Journal of Science: Advanced Materials and Devices最新文献

{"title":"Controlling activation parameters in phytagel-derived activated carbons for enhanced supercapacitor performance","authors":"Sushant Kumar ,&nbsp;R.C. Singh ,&nbsp;Vinay Deep Punetha ,&nbsp;Pawan Singh Dhapola ,&nbsp;Markus Diantoro ,&nbsp;Manoj K. Singh ,&nbsp;Pramod K. Singh","doi":"10.1016/j.jsamd.2025.101055","DOIUrl":"10.1016/j.jsamd.2025.101055","url":null,"abstract":"<div><div>Activated carbons, due to their high surface area and well-developed pore structure, are excellent electrode materials for energy storage devices. The properties of activated carbons can be tuned by modifying certain factors, such as activating agent, activation temperature, time, concentration of activating agent, etc. In the present work, the effect of activating agent concentration on the properties of activated carbon is systematically investigated by synthesizing a series of samples via chemical activation and carbonization of the biopolymer, phytagel, using zinc chloride (ZnCl₂) as the activating agent. Five different samples of activated carbons are prepared by using the phytagel to ZnCl₂ w/w ratio in 1:0, 1:1, 1:2, 1:3, and 1:4. The prepared activated carbons are characterized using different characterization tools such as XRD, Raman, BET, SEM, TEM, EDX, XPS, etc. To study the practical application, all the activated carbons are used to fabricate solid-state supercapacitors, which are further characterized using EIS, CV, and GCD in a two-electrode geometry. The activated carbon with phytagel to ZnCl₂ w/w ratio 1:3 shows the highest specific capacitance of 129 F g⁻¹ at 0.5 A g⁻¹ and an energy density of 17.9 Wh kg⁻¹ at a power density of 974 W kg⁻¹.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 101055"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Innovative urea sensor: Pt/Graphene/Copper electrode via laser and drop casting techniques","authors":"Hassan H. Hammud ,&nbsp;Chawki Awada ,&nbsp;Waleed A. Aljamhi ,&nbsp;Stefano Boscarino ,&nbsp;Antonino Scandurra ,&nbsp;Francesco Ruffino","doi":"10.1016/j.jsamd.2025.101021","DOIUrl":"10.1016/j.jsamd.2025.101021","url":null,"abstract":"<div><div>A novel nanostructured electrode has been developed for the sensitive electrochemical determination of urea. Ligand-free platinum nanoparticles averaging 10 nm in size were synthesized via pulsed laser ablation of a Pt target submerged in water (PLAL). These nanoparticles were drop-cast onto single-layer graphene (Gr) supported on a copper substrate, resulting in the Pt/Gr/Cu electrode. The modified electrode was integrated into a three-electrode electrochemical cell for urea determination at low concentrations. Voltametric mode revealed a detection limit of 0.5 mM, with a 0.5–10 mM linearity response region and a 0.1238 mA mM⁻¹ cm⁻² sensitivity. Measurements using the impedimetric mode by electrochemical impedance spectroscopy (EIS) further validated these findings, yielding a sensitivity of 0.0217 mM⁻¹ cm⁻² within the concentration range of 1–8 mM and confirming the detection limit of 0.5 mM.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 101021"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sustainable ceramics for gamma-ray protection applications, employing inexpensive natural clay and recycled glass waste","authors":"H.M. Alsafi ,&nbsp;Mohammad W. Marashdeh ,&nbsp;O.L. Tashlykov ,&nbsp;Kholoud J. Sandougah ,&nbsp;K.A. Mahmoud","doi":"10.1016/j.jsamd.2025.101027","DOIUrl":"10.1016/j.jsamd.2025.101027","url":null,"abstract":"<div><div>The current study aims to utilize the recycled waste glass powder and natural clay to develop a novel, cost-effective ceramic material suitable for γ-ray shielding applications. The ceramic composites were fabricated according to the chemical formula of (85-y) clay + 15 wt% boric acid (H₃BO₃) + y glass waste, where y = 0, 10, 15, 20, 35, and 50 wt%. The impact of partially substituting of glass waste for the natural clay on the structural and γ-ray shielding properties is investigated experimentally. The minerals that mainly constitute the synthesized ceramics were determined using the X-ray diffractometer. Thereafter, the changes in the functional groups within the prepared material, resulting from increasing the glass waste concentration, were evaluated