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Near-infrared photodetection in tin halide perovskites via compositional engineering

Materials science and Engineering R: Reports 2025年 165卷

作者： Park, Hansol Lee, Cheong Beom Lim, Seon-Jeong Kim, Hakjun Kim, Kyeounghak Park, Hui Joon Department of Organic and Nano Engineering Hanyang University Seoul04763 Korea Republic of Human-Tech Convergence Program Hanyang University Seoul04763 Korea Republic of Department of Chemistry Hanyang University Seoul04763 Korea Republic of Samsung Advanced Institute of Technology Samsung Electronics Suwon16678 Korea Republic of Department of Chemical Engineering Hanyang University Seoul04763 Korea Republic of Department of Semiconductor Engineering Hanyang University Seoul04763 Korea Republic of Institute of Nano Science Technology Hanyang University Seoul04763 Korea Republic of

Tin (Sn) halide perovskites, with an optical bandgap below 1.4 eV, are promising for near-infrared photodetectors (NIR-PDs). However, their inherent instability due to Sn2+ oxidation and sensitivity to processing often results in non-uniform films with low crystallinity. Most research has focused on formamidinium tin triiodide (FASnI3), while methylammonium tin triiodide (MASnI3), with an optical bandgap of 1.2–1.3 eV and light absorption in the 300–1100 nm range, has been less explored due to its instability. Here, we demonstrate that substituting A-site cations (Cs and Rb) and X-site halides (Cl) in MASnI3 significantly enhances its stability, improving crystallinity and reducing trap density. PD devices with modified MASnI3 exhibit enhanced photo-response across the visible to NIR region, achieving specific detectivity over 1.7 × 1012 Jones at 940 nm, with a fast response time (trise/tfall = 3.85 μs/5.70 μs) under low irradiance of 0.104 mW cm−2. © 2025 Elsevier B.V.

关键词： Photodetectors

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Helicity-tunable spin Hall and spin Nernst effects in unconventional chiral fermion semimetals XY (X=Co,Rh;Y=Si,Ge)

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Physical Review B 2022年第16期106卷 165102-165102页

作者： Ting-Yun Hsieh Babu Baijnath Prasad Guang-Yu Guo Department of Physics National Taiwan University Taipei 10617 Taiwan Republic of China Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei 11529 Taiwan Republic of China Physics Division National Center for Theoretical Sciences Taipei 10617 Taiwan Republic of China

Transition metal monosilicides CoSi, CoGe, RhSi, and RhGe in the chiral cubic B20 structure (the CoSi family) have recently been found to host unconventional chiral fermions beyond spin-1/2 Weyl fermions, and also to exhibit exotic physical phenomena such as long Fermi arc surface states, gyrotropic magnetic effect, and quantized circular photogalvanic effect. Thus, exploring novel spin-related transports in these unconventional chiral fermion semimetals may open a new door for spintronics and spin caloritronics. In this paper, we study the intrinsic spin Hall effect (SHE) and spin Nernst effect (SNE) in the CoSi family based on ab initio relativistic band structure calculations. First, we find that unlike nonchiral cubic metals, the CoSi family have two independent nonzero spin Hall (Nernst) conductivity tensor elements, namely, σxyz and σxzy (αxyz and αxzy) instead of one element. Furthermore, the SHC (σxyz and σxzy) and helicity of the chiral structure are found to be correlated, thus enabling SHE detection of structural helicity and also chiral fermion chirality. Second, the intrinsic SHE and SNE in some of the CoSi family are large. In particular, the calculated spin Hall conductivity (SHC) of RhGe is as large as −140 (ℏ/e)(S/cm). The calculated spin Nernst conductivity (SNC) of CoGe is also large, being −1.3 (ℏ/e)(A/m K) at room temperature. Due to their semimetallic nature with low electrical conductivity, these topological semimetals may have large spin Hall and spin Nernst angles, being comparable to that of platinum metal. The SHC and SNC of these compounds can also be increased by raising or lowering the chemical potential to, e.g., the topological nodes, via either chemical doping or electrical gating. Our findings thus indicate that transition metal monosilicides of the CoSi family not only would provide a material platform for exploring novel spin transports and exotic phenomena in unconventional chiral fermion semimetals, but also could be promising m

关键词： Electronic structure Spin Hall effect Spin caloritronics Spintronics Semimetals Topological materials First-principles calculations

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From food toxins to biomarkers: Multiplexed detection of aflatoxin B1 and aflatoxin M1 in milk and human serum using PEGylated ternary transition metal sulfides

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Sensors and Actuators Reports 2023年 5卷

作者： Yadav, Kanchan Moovendaran, Kalimuthu Dhenadhayalan, Namasivayam Lee, Shang-Fan Leung, Man-Kit Sankar, Raman Department of Chemistry National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei106 Taiwan Nano Science and Technology Program Taiwan International Graduate Program Academia Sinica and National Taiwan University Taipei Taiwan Institute of Physics Academia Sinica Taipei11529 Taiwan

Aflatoxins (AF) are fungal toxins which not only contaminate food, but also adversely impact human health if consumed and serve as biomarkers for deadly diseases like liver cancer. Therefore, there is a strong need to develop ultra-sensitive AF detection method in physiological environments. In the present study, ternary transition metal sulfides single crystals (Mn0.02Ta3S6 and Fe0.65Ta3S6) were grown, exfoliated to thin layered nanosheets (NSs) followed by polyethylene-glycol modification (PEG@NSs). High fluorescence quenching abilities towards the aptamers for AF biosensing were demonstrated using PEGylated NSs. It has been observed that PEGylated NSs improves the detection sensitivity ∼ 248 times better than non-PEGylated NSs. Subsequently, multiplexed detections of aflatoxin B1 (AFB1) and M1 (AFM1) in diverse mediums including PBS buffer (1 ×), milk and human serum were performed by employing PEG@Mn0.02Ta3S6 NSs with TAMRA dye-labelled AFB1 aptamer and FAM dye-labelled AFM1 aptamer, respectively. The fluorescence intensity of designed sensor exhibited ultrasensitive detections (∼ pM) and a wide linear range (≥ 5 orders). Hence, the present study can serve as a unique platform for facile, ultra-sensitive, selective, cost-effective and quick multiplexed detection of food toxins and disease biomarkers in complex-matrix. © 2023

关键词： Polyethylene glycols

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Oxygen-Incorporated Lithium-Rich Iron Sulfide Cathodes for Li-Ion Batteries with Boosted Material Stability and Electrochemical Performance

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Chemistry of Materials 2024年第19期36卷 9370-9379页

作者： Hailemariam, Adane G. Syum, Zeru Mamo, Tadios T. Qorbani, Mohammad Hsing, Cheng-Rong Sabbah, Amr Quadir, Shaham Bayikadi, Khasim S. Wu, Heng-Liang Wei, Ching-Ming Chen, Li-Chyong Chen, Kuei-Hsien Institute of Atomic and Molecular Sciences Academia Sinica Taipei10617 Taiwan Sustainable Chemical Science and Technology Taiwan International Graduate Program Academia Sinica Nangang Taipei11529 Taiwan Institute of Chemistry Academia Sinica Nangang Taipei11529 Taiwan Department of Applied Chemistry National Yang-Ming Chiao Tung University Hsinchu30010 Taiwan Department of Chemistry College of Natural Science Dire Dawa University Dire Dawa1362 Ethiopia Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan Department of Chemistry National Taiwan University Taipei10617 Taiwan Institute of Physics Academia Sinica Taipei11529 Taiwan Nano Science and Technology Taiwan International Graduate Program Academia Sinica Nangang Taipei11529 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei10617 Taiwan Division of Natural Science Center for General Education Chang Gung University Taoyuan City33302 Taiwan Tabbin Institute for Metallurgical Studies Tabbin Helwan 109 Cairo11421 Egypt GoldenCO80401 United States Department of Chemistry Northwestern University EvanstonIL60208 United States National Synchrotron Radiation Research Center Hsinchu30092 Taiwan Department of Physics National Taiwan University Taipei10617 Taiwan

