Article
Nanoscience & Nanotechnology
Sriharsha Sudhindra, Farnia Rashvand, Dylan Wright, Zahra Barani, Aleksey D. Drozdov, Saba Baraghani, Claudia Backes, Fariborz Kargar, Alexander A. Balandin
Summary: The study revealed that increasing the size of graphene fillers enhances the thermal conductivity of composites, with fillers of 1200 nm lateral dimensions exhibiting lower thermal contact resistance. The effects of filler loading fraction and size on thermal conductivity were rationalized using the Kanari model. These findings are crucial for optimizing graphene fillers in thermal interface materials for efficient heat removal in high-power-density electronics.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Kazuya Uryu, Yuchen Deng, Son Phuong Le, Toshi-kazu Suzuki
Summary: The electron transport properties of n-GaN under an Ohmic-metal were investigated. Experimental results showed that after Ohmic-metal treatment, the electron concentration in n-GaN increased and the electron mobility enhanced. This enhancement could not be explained by ionized impurity scattering, but was attributed to polarization doping caused by the strain from the Ohmic-metal. These findings are important for understanding the electron transport properties of n-GaN.
Article
Nanoscience & Nanotechnology
Sungwon Lee, Hyungyu Choi, Inyong Moon, Hoseong Shin, Kenji Watanabe, Takashi Taniguchi, Won Jong Yoo
Summary: This study demonstrates that edge-contacted graphene devices of multiple stacked 2D hetero-structures with hBN exhibit superior performances in carrier transport and have lower contact resistivity compared to surface-contacted devices.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Yaodong Liu, Jing Xu, Jianfeng Gao, Jinbiao Liu, Dan Zhang, Xuebing Zhou, Xianglie Sun, Yongliang Li, Junfeng Li, Chao Zhao, Wenwu Wang, Dapeng Chen, Tianchun Ye, Jun Luo
Summary: This study systematically investigated the thermal stability issue of ultrathin TiSix in DRAM peripheral 3D FinFET transistors. The specific contact resistivity of TiSix/n(+)-Si contacts degrades with increasing annealing temperature. Agglomeration of ultrathin TiSix in the source/drain regions still occurs after DRAM annealing at 750 degrees C, leading to deterioration of the contact resistivity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Nanoscience & Nanotechnology
Jong-Hwan Lee, Jaekwang Song, Dong Heon Shin, Seoungwoong Park, Hwa Rang Kim, Sung-Pyo Cho, Byung Hee Hong
Summary: The study introduces a method to reduce contact resistance between Mo and MoS2 by in situ sulfurization of Mo using H2S gas treatment masked by a patterned graphene gas barrier, resulting in a gradual edge contact between the two materials. This approach significantly enhances the electrical performance of field-effect transistors compared to devices with top contacts, ultimately improving the overall device characteristics.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Sim-Hoon Yuk, Vallivedu Janardhanam, Kyu-Hwan Shim, Chel-Jong Choi
Summary: In this study, the microstructural and electrical characteristics of Pt contacts to n-type InGaAs were investigated at various rapid thermal annealing (RTA) temperatures. RTA at 500 ?C led to the formation of a PtAs2 phase, while annealing at 600 ?C resulted in complete consumption of the Pt films and the formation of multiple distinguishable phases.
Article
Nanoscience & Nanotechnology
Sungjoo Song, Seung-Hwan Kim, Kyu-Hyun Han, Hyung-jun Kim, Hyun-Yong Yu
Summary: This paper demonstrates the effectiveness of a metal/graphene/semiconductor (MGrS) contact structure as a universal source/drain contact for both n- and p-type transistors. The MGrS contact structure enhances the reverse current density and reduces the Schottky barrier height for both semiconductor types. Graphene effectively alleviates Fermi level pinning and modulates the work function of the contact metal, resulting in excellent Ohmic contacts in both n- and p-type Si.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Bin Wang, Mohammad Wasil Malik, Yiyi Yan, Valeriya Kilchytska, Yun Zeng, Denis Flandre, Jean-Pierre Raskin
Summary: This study investigates the contact resistance between Ti and graphene, proposing a new model to evaluate the factors controlling the resistance value. Factors such as oxidized Ti layer or polymer residues at the Ti-graphene interface influence carrier transmission probability. The research helps in improving metal-graphene contact for future applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Chemistry, Physical
Seunghun Baik, Heejae Jeong, Geuntae Park, Hongki Kang, Jae Eun Jang, Hyuk-Jun Kwon
Summary: This study introduced a laser activation process (LAP) to improve the electrical performance of n-type Germanium (Ge) devices. The LAP effectively activated the dopants and created a shallow junction in Ge. The study also investigated a triple contact structure of Titanium (Ti)/Nickel (Ni) nano-islands/Ge to reduce contact resistance and enhance tunneling current.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Fangzhu Xiong, Jie Sun, Penghao Tang, Weiling Guo, Yibo Dong, Zaifa Du, Shiwei Feng, Xuan Li
Summary: This article introduces a technique for the direct growth of graphene on GaN LED epitaxy layers. The technique synthesizes high-quality graphene at low temperature and time, and enables lithography-free patterning of graphene. In-situ Ohmic contact is achieved between graphene and p-GaN by removing the catalyst using a penetration etching method. Graphene exhibits excellent performance and is more scalable, controllable, and compatible with the semiconductor industry than traditionally transferred graphene.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Energy & Fuels
Nils Folchert, Rolf Brendel
Summary: This study reviewed the application of the Cox & Strack equation in contact resistance measurements, proposed a new model extension approach, and compared the results with rigorous finite-element simulations, showing relative agreement with slight variations based on sample geometry and resistance values.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Energy & Fuels
Leo Basset, Wilfried Favre, Olivier Bonino, Julien Sudre, Gilles Menard, Jean-Pierre Vilcot
Summary: The influence of light on the contact resistivity of the electron and hole contacts of a silicon heterojunction cell was studied using the transfer length method. Results showed that measurements are more accurate in darkness and at high injection levels. Careful attention to passivation properties is needed when fabricating TLM samples.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Chemistry, Multidisciplinary
Yuji Araki, Pablo Solis-Fernandez, Yung-Chang Lin, Amane Motoyama, Kenji Kawahara, Mina Maruyama, Yanlin Gao, Rika Matsumoto, Kazu Suenaga, Susumu Okada, Hiroki Ago
Summary: This study investigates the twist angle dependence of intercalation of metal chlorides in bilayer graphene (BLG). It is found that high twist angle BLG is more favorable for intercalation due to weaker interlayer coupling. Scanning transmission electron microscope observations reveal the formation of various 2D structures through co-intercalation of AlCl3 and CuCl2 molecules. Moreover, high twist angle BLG exhibits lower sheet resistance before intercalation and intercalation further decreases the sheet resistance.
Article
Mechanics
Yang Wang, Kangmin Niu, Ying Wu
Summary: The development of a coarse-grained graphene model and corresponding potential was systematically conducted, with the study demonstrating its robustness through comparison analysis and compatibility with a copper/graphene nanocomposite from tensile tests. The model successfully reproduced the architectural parameters, elastic, fracture, and interlayer adhesion properties of graphene sheets, serving as an effective strategy for researching hybrid composite systems.
COMPOSITE STRUCTURES
(2021)
Article
Energy & Fuels
Senami Zogbo, Wilfried Favre, Olivier Bonino, Marie-Estelle Gueunier-Farret
Summary: Measuring specific contact resistivity (pc) is crucial for interface engineering in high efficiency solar cells. The Transfer Length Method (TLM) is commonly used for evaluating layer sheet resistance (Rsheet) and pc, but it is not suitable for metal/Transparent Conductive Oxide (TCO) interface evaluation in silicon heterojunction (SHJ) cells. This study investigates the parameters that restrict current confinement within the TCO, including mid-gap trap density (Dit) at the a-Si:H/c-Si interface and the activation energy (Ea = Ec - EF) variation of a-Si:H contact layers.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2024)
Article
Chemistry, Physical
Jie Sheng, Jingshan He, Dun Ma, Yuanbo Wang, Wu Shao, Tian Ding, Ronghao Cen, Jingwen He, Zhihao Deng, Wenjun Wu
Summary: This study presents an innovative approach to improve the photovoltaic conversion characteristics and stability of perovskite solar cells through carbon electrode interface modification. By in-situ polymerization and carbonization on the surface of nano-graphite, a dendritic structure carbon electrode is formed, reducing the work function and aligning the energy levels with perovskite. This leads to improved charge and hole collection efficiency, resulting in increased photovoltaic conversion efficiency. Furthermore, the modified carbon electrode-based perovskite solar cells exhibit exceptional stability, maintaining high efficiency even without encapsulation.
Article
Chemistry, Physical
Guodong Shi, Jian Song, Xiaoxiao Tian, Tongtong Liu, Zhanjun Wu
Summary: This study demonstrates the improvement of mechanical properties and reduction of coefficient of thermal expansion (CTE) in graphene oxide (GO)/epoxy (EP) nanocomposites by enhancing the interface between GO and EP through functionalization and incorporating rigid-flexible interphases. The results reveal that the SiO2-PEA-GO hybrid exhibits better strengthening and toughening effects, as well as lower CTE, compared to the PEA-GO hybrid due to the presence of rigid-flexible interfaces with higher bonding strength and better energy dissipation mechanisms. Additionally, the nanocomposites with longer polyetheramine (PEA) molecules in the rigid-flexible interphases demonstrate higher strength and toughness, while maintaining a lower CTE. This work provides a promising strategy for constructing adjustable flexible-rigid interfacial structures and offers potential in developing GO/EP nanocomposites with high mechanical properties and low CTE.
Article
Chemistry, Physical
Rafal Janus, Sebastian Jarczewski, Jacek Jagiello, Piotr Natkanski, Mariusz Wadrzyk, Marek Lewandowski, Marek Michalik, Piotr Kustrowski
Summary: In this study, a facile procedure for the synthesis of CMK-1 and CMK-2 carbon replicas was developed. The method utilizes basic laboratory equipment and a renewable carbon source, and operates under mild conditions. The resulting carbon mesostructures exhibit exquisite replication fidelity and structural homogeneity, making them suitable for applications in various fields.
Article
Chemistry, Physical
Anqi Wang, Connor J. MacRobbie, Alex Baranovsky, Jean-Pierre Hickey, John Z. Wen
Summary: In this study, a novel polymer-free nanothermite aerogel with a wide range of nanoparticle loading was fabricated via a new additive manufacturing process. The SEM images showed a unique porous structure formed by extra thin rGO sheets, wrapping individual nanothermite clusters. The DSC-TGA results and high-speed combustion videos confirmed the enhanced energetic performance of the printed specimen.
Article
Chemistry, Physical
Wanze Wu, Misheng Zhao, Shiwei Miao, Xiaoyan Li, Yongzhong Wu, Xiao Gong, Hangxiang Wang
Summary: Superhydrophobic solar-driven interfacial evaporator is an energy-efficient technology for seawater desalination, which is easily fabricated using robust photothermal superhydrophobic coating and substrate. The created bifunctional coating on the melamine sponge substrate shows stable and highly efficient photothermal and superhydrophobic performance for seawater desalination. This superhydrophobic solar-driven interfacial evaporator is expected to have wide applications in seawater desalination.
Article
Chemistry, Physical
Zichen Xiang, Zhi Song, Tiansheng Wang, Menghang Feng, Yijing Zhao, Qitu Zhang, Yi Hou, Lixi Wang
Summary: This study presents a co-electrospinning synthesis strategy to fabricate lightweight and porous Co@C composite nanofibres with wideband microwave attenuation capacity. The addition of MOF-derived Co additives enhances the low-frequency absorption performance.
Article
Chemistry, Physical
J. Snow, C. Olson, E. Torres, K. Shirley, E. Cazalas
Summary: This study investigates the use of a perovskite-based graphene field effect transistor (P-GFET) device for X-ray detection. The sensitivity and responsivity of the device were found to be influenced by factors such as X-ray tube voltage, current, and source-drain voltage. Simulation experiments were conducted to determine the dose rate and energy incident on the device during irradiation.