using the Fourier transform infrared spectroscopy. Additionally, the addition of the glass waste to the fabricated ceramics samples increases their porosity, pore volume, and water absorption factor, while their density decreases, as determined by the experimental measurements. Furthermore, the experimental measurements for the shielding properties using the NaI (Tl) detector show that the increase in recycled glass waste dopant concentration from 0 to 50 wt% decreases the linear attenuation coefficient from 0.552 cm⁻¹ to 0.504 cm⁻¹. The fall in the linear attenuation coefficient leads to a decline in the radiation protection efficacy of 10 cm thickness of the manufactured ceramics from 71.39 % to 69.85 % as the concentration of recycled glass trash increases from 0 to 50 wt% at 0.662 MeV.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 101027"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145362117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Irradiated D32DMBC crystals: Growth, characterization, and applications in optics, sensing, and phase-matching","authors":"G.S. Gayathri ,&nbsp;M. Meena ,&nbsp;Mohamed Abbas ,&nbsp;K. SenthilKannan","doi":"10.1016/j.jsamd.2025.100994","DOIUrl":"10.1016/j.jsamd.2025.100994","url":null,"abstract":"<div><div>The Diethyl 3,3′-[(2,4-dichlorophenyl) methylidene]bis(1H-indole-2-carboxylate) – (D32DMBC) crystals are grown by the slow evaporation solution growth method with 94 % yield. The D32DMBC crystal compound is a colorless block-like crystal with good quality; the single crystal XRD data confirms the monoclinic type and the space group as P2₁/c. The D32DMBC crystalline functional group is confirmed by FTIR spectrum and the cut-off wavelength of different scaling is observed from the absorption spectrum by the Cobalt-60 source for gamma-irradiation gives D32DMBC-100Gy is 343 nm, D32DMBC-500Gy is 345 nm, D32DMBC-5000Gy is 346 nm and D32DMBC-10000Gy is 348 nm. The Tauc’s plot represents the band gap value of D32DMBC crystal for different scaling is 3.6 eV, 3.59 eV, 3.58 eV, 3.56 eV, and 3.54 eV the SHG-NLO efficiency of the D32DMBC in different scales such as pure, 100Gy, 500Gy, 5000Gy, and 10000Gy are 1.16, 1.17, 1.18, 1.24, and 1.29 times that of KDP, and phase matching effectiveness also increased manner. The D32DMBC is double the input frequency for D32DMBC-100Gy, D32DMBC-500Gy, D32DMBC-5000Gy, and D32DMBC-10000Gy in the BAT-62 diode, compared to the pure D32DMBC crystal. The thermal studies of the DTA and TGA values of D32DMBC-100Gy are 148^oC and 144^oC is observed, D32DMBC-100Gy crystal shows a sharp peak representing a better crystalline nature and it is 75 % entirely decomposed after 197^oC. The variation of pure D32DMBC and D32DMBC-100Gy is 1^oC. The room temperature-based red LED glow of the temperature sensor is in % as 9, 7, 8, and 1 for D32DMBC-100Gy, D32DMBC-500Gy, D32DMBC-5000Gy, and D32DMBC-10000Gy and 100 Gy, is preferred as the highest %.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 100994"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Lanthanide elements doped IZO semiconductor targets sputtered thin films as channel layers in high mobility thin film transistors","authors":"Bingxue Han ,&nbsp;Hua Xu ,&nbsp;Lijia Chen ,&nbsp;Chongyang Chen ,&nbsp;Bin Wu ,&nbsp;Lei Wang ,&nbsp;Zhijun Wang ,&nbsp;Benshuang Sun ,&nbsp;Jilin He","doi":"10.1016/j.jsamd.2025.100992","DOIUrl":"10.1016/j.jsamd.2025.100992","url":null,"abstract":"<div><div>Three novel rare-earth-doped indium-zinc oxide (RE-IZO) semiconductor targets, specifically PrIZO, NdIZO, and TbIZO, were synthesized via a defect-engineered sintering process. These targets were subsequently employed in magnetron sputtering to deposit high-mobility thin films, which functioned as channel layers in thin-film transistors (TFTs). Firstly, the mechanism of doping elements' influence on the phase regulation and grain refinement of these three targets during the densification process was systematically investigated, combined with first-principles calculations. The formation of PrInO₃ and NdInO₃ secondary phases during sintering significantly enhanced grain boundary migration resistance. This phenomenon stemmed from the significant mismatch in ionic radii between Pr³⁺ (0.99 Å)/Nd³⁺ (0.98 Å) and In³⁺(0.80 Å), which exceeded the mismatch in ionic radii between Tb³⁺ (0.92 Å) and In³⁺. The results showed that the densities of PrIZO and NdIZO targets were 99.7 % and 99.8 %, respectively, with grain sizes of 2.6 μm and 3.9 μm, and electrical conductivities of 2.2 mΩ cm and 5.2 mΩ cm, respectively, outperforming TbIZO target (density 95.1 %, grain size 4.4 μm, resistivity 8.1 mΩ cm). Subsequently, amorphous-structured, ultra-smooth-surface (R_a &lt; 0.5 nm), and highly uniform PrIZO, NdIZO, and the TbIZO transparent conductive films were prepared via optimized magnetron sputtering. As channel layers for thin-film transistors (TFTs), these films exhibit excellent electrical properties: <em>I</em>_on/<em>I</em>_off &gt;0.9, <em>μ</em>_sat &gt;21 cm²/V·s, threshold voltage &lt;2 V, and subthreshold swing &lt;0.3 V/dec. NdIZO TFTs exhibit the smallest threshold voltage shift (ΔV_th = 0.6 V) under positive bias stress (PBS), demonstrating excellent bias stability. The results showed that the better the overall performance of the targets, the better the performance of the TFT devices. This work provided an effective research strategy for developing channel layer materials for high-performance TFT devices.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 100992"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145105148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of structural and optoelectronic properties in dye-doped MC biopolymer films","authors":"Hawkar A. Mohammed ,&nbsp;Ismael I. Hussein ,&nbsp;Govar H. Hamasalih ,&nbsp;Ahmed G.S. Al-Azzawi ,&nbsp;Pshko A. Mohammed ,&nbsp;Sameerah I. Al-Saeedi ,&nbsp;Shujahadeen B. Aziz ,&nbsp;Jamal Hassan","doi":"10.1016/j.jsamd.2025.100968","DOIUrl":"10.1016/j.jsamd.2025.100968","url":null,"abstract":"<div><div>Biodegradable polymers modified with natural additives are gaining increasing attention for sustainable optoelectronic applications. In this work, a natural dye extracted from Cosmos sulphureus Cav. (CSC) flowers was incorporated into methylcellulose (MC) biopolymer films via a casting technique to enhance their optical properties. The dye-doped MC films were characterized to evaluate structural, morphological, and optical changes using established spectroscopic and imaging techniques. FTIR analysis confirmed strong hydrogen bonding between MC and CSC functional groups, primarily involving OH and NH groups. This interaction suggests good chemical compatibility and uniform dispersion of the dye within the polymer matrix. XRD results revealed an increased amorphous phase in doped samples, with a significant decrease in crystallinity, corroborated by a rise in Urbach energy from 0.327 to 0.463 eV. SEM imaging revealed distinct changes in surface morphology, with the dye-doped films exhibiting increased roughness and varied surface features compared to the smooth texture of the pristine MC, indicating effective dye incorporation and microstructural interaction. UV–Visible spectroscopy showed a red-shift in the absorption edge from 6.3 eV in pure MC to 2.24 eV in the highest doped sample (MCCS3), indicating effective band gap reduction. The refractive index increased from 1.15 to 1.18 with dye loading, indicating a denser optical medium and increased electronic polarizability. Simultaneously, the optical electronegativity decreased from 2.171 to 2.157, suggesting greater ease of electronic transitions. Optical dispersion parameters were analyzed using the Wemple-DiDomenico (WDD) model, oscillator energy (<span><math><mrow><msub><mi>E</mi><mi>o</mi></msub></mrow></math></span>) dropped from 6.26 to 2.63 eV and dispersion energy (<span><math><mrow><msub><mi>E</mi><mi>d</mi></msub></mrow></math></span>) from 1.54 to 0.71 eV. Other derived parameters such as effective mass, plasma frequency, mobility, and Verdet constants support the suitability of the films for optical limiting and magneto-optical applications. This study presents a novel, eco-friendly approach to tailoring the optical properties of biodegradable polymers, offering low-cost, sustainable solutions for future green technologies.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 100968"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145026856","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon Quantum Dot Derived from the Extracted Natural Dye of Hