Light-induced negative differential resistance effect in a resistive switching memory device

April 2024Apr 01, 2024Current IssueVol. 60

    April, 2024 | Volume 60
  • Article 2024-04-30

    Parametric dependence of CsPbI2Br perovskite film growth using a mist chemical vapor deposition method

    Curr. Appl. Phys. 2024; 60: 1-8

    Abstract : Using an atmospheric mist chemical vapor deposition, we successfully fabricated inorganic CsPbI2Br films under various growth conditions. The process condition of the film growth was experimentally determined as follows: 0.4 M CsPbI2Br precursor in a mixed solvent with a 4:1 ratio (v/v %) of N, N-dimethylformamide and dimethyl sulfoxide, carrier and dilution N2 flow rates of 200 and 1500 cc/min, substrate temperature of 68 °C, and growth time of 35 min. In the characterization of the structural and optical properties, all the films exhibited a well-defined α-CsPbI2Br cubic crystal structure and optical bandgap energy of 1.914 eV. For the preparation of smooth defect-free CsPbI2Br films, it is crucial to maintain a growth condition with a narrow operation tolerance to stabilize the amount of precursor mist that flows through a rectangular channel reactor with a proper ratio of ∼1/10 for the carrier-to-dilution N2 gas flow rate at the low substrate temperature of 68 °C. © 2024 Korean Physical Society

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  • Article 2024-04-30

    Temperature dependence of photoluminescence in twisted heterobilayers of transition-metal dichalcogenides

    Curr. Appl. Phys. 2024; 60: 9-14

    Abstract : Two-dimensional (2D) van der Waals transition metal dichalcogenides (TMDCs) are highly attractive due to their novel phenomena and potential device applications. Especially, twisted heterojunction of different 2D TMDC monolayers for various twist angles (θ) is one of the hot issues in the area of 2D TMDCs because they exhibit exotic quantum behaviors. Here, we report the effect of temperature (T) on the θ-dependent variation of photoluminescence (PL) spectra of MoS2/WS2 heterobilayers. The PL peak-vs-T variations are divided into three θ regions. Near θ = 0 and 60°, the PL peak energies show almost monotonically-decreasing behaviors with increasing T, caused by stronger electron-phonon interactions at higher T. However, in the intermediate θ range, the PL peaks show similar red shifts over almost full T range except anomalous blue shifts in a short T range near ∼150 K. We discuss this anomalous PL behaviors based on hybridization of interlayer and intralayer excitons, resulting in the formation of hybridized excitons, correlated with structural transition. © 2024 Korean Physical Society

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  • Review 2024-04-30

    Thermoelectric properties of extrinsic phase mixing in chalcogenide bulk nanocomposites

    Curr. Appl. Phys. 2024; 60: 15-31

    Abstract : In recent years, application of nanostructured thermoelectric materials got a significant research interest. Earlier nanostructure materials like superlattice or quantum dot are available as a thin film or in minute quantity, but current research on bulk nanostructured compound provides a large number of thermoelectric materials. The synthesis of bulk nanocomposite is an efficient way of lowering thermal conductivity for the enhancement of thermoelectric performance. In this review, we will discuss the concept of bulk nanocomposites by extrinsic phase mixing and how it can affect thermoelectric energy conversion. A structural phase transition near 420 K in Ag2Te raises the interface potential effect, which implies its dispersion in the Bi2Te3, Sb2Te3, and PbTe-based matrices. The enhancement of the thermoelectric properties also discussed by the charge-selective Anderson localization while preserving the extended electronic state. For nanostructure bulk composite a very high thermoelectric figure-of-merit, ZT > 2.0 has been achieved, suggesting this may be a versatile approach for power generation from waste heat. In this review, we emphasized the thermoelectric properties of extrinsic phase mixed bulk nanostructured composites and the future outlook of how the ZT value can be improved for these nanocomposites are also discussed. © 2024 Korean Physical Society

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  • Article 2024-04-30

    Ag-doped MnO2 nanowires integrated with graphitic carbon nitride for enhanced photocatalytic applications for waste water treatment

    Curr. Appl. Phys. 2024; 60: 32-42

    Abstract : For the synthesis of Ag-doped MnO2 nano-wires-like morphology, the hydrothermal method was used. The composite of Ag-doped MnO2 nano-wires nanocomposite with g-C3N4 (Ag–MnO2/g-C3N4 (10 %) was made using an ultra-sonication approach. The formation of doped and un-doped MnO2 nano-wires (NWRs) was confirmed by XRD, and for the detection of functional groups, FTIR analysis was done. Surface morphology and optical analysis were done by SEM and UV–visible spectro-photometry. The Ag–MnO2/g-C3N4 (10 %) showed tremendous photo-catalytic efficiency towards MB and BA. Ag–MnO2/g-C3N4 (10 %) exhibited 51.38 % degradation of BA and 83.67 % of MB under visible light irradiation. Ag-doped MnO2 nano-wires (NWRs) exhibited better photo-catalytic efficiency as compared to bare MnO2. This work represents that the photo-catalyst Ag–MnO2/g-C3N4 (10 %) is capable of photodegradation of dyes and organic compounds as it has a greater potential for establishing a better green environment. © 2024 Korean Physical Society

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  • Review 2024-04-30

    Recent technical advancements in ARPES: Unveiling quantum materials

    Curr. Appl. Phys. 2024; 60: 43-56

    Abstract : The technical evolution of angle-resolved photoemission spectroscopy (ARPES) in the late 90s played a pivotal role in the exploration of electronic structures in condensed matter systems. ARPES achieved numerous successes during this period, notably capturing the first evidence of the unconventional d-wave symmetry of the superconducting gap in cuprate superconductors. It also elucidated the essential rules governing topological signatures in the electronic structures of topological materials, and played an essential role in demonstrating the engineered band structures of atomically thin materials. These early achievements spurred significant advancements in the technique. This topical review delves into four cutting-edge ARPES techniques that are currently at the forefront of development: time-resolved ARPES, nano ARPES, in-situ ARPES, and ARPES with novel control parameters. By examining the capabilities of these innovative approaches, we aim to illustrate their potential in unlocking new frontiers and providing unprecedented insights on the electronic structure of quantum materials. © 2024 The Author(s)

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  • Article 2024-04-30

    Magnetic and magnetocaloric behaviors of a perovskite/hausmannite composite

    Curr. Appl. Phys. 2024; 60: 57-63

    Abstract : We present here a detailed study on the magnetic and magnetocaloric (MC) behaviors of a perovskite/hausmannite composite material of LYCMO/Mn3O4, where LYCMO (La0.5Y0.1Ca0.4MnO3) is a primary phase of 95 wt%. The analysis of M(T) data indicates a coexistence of ferromagnetic-paramagnetic transitions associated with LYCMO and Mn3O4 at about 56 and 43 K, respectively. Critical-behavior analyses have proved the composite exhibiting a second-order phase transition at magnetic fields H ≤ 10 kOe, with critical exponents β = 0.347 and γ = 1.167 characteristic of 3D-Heisenberg and 3D-Ising ferromagnets, respectively. At higher fields, it tends to exhibit crossover behaviors of first-/second-order transitions. As analyzing the MC effect upon isothermal M(H) data, we have found the maximum magnetic-entropy change of ∼3.1 J/kg⋅K, and the relative refrigerant capacity (RCP) of ∼150 J/kg for H = 30 kOe, which are higher than those obtained for other oxides in the same temperature and applied-magnetic ranges. With the absence of hysteresis loop and large RCP value, this material can be used in magnetic-cooling devices working at temperatures T = 40∼85 K to liquefy nitrogen. © 2024 Korean Physical Society

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  • Article 2024-04-30

    High frequency permittivity of rare-earth Er-doped MoS2 films

    Curr. Appl. Phys. 2024; 60: 64-69

    Abstract : Two-dimensional (2D) MoS2 has attracted considerable attention for their significant potential application in high-frequency electronic devices. In this work, erbium doped MoS2 (Er:MoS2) film is prepared by chemical vapor deposition. The structures and binding energy are studied by X-ray photoelectron spectroscopy indicating the substitution of Er atoms into MoS2 lattices. The complex permittivity of the film is measured by the microstrip line up to the frequency of 4 GHz. The high frequency permittivity ε′ of MoS2 film is 4.11 and ε′ increases about 28% when the Er doping amount is 0.83 at% (atomic percentage). The permittivity of Er:MoS2 film is higher than that of MoS2 film, which is mainly due to the enhanced polarization of Er:MoS2 film. The permittivity ε′ of Er:MoS2 film increases with the increase of Er doping (0∼0.83 at%). It is believed that Er:MoS2 film has great potential application in tunable electromagnetic devices. © 2024 Korean Physical Society

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  • Article 2024-04-30

    Increased magnetocaloric response of La2/3Ca1/3MnO3/Gd nanocomposites in a large temperature range

    Curr. Appl. Phys. 2024; 60: 70-78

    Abstract : It has been known that a La2/3Ca1/3MnO3 (LMO) bulk sample has the maximum magnetic entropy change (|ΔSmax|) larger than |ΔSmax| of Gd – a conventional magnetocaloric (MC) material. However, such large change just takes place in a narrow range of temperature because of its first-order character. This influences the working temperature range (ΔT) and relative cooling power (RCP) of LMO. Previous works have revealed that the fabrication of LMO nanoparticles with the second-order character would improve the magnitude of ΔT and RCP, and reduce magnetic hysteresis losses. In this work, we suggest that the combination of LMO nanoparticles (NPs) with Gd powder as nanocomposites (NCPs), termed (100-x)LMO + xGd with x = 50 and 75 wt%, further enhances ΔT from 60 to ∼94 K (in the range T = 220–314 K) for applied fields H = 5–20 kOe. These values are larger than those of initial materials Gd and LMO NPs (ΔT ≈ 40 K), reported composites (ΔT < 50 K), and even the composites fabricated from a LMO bulk and Gd powder (ΔT < 60 K) in the same fields. Additionally, all NCPs exhibit the second-order character, and RCP of optimal NCPs is nearly comparable to that of Gd. These features demonstrate application potentials of NCPs for conventional refrigerators operating in a large temperature range. © 2024 Korean Physical Society

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  • Article 2024-04-30

    Hierarchical synthesis of binary ZnO@MWCNTs heterogeneous photocatalyst derived from porous Zn metal organic framework (MOF) template: Study on the effective photodegradation of Congo red (CR) dye

    Curr. Appl. Phys. 2024; 60: 79-91

    Abstract : This study presents the synthesis of a heterogeneous ZnO@MWCNTs photocatalyst through a solvothermal method, employing a Zn-metal organic framework (MOF) template. The resulting nanocomposite showcases ZnO nanorods integrated with MWCNTs, forming a material characterized by nanosized building blocks, a substantial specific surface area, robust pore structure, and uniform morphology. A comprehensive XRD characterization reveals crystalline ZnO nanorods proficiently loaded onto the MWCNTs surface, forming a cohesive nano-composite. The inclusion of MWCNTs influences crystal growth, reducing crystallite size and altering optical absorption due to surface Plasmon resonance. This leads to a higher concentration of surface hydroxyl groups in the ZnO framework. Additionally, MWCNTs act as electron sinks, significantly reducing ZnO photooxidation and enhancing overall photostability in the composite. The photocatalytic efficacy of the composite in Congo Red (CR) degradation is impressive, achieving 92% degradation within 90 min of UV light exposure. A proposed photocatalytic mechanism elucidates the heightened performance of the synthesized photocatalysts. Notably, the MOF-derived ZnO@MWCNTs exhibited superior dye adsorption capacity compared to alternative adsorbents. This work underscores the immense potential of the ZnO@MWCNTs nanocomposite as a highly efficient photocatalyst for environmental remediation, offering significant advancements in dye degradation and wastewater treatment technologies. © 2024 Korean Physical Society

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