Affordable and environmentally friendly electrode materials with multielectron redox reactions are imperative for the advancement of next-generation Li-ion batteries. In this context, the Li-rich layered iron sulfide cathode material (i.e., Li2FeS2) stands out as a promising candidate due to its unique multielectron cationic and anionic redox features. However, its practical application is hampered by inherent limitations in terms of poor structural stability and cycling performance. Herein, we conduct a systematic investigation into the impact of anionic substitution, where sulfur is partially replaced with oxygen, on the structural stability, intrinsic conductivity, and electrochemical properties of the Li2FeS2 cathode. First-principle calculations confirm that an optimum amount of oxygen incorporation is beneficial to stabilize the crystal structure and improve Li ion diffusion. Furthermore, cathodes with oxygen incorporation exhibit significant structural stability even when exposed to air for 24 h, demonstrating resistance against moisture. The Li2FeS1.8O0.2 cathode achieves a higher Coulombic efficiency of ∼100%, charge-discharge capacity of 310 mA h g-1 after 100 cycles, and a remarkable capacity recovery of around 94% following rate capability tests spanning 75 cycles. These findings introduce an innovative anion substitution approach for the development of Li-rich layered sulfide cathode materials, effectively mitigating structural deterioration. © 2024 American Chemical Society.

关键词： Cathodes

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Magnetism-induced second-order nonlinear optical responses in multiferroic BiFeO3

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Physical Review B 2024年第1期110卷 014422-014422页

作者： Babu Baijnath Prasad Guan-Fu Liu Guang-Yu Guo Department of Physics and Center for Theoretical Physics Nano Science and Technology Program Taiwan International Graduate Program Physics Division

Nonlinear optical (NLO) responses of noncentrosymmetric nonmagnets have drawn a lot of attention in the past decades because of their significance in materials characterization, green energy, and device applications. On the other hand, magnetism not only can break the inversion symmetry in centrosymmetric crystals but also introduce additional NLO phenomena in noncentrosymmetric materials, thus enabling the magnetic field control of light-matter interactions. However, the magnetism-induced NLO responses have rarely been studied so far. In this paper, we study the magnetism-induced NLO responses of multiferroic bismuth ferrite (BiFeO3) based on density-functional-theory calculations. First, we find that the calculated magnetism-induced second-harmonic generation (SHG) susceptibilities are large and the SHG intensity is tunable with the reversal of magnetization. In particular, the interference between crystallographic SHG and magnetically induced SHG components results in a strong magnetic contrast of the SHG signal of ∼440% at SHG photon energy of 4.82 eV, thus enabling a magnetic control of the SHG in multiferroic BiFeO3. Also, because of the sensitivity of the SHG signal to the direction of the Néel vector, the SHG can be utilized to detect the reversal of the Néel vector in the AFM materials, which is an important issue for AFM spintronics. Second, the calculated bulk photovoltaic effects (BPVE) in BiFeO3 are also strong, being larger than some well-known NLO compounds such as BaTiO3, GaAs, CdS, and CdSe. Finally, we analyze the origins of the prominent features in the NLO response spectra in terms of the calculated quantum geometric quantities. Our interesting findings suggest that the magnetism-driven NLO responses in BiFeO3 are significant, anisotropic, and tunable and that understanding the magnetism-driven components of both SHG and BPVE is essential for their applications in, e.g., multiferroic-based photovoltaic devices and second-harmonic generation.

关键词： Antiferromagnetism Electronic structure Nonlinear optical susceptibility Photogalvanic effect Second order nonlinear optical processes Antiferromagnets Magnetic semiconductors Multiferroics Density functional theory First-principles calculations

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Tailoring the plasmonic properties of complex transition metal nitrides: A theoretical and experimental approach

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Applied Surface science 2023年 641卷

作者： Usman Javed, M. Yang, Jing-Wei Kumari, Shweta Mustaqeem, Mujahid Peng, Tze-Yu Chung Yang, Li Lu, Yu-Jung Kaun, Chao-Cheng Department of Physics National Taiwan University Taipei10617 Taiwan Research Center for Applied Sciences Academia Sinica Taipei11529 Taiwan Department of Chemistry National Taiwan University Taipei10617 Taiwan Nano Science and Technology Program TIGP Academia Sinica Taipei11529 Taiwan

Transition metal nitrides (TMNs) are promising materials for developing next-generation photonic devices. A practical way toward high-performance TMNs is to tune their plasmonic properties through different compositions. Here, we investigate the electronic structures and optical properties of TMNs (Ti1-xZrxN and Ti1-xHfxN, x = 0, 0.25, 0.50, 0.75, and 1) computationally and experimentally. Our calculated dielectric permittivities and quality factors suggest that the overall performance of TMNs is well-tuned by their compositions, supported by our measured data obtained from the 50-nm thick TMN films deposited on sapphire (0001). Particularly, at the dielectric-metallic interface, Ti0.25Hf0.75N (ENZ of 401 nm) and Ti0.50Zr0.50N (ENZ of 406 nm) show a better dielectric response than the binary TMNs. Ti0.50Hf0.50N (ENZ of 457 nm) holds promise for applications requiring efficient energy absorption and enhanced wave manipulation in the near-infrared range. Using mixed ternary TMNs to tune plasmonic properties in the visible and near-infrared regions can thus achieve frequency-targeting photonics applications. © 2023 Elsevier B.V.

关键词： Optical properties

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Mechanical Analysis of Lithium-Ion Batteries Via Acoustic Impedance Spectroscopy

ACS Electrochemistry

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ACS Electrochemistry 2025年第4期1卷 516-522页

作者： Charles Soulen Stewart Sherrit Erik Brandon Ping Liu Program of Materials Science and Engineering University of California San Diego 9500 Gilman Drive La Jolla California 92093 United States Jet Propulsion Laboratory California Institute of Technology 4800 Oak Grove Drive Pasadena California 91109 United States Program of Materials Science and Engineering University of California San Diego 9500 Gilman Drive La Jolla California 92093 United States；Aiiso Yufeng Li Department of Chemical and Nano Engineering University of California San Diego 9500 Gilman Drive La Jolla California 92093 United States

The mechanical properties of lithium-ion batteries (LIB) are closely related to their state-of-charge (SOC) and state-of-health (SOH). Here, we introduce an in-operando acoustic technique based on acoustic impedance spectroscopy (AIS) which probes the mechanical changes that occur in the LIB during operation. Using thin, inexpensive piezoelectric resonators and widely available impedance analyzers, we can identify the acoustic resonances of commercial LIBs by measuring the complex electrical impedance of the resonator. In-operando AIS shows that these resonances are dependent on the bulk mechanical properties of the LIB, which change reversibly as the cell is cycled. We show that this technique can provide substantial information on both the SOC and SOH of a commercial LIB.

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Impact of fabrication methods on binder distribution and charge transport in composite cathodes of all-solid-state batteries

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Materials Futures 2023年第4期2卷 127-135页

作者： Benjamin Emley Chaoshan Wu Lihong Zhao Qing Ai Yanliang Liang Zhaoyang Chen Liqun Guo Tanguy Terlier Jun Lou Zheng Fan Yan Yao Materials Science and Engineering Program and Texas Center for Superconductivity at the University of Houston University of Houston4726 Calhoun RdHoustonTX 77204United States of America Department of Electrical and Computer Engineering University of Houston4726 Calhoun RdHoustonTX 77204United States of America Department of Materials Science and Nano Engineering Rice University6100 Main StreetHoustonTX 77005United States of America SIMS Laboratory Shared Equipment AuthorityRice UniversityHoustonTX 77005United States of America Department of Engineering Technology University of HoustonHoustonTX 77204United States of America

The manufacturing process of all-solid-state batteries necessitates the use of polymer ***,these binders,being ionic insulators by nature,can adversely affect charge transport within composite cathodes,thereby impacting the rate performance of the *** this work,we aim to investigate the impact of fabrication methods,specifically the solvent-free dry process versus the slurry-cast wet process,on binder distribution and charge transport in composite cathodes of solid-state *** the dry process,the binder forms a fibrous network,while the wet process results in binder coverage on the surface of cathode active *** difference in microstructure leads to a notable 20-fold increase in ionic conductivity in the dry-processed ***,the cells processed via the dry method exhibit higher capacity retention of 89%and 83%at C/3 and C/2 rates,respectively,in comparison to 68%and 58%for the wet-processed cells at the same *** findings provide valuable insights into the influence of fabrication methods on binder distribution and charge transport,contributing to a better understanding of the binder’s role in manufacturing of all-solid-state batteries.

关键词： solid-state battery solvent-free dry process polymer binder lithium thiophosphate electrolyte

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Electroactive Carbazole-Based Polycyclic Aromatic Hydrocarbons: Synthesis, Photophysical Properties, and Computational Studies

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ACS omega 2024年第27期9卷 29379-29390页

作者： Hui Qi Wong Ting-Hsuan Lin Jian-Ming Liao Septia Kholimatussadiah Febri Baskoro Hui-Hsu Gavin Tsai Hung-Ju Yen Institute of Chemistry Academia Sinica 128 Academia Road Section 2 Nankang Taipei 11529 Taiwan. Sustainable Chemical Science and Technology Program Taiwan International Graduate Program (TIGP) Academia Sinica and National Taiwan University Taipei 11529 Taiwan. Department of Chemical Engineering National Taiwan University Taipei 10617 Taiwan. Department of Chemical Engineering National Taiwan University of Science and Technology Taipei 10607 Taiwan. Department of Chemistry National Central University No. 300 Zhongda Rd. Zhongli District Taoyuan City 32001 Taiwan. Nano Science and Technology Program TIGP Academia Sinica and National Taiwan University Taipei 11529 Taiwan. Research Center of New Generation Light Driven Photovoltaic Module National Central University No. 300 Zhongda Road Zhongli District Taoyuan City 32001 Taiwan.

Herein, we explored the oxidative coupling reactions of carbazole-based polycyclic aromatic hydrocarbons using traditional Scholl reactions and electrochemical oxidation. Our findings indicate that the oxidation predominantly occurs at the carbazole functional group. The underlying reaction mechanisms were also clarified through theoretical investigations, highlighting that the primary oxidation pathway involves the 3,6-positions of the carbazole moiety, which is attributable to its high electron density.

关键词： Aromatic compounds Cations Show More

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Enhancing the absorption figure of merit on solution-based CuO thin films by Ni doping

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Optical Materials: X 2023年 19卷

作者： Loi, Nguyen Van Mai, La Thi Ngoc Luong, Nguyen Hoang Nguyen Quoc Trinh, Bui Faculty of Physics University of Science Vietnam National University Hanoi 334 Nguyen Trai Thanh Xuan Hanoi Viet Nam Nanotechnology Program Faculty of Advanced Technology and Engineering Vietnam Japan University Vietnam National University Hanoi Luu Huu Phuoc Nam Tu Liem Hanoi Viet Nam Nano and Energy Center University of Science Vietnam National University Hanoi 334 Nguyen Trai Thanh Xuan Hanoi Viet Nam Key Laboratory for Micro-Nano Technology University of Engineering and Technology Vietnam National University Hanoi 144 Xuan Thuy Cau Giay Hanoi Viet Nam

We evaluated an absorbance effectiveness on the solar spectrum using an absorption figure of merit (a-FOM) for the conducting thin films. In particular, Ni-doped and un-doped CuO thin films were deposited by a facile and sustainable solution-processed synthesis, whose Ni doping concentration was varied to be 0.2, 0.6, 1, 2, 3, 4 wt%. We observed a change of smooth surface to an appearance of nanoparticles by Ni doping, which supported to form of a plasmonic mechanism for improving the light capture and retention. The absorption of long wavelengths was improved and extended to the near-infrared range. That is, the bandgap energy decreased from 2.10 to 1.88 eV with Ni doping. Also, we found that the absorption length decreased from 99.93 nm to 63.80 nm as the Ni doping increased. In addition, the CuO-based film with 4 wt% Ni doping showed a maximal value of a-FOM as high as 30.88 Ω−1cm−1, corresponding to a resistance of 2.07 MΩ/sq and an absorption length of 63.80 nm. Our finding suggested that Ni-doped CuO thin films can be considered as an excellent selection of absorbent conductive oxide layers for application in optoelectronic devices and solar cell systems. © 2023 The Author(s)

关键词： Copper oxides

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