, Hyokwang Park, Hoseong Shin, Won Jong Yoo
Summary: By tuning the carrier density controlled by back-gate bias, we observed the metal-insulator transition (MIT) in black phosphorus field effect transistors. At high carrier densities, the conductivity follows a power-law dependence on carrier density, indicating the presence of screened Coulomb impurity scattering. As the carrier density decreases, the screening of Coulomb impurity scattering breaks down, leading to strong charge density inhomogeneity and a percolation-based transition at the critical carrier density. Our findings confirm the 2D percolation-based MIT in black phosphorous devices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zhenping Wang, Nasir Ali, Tien Dat Ngo, Hoseong Shin, Sungwon Lee, Won Jong Yoo
Summary: High-mobility field-effect transistors (FETs) are achieved by introducing few-layer PdSe2 flakes as channels and directly depositing semimetal antimony (Sb) as drain-source electrodes. The formation of clean and defect-free van der Waals (vdW) stackings at the Sb-PdSe2 heterointerfaces boosts the transport characteristics, while the use of layered h-BN as buffer layers eliminates interfacial disorders and significantly increases electron mobility.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Dhirendra Sahoo, Shivam Tyagi, Srishti Agarwal, Jyoti Shakya, Nasir Ali, Won Jong Yoo, Bhaskar Kaviraj
Summary: This study found that Mn-doped MoS2 nanostructures exhibit exceptional visible-light-driven photocatalytic activity, with high efficiency in the degradation of organic dyes. Furthermore, the catalysts doped with Mn showed good stability even after multiple cycles of use. Therefore, these nanostructures have the potential to be used as catalysts for industrial wastewater treatment.
Article
Chemistry, Multidisciplinary
Tien Dat Ngo, Tuyen Huynh, Hanggyo Jung, Fida Ali, Jongwook Jeon, Min Sup Choi, Won Jong Yoo
Summary: Achieving low contact resistance (R-C) is a major challenge in producing 2D FETs. In this work, the electrical characteristics of semimetal and normal metal-contacted MoS2 devices are analyzed. Semimetal contacts significantly reduce R-C and have a strong dependence on top gate-voltage (V-TG), while normal metal contacts only modulate R-C by varying bottom gate-voltage (V-BG). The anomalous behavior is attributed to weak Fermi level pinning (FLP) of semimetal contacts.