Article
Chemistry, Physical
Zuzana Jankovska, Lenka Matejova, Jonas Tokarsky, Pavlina Peikertova, Milan Dopita, Karolina Gorzolkova, Dominika Habermannova, Michal Vastyl, Jakub Belik
Summary: This study provides new insights into microwave-assisted pyrolysis of scrap tyres, demonstrating that it can produce microporous carbon black with potential application in xylene adsorption. Compared to conventional pyrolysis, microwave pyrolysis requires less time and energy while maintaining similar adsorption capacity.
Article
Chemistry, Physical
Max Bommert, Bruno Schuler, Carlo A. Pignedoli, Roland Widmer, Oliver Groning
Summary: A detailed understanding of the interaction between molecules and two-dimensional materials is crucial for incorporating functional molecular films into next-generation 2D material-organic hybrid devices. This study compares the energy level alignment of different-sized fullerenes on a Moire superstructure and finds that C-84 fullerenes can be either neutral or negatively charged depending on slight variations of the electrostatic potential. This discovery suggests a new path to achieve ambipolar charge transfer without overcoming the electronic gap of fullerenes.
Article
Chemistry, Physical
Yuanjing Cheng, Xianxian Sun, Ye Yuan, Shuang Yang, Yuanhao Ning, Dan Wang, Weilong Yin, Yibin Li
Summary: The dual-structure aerogel (GS) consisting of flexible silica fibers and graphene honeycomb structures exhibits excellent resilience, flexibility, and reliability. It also shows remarkable wave absorbing performance, making it an ideal candidate for microwave absorption applications such as flexible electronics and aerospace.
Article
Chemistry, Physical
Shuyu Fan, Yinong Chen, Shu Xiao, Kejun Shi, Xinyu Meng, Songsheng Lin, Fenghua Su, Yifan Su, Paul K. Chu
Summary: Graphene coatings are promising solid lubrication materials due to their mechanical properties. This study presents a new method for in situ deposition of high-quality graphene coatings on hard substrates using NiCo solid solution and competitive reaction strategies. The graphene coating deposited on substrates with deep NiCo solid solution demonstrates superior low-friction and durability.
Article
Chemistry, Physical
Mengdi Wang, Sanyin Qu, Yanling Chen, Qin Yao, Lidong Chen
Summary: The improved thermoelectric properties of conducting polymers are achieved by selectively capturing single-walled carbon nanotubes (SWNTs) in a conducting polymer film, leading to increased carrier mobility and reduced thermal conductivity. The resulting composite film exhibits significantly higher electrical conductivity and lower thermal conductivity compared to films with a mixture of SWNTs. This work provides a convenient and efficient method to enhance the thermoelectric properties of conducting polymers.
Review
Chemistry, Physical
Heng Wei, Weihua Li, Kareem Bachagha
Summary: This article reviews the research progress of carbon nanotube-based microwave absorbing materials (MAMs) in recent years, covering the fundamental theory, design strategies, synthesis methods, and future development directions.
Article
Chemistry, Physical
Chenguang Shi, Junlong Huang, Zongheng Cen, Tan Yi, Shaohong Liu, Ruowen Fu
Summary: This study developed a high-performance Li metal host material, which achieved dendrite-free Li deposition with a low nucleation overpotential and high Coulombic efficiencies through the combination of Ti3C2-g-PV4P sheets and Ag nanoparticles. The full cells assembled with the Li@host anode and LiFePO4 cathode exhibited high discharge capacity and excellent cycling stability, demonstrating a perspective design for future energy storage devices.
Article
Chemistry, Physical
Tomotaro Mae, Kentaro Kaneko, Hiroki Sakurai, Suguru Noda
Summary: A new partial prelithiation method for SiO/C-CNT electrodes was developed, which showed reduced irreversible capacity and achieved high energy densities with good reversibility. The method allows for precise control of the degree of prelithiation and is applicable to various chemistries.