Article
Nanoscience & Nanotechnology
Yangjiang Wu, Zhihui Wang, Longfei Yang, Yanjun Qiao, Dongdong Chang, Yongkun Yan, Zeng Wu, Zhijun Hu, Jichao Zhang, Xuefeng Lu, Yan Zhao, Yunqi Liu
Summary: This study reveals that using a ferroelectric polymer as a dielectric interfacial layer in organic field-effect transistors can constrain traps within a shallow energy level. Furthermore, the decrease in shallow traps is proportional to the increase in deep traps, indicating a transition between shallow and deep traps in the semiconducting channel.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Jesus Canas, Daniel F. Reyes, Alter Zakhtser, Christian Dussarrat, Takashi Teramoto, Marina Gutierrez, Etienne Gheeraert
Summary: The synthesis development of silicon oxide atomic layer deposition has opened the possibility of using it as a dielectric material in diamond electronics. The study of the heterojunction between deposited silicon oxide and oxygen-terminated diamond has provided insights into the properties and interface of the materials.
Article
Chemistry, Physical
Xinhui Zou, Chao Ma, Christopher C. S. Chan, Jianquan Zhang, Yunke Li, Ao Shang, Zhen Wang, Lingeswaran Arunagiri, Zhenyu Qi, Harald Ade, He Yan, Kam Sing Wong, Philip C. Y. Chow
Summary: This study investigates charge dynamics in three model non-fullerene systems with varying energy offsets using optical spectroscopy. Systems with small or negative energy offsets show low photocurrent generation yields and significant radiative recombination. Improved photocurrent generation and suppressed exciton emission are observed under reverse bias, indicating that external electric fields facilitate separation of bound charge pairs at the donor/acceptor interface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Kecheng Long, Shaozhen Huang, Han Wang, Zhaoqing Jin, Anbang Wang, Zhongming Wang, Piao Qing, Zhijian Liu, Libao Chen, Lin Mei, Weikun Wang
Summary: In this study, an interfacial capacitance mechanistic model is established to explain the function of lithiophilic porous siloxene framework on lithium metal. The model demonstrates that the lithiophilic porous siloxene framework can increase interfacial capacitance and greatly reduce electrochemical polarization. Additionally, this framework can act as a stable interfacial skeleton to homogenize lithium deposition. When coupled with LiCoO2, the resulting lithium-ion battery exhibits 80% capacity retention after 145 cycles at 0.5 C. Furthermore, a 1.6 Ah lithium-ion battery with this framework achieves 80% capacity retention after 66 cycles at 0.2 C. This interfacial capacitance mechanistic model deepens and advances the theory of lithium affinity, providing guidance for practical lithium metal anode design.
ENERGY STORAGE MATERIALS
(2023)
Article
Engineering, Environmental
Pan Wu, Xuan Wu, Huimin Yu, Jingyuan Zhao, Yida Wang, Kewu Pi, Gary Owens, Haolan Xu
Summary: This study addresses the global shortages in clean water, agricultural land resources, and food supply by developing a self-sustaining and solar-driven offshore double-layered sea farm system.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
S. Meenakshi, R. Saravanan, N. Srinivasan, D. Dhayanithi, Nambi Venkatesan Giridharan
Summary: The magneto-electric ceramic composite of (1-x)BaTiO3 + xZnFe(2)O(4) (x = 0.2, 0.4, 0.6, 0.8) was synthesized by solid state method, displaying complex electrical and magnetic properties. As the ferrite content increased, the composite transitioned from lossy capacitance to resistive capacitance, with an increase in dielectric constant but also dielectric loss. The Ti-O bond played a significant role in the electrical characterization, while the composite exhibited small ferromagnetic properties, with saturation magnetization increasing with ferrite content.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Irum Firdous, Muhammad Fahim, Walid A. Daoud
Summary: Enhancing negative charge retention sites and preventing alternate charge transfer are crucial for improving the performance of triboelectric nanogenerators. Doping PVDF with phytate ion cluster as the tribopositive layer and optimizing the tribonegative layer with deeper trap states and more localization of negative charge (i.e. PDMS) contribute to trapping charges effectively and increasing current density.
Article
Physics, Applied
Vibhuti Chauhan, Dip Prakash Samajdar
Summary: Negative-capacitance fin field-effect transistors (NC-FinFETs) have become a key technology among conventional devices due to their superior gate electrostatics and dominance over short channel effects (SCEs). In this study, a novel buried oxide strategy for the NC-FinFET architecture was proposed, altering the depth of the interfacial gate oxide (IGO) layer inside the channel. Comparative analysis of the DC, mixed-mode, and SCE parameters was performed to realize the optimized depth, and the tolerable degradation in circuit characteristics with varying buried IGO (BIGO) depth was presented.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Yuyan Wang, Rui Shu, Xinxing Zhang
Summary: An ultratough nanocomposite laminate is prepared by constructing chain-sliding cross-linking at the interface between sulfonated graphene nanosheets and polyurethane layers, enabling interfacial molecular chains reversible slippage when the inorganic nanosheets bear stretching force. The resulting laminates exhibit strong strength, supertoughness, ultrahigh stretchability, and self-healing ability, surpassing most of reported synthetic and natural laminate materials. The fabricated proof-of-concept electronic skin shows excellent flexibility, sensitivity, and healability for human physiological signals monitoring. This strategy breaks through the challenge that traditional layered nanocomposites are intrinsically stiff and opens up the functional application of layered nanocomposites in flexible devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Pengfei Shen, Pei Yin, Yongtao Zou, Mu Li, Nanqiu Zhang, Dan Tan, Haiyang Zhao, Quanjun Li, Rusen Yang, Bo Zou, Bingbing Liu
Summary: The catalytic activity of 2D materials has been studied and their unique structural and electronic properties contribute to their success in conventional heterogeneous catalysis. Piezocatalysis based on heterojunctions has attracted attention because of band-structure engineering and enhanced charge carrier separation. A reduced graphene oxide (rGO)-MoS2 heterostructure is designed to tackle challenges such as finite active sites, catalyst poisoning, and poor conductivity. The heterostructure exhibits a record-high piezocatalytic degradation rate, which is significantly higher than that of MoS2 nanosheets. The mechanism of this behavior opens up new possibilities for developing efficient catalysts for wastewater treatment and other applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Applied
Yassine Raoui, Hamid Ez-Zahraouy, Samrana Kazim, Shahzada Ahmad
Summary: Mixed cation and anion based perovskites solar cells show enhanced stability outdoors, but limited power conversion efficiency. Adjusting the electron band offset between the charge transport layers can improve performance.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Physical
Farooq Aslam, Zhen Li, Guanghao Qu, Yang Feng, Shijun Li, Shengtao Li, Hangyin Mao
Summary: The study found that adding OG-POSS to epoxy resin can enhance the breakdown strength by introducing deep-level traps and restricting electron transport due to its high electron affinity and large electronegativity in the side groups.
Article
Chemistry, Physical
Juchan Lee, Myung Joon Kim, InverstigationByeong Geun Jeong, Chan Kwon, Yumin Cha, Soo Ho Choi, Ki Kang Kim, Mun Seok Jeong
Summary: The study investigates the effect of sulfur vacancies on the electrical properties of MoS2. After generating sulfur vacancies through treatment with hydrazine, the density of shallow traps increased by a factor of 4, whereas that of deep-level traps increased by a factor of 200. These results indicate that sulfur vacancies induce both deep- and shallow-level traps, with a higher trap density at the deep level.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Chunyan Yang, Rui Ma, Zhe Wang, Yuanyuan Wang, Chaoyu Yu, Yonggang Liu, Yanfu Wan, Jianfeng Li, Junfeng Tong, Peng Zhang, Heng Zhang
Summary: In this study, a 35 nm thick CdS film was developed as an interfacial modification layer in quantum dot light-emitting diodes (QLEDs) to improve device performance by enhancing charge balance and suppressing interfacial exciton quenching.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
O. Romanyuk, A. Paszuk, I Gordeev, R. G. Wilks, S. Ueda, C. Hartmann, R. Felix, M. Baer, C. Schlueter, A. Gloskovskii, I Bartos, M. Nandy, J. Houdkova, P. Jiricek, W. Jaegermann, J. P. Hofmann, T. Hannappel
Summary: This study investigates the epitaxial growth of GaP films on As-terminated Si substrates and reveals the localization of As atoms in the GaP lattice and at the GaP/Si interface. Chemical shifts in As core levels were observed, and similar valence band offset values were obtained regardless of the doping type, substrate miscut, or As-terminated surface of the Si substrate. The band alignment diagram of the GaP(As)/Si(100) heterostructure was also deduced.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
Mohan Lal Meena, Sudipta Som, Rajneesh Chaurasiya, Shawn D. Lin, Chung-Hsin Lu
Summary: This study developed a series of Na2Ca1-x-yCexMnyP2O7 phosphors using the solid-state reaction method in an H2-N2 environment. The crystal structure, valence state, emission behavior, energy transfer mechanism, and thermal quenching behavior of the phosphors were investigated. Doping with Ce3+ and Mn2+ ions improved the photoluminescence properties of Na2Ca1-x-yCexMnyP2O7, and the addition of Mn2+ ions led to the emission of white light. Energy transfer from Ce3+ to Mn2+ ions was observed, and it was governed by dipole-quadrupole interaction. These phosphors have potential applications in high-power LEDs due to their white light emission, high activation energy, and low thermal quenching behavior.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Condensed Matter
Sumit Kumar, Rajneesh Chaurasiya, Mustaque A. Khan, Gang Meng, Jen-Sue Chen, Mahesh Kumar
Summary: We developed a highly selective and sensitive H2S sensor based on CuO thin film, which was enhanced by decorating with rGO nanosheets. The CuO thin film was deposited using Chemical Vapor Deposition, and the sensing response was improved by forming heterojunctions with rGO. The developed sensor showed high selectivity towards H2S gas and the improvement in sensing response was attributed to increased hole concentration in CuO and increased absorption of H2S molecules.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Nanoscience & Nanotechnology
Shubham Tyagi, Rajneesh Chaurasiya, Nirpendra Singh, Ambesh Dixit
Summary: This study investigates the thermodynamic stability, electronic, and thermoelectric properties of TiB2 and ZrB2 using density functional and Boltzmann transport theory. The results show that the ZrB2 monolayer exhibits dynamic instability in phonon band dispersion, which can be improved by biaxial strain. The electronic properties of the monolayers do not change significantly. The strain modulated Seebeck coefficient, electrical conductivity, and electronic thermal conductivity are studied, revealing a decrease in Seebeck coefficient and an increase in electrical conductivity and electronic thermal conductivity with increasing temperature. The lattice thermal conductivity is found to be higher in TiB2 monolayer compared to ZrB2 monolayer. These findings suggest that strain can enhance the dynamic stability and modulate the thermoelectric properties, and TiB2 monolayer may be a potential low temperature efficient thermoelectric material.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Nanoscience & Nanotechnology
Jia-He Yang, Shi-Cheng Mao, Kuan-Ting Chen, Jen-Sue Chen
Summary: This paper introduces a threshold-switching memristor for artificial neural networks, which mimics multiple biological functions of neurons and overcomes the issues in conventional memristors.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yun-Huei Zeng, Fang-Jui Chu, Li-Chung Shih, Yu-Chieh Chen, Jen-Sue Chen
Summary: The integration and cooperation of the retina, neurons, and synapses in the visual systems allow humans to sense and process visual information with low power consumption. An artificial sensory nerve with optical sensing and neural coding has been developed to mimic the human visual system. By applying two consecutive light stimuli to a phototransistor, the positive and negative correlations between paired-pulse ratio (PPR) and light pulse time interval were consistently revealed. The phototransistor contains a heterostructured channel layer composed of zinc-oxide nanoparticles interconnected with a solution-processed zinc-tin oxide film.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Kuan-Ting Chen, Li-Chung Shih, Shi-Cheng Mao, Jen-Sue Chen
Summary: Neuromorphic computing is a promising approach to reduce latency and energy consumption in massive data processing. We have developed an ITO/TaOx-based synaptic capacitor and transistor that can adjust synaptic weights. The capacitor showed better performance in handwritten digit recognition and consumed less energy compared to the transistor. These findings demonstrate the potential of the ITO/TaOx-based capacitor in capacitive neural networks.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
I-Wen Wang, Li-Chung Shih, Jeng-Ting Li, Jen-Sue Chen
Summary: Compared to conventional voltage-gated channels, the photo-induced gating effect allows for controlling carrier concentration and remote operation in thin-film transistors (TFTs). The photo-gated zinc-tin oxide TFT (ZTO TFT) demonstrates the feasibility of achieving various output characteristics at V-G = 0 V. Current saturation in the I-D-V-D curves of the photo-gated ZTO TFT confirms the presence of a light-induced pinch-off region, indicating a positive pseudogate voltage in the channel under lighting. The photogating mechanism and efficiency are discussed in terms of the photoionization of neutral oxygen vacancies to positively charged oxygen vacancies.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Optics
Abhijeet J. Kale, Rajneesh Chaurasiya, Ambesh Dixit
Summary: This article highlights the potential of Cs2CuBiCl6 halide double perovskite as an ultrathin absorber in solar cells. Numerical simulation shows that the Cs2CuBiCl6-based all-inorganic inverted solar cell exhibits a power conversion efficiency of around 17.03% for a 100 nm ultrathin absorber in a single junction cell. The simulated device demonstrates good tolerance towards absorber defect density, interfacial effects, and intrinsic heat.
Article
Materials Science, Multidisciplinary
Yen-Cheng Mi, Ching-Hsiang Yang, Li-Chung Shih, Jen-Sue Chen
Summary: In this study, an all-optical-controlled IGZO/ZrOx phototransistor is demonstrated to emulate synaptic functions via both positive and negative photoresponse. With the coupling effect of photogenerated electrons and the charged M-M++ defect scattering, the IGZO/ZrOx photosynaptic transistor not only shows broadband photosensing performance but also emulates the excitatory/inhibitory contrasting synaptic functions. The optical information conveyed by the all-optical-controlled IGZO/ZrOx photosynaptic transistor is effective for streaming sensor processing in biologically inspired computer vision application.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Sumit Kumar, Rajneesh Chaurasiya, Shashank Shekhar Mishra, Partha Kumbhakar, Gang Meng, Chandra Sekhar Tiwary, Krishanu Biswas, Mahesh Kumar
Summary: In this study, researchers reported a highly sensitive and selective NO2 sensor fabricated through low-cost and scalable methods using a hybrid nanocomposite of two-dimensional Al70Co10Fe5Ni10Cu5 quasicrystal (QC) nanosheets and MoS2 nanoflakes. The Al70Co10Fe5Ni10Cu5/MoS2 heterostructure showed an excellent gas-sensing response of about 66%, which is 2.27 times higher than that of the pristine MoS2 nanoflakes-based sensor. The integration of the 2D Al70Co10Fe5Ni10Cu5 QC with MoS2 nanoflakes holds great promise in the design and development of NO2-based gas-sensing technology.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Hao-Chun Chang, Chao-Lung Chiang, Yan-Gu Lin, Wei-Che Tseng, Chao-Cheng Kaun, Yen-Hsun Su, Jen-Sue Chen, Jih-Jen Wu
Summary: The electronic structure of TiO2 nanorod array is modulated by depositing Pt nanoparticles with different configurations, affecting the selectivity of photocatalytic CO2 conversion. In-situ XANES measurements suggest that the active sites for the photocatalytic reaction are located on the TiO2 nanorod surface, not on the Pt nanoparticles. The t2g/eg and dz2/dx2_y2 ratios of TiO2 are correlated with the selectivity of H2 and CH4 for photocatalytic CO2 conversion and the adsorption energies of H and CO on TiO2 surface, indicating the crucial role of Pt nanoparticles as promoters.
APPLIED SURFACE SCIENCE
(2023)
Review
Materials Science, Multidisciplinary
Rajneesh Chaurasiya, Li-Chung Shih, Kuan-Ting Chen, Jen-Sue Chen
Summary: This review paper discusses the different types of higher-order memristors, including their mechanism and applications. Higher-order memristors exhibit dynamic complexity and adaptive properties through multiple internal state variables, mimicking the neuronal and synaptic properties of biological systems, and show potential for processing temporal information and performing analogue computing.
Article
Materials Science, Multidisciplinary
Li-Chung Shih, Kuan-Ting Chen, Shi-Cheng Mao, Ya-Chi Huang, Fang-Jui Chu, Tzu-Hsiang Liu, Wen-Hui Cheng, Jen-Sue Chen
Summary: In the field of cognitive neuroscience, the coupling of homosynaptic activation and heterosynaptic modulation is crucial for enhancing memory consolidation. By integrating optosynapses into neuromorphic visual systems, the replication of human visual mechanisms can lead to reduced latency, power consumption, and improved cognitive performance. This study demonstrates a zinc-tin oxide (ZTO) and gold nanoparticle (NP) heterostructure optosynapse, enabling super-additive interaction between homosynaptic and heterosynaptic plasticity and enhancing learning and memory performance. Additionally, the optosynapse also has the capability to perform logic operations, making it suitable for integration into neuromorphic computing architectures and advancing machine vision.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Fang-Jui Chu, Yu-Chieh Chen, Li-Chung Shih, Shi-Cheng Mao, Jen-Sue Chen
Summary: In this study, a dual-gate ferroelectric polymer P(VDF-TrFE)-coupled IGZO thin-film transistor is proposed, which exhibits both short- and long-term memory functionalities and can be utilized in the reservoir and readout layers of neuromorphic computers. This technology holds significant potential for next-generation hybrid intelligent applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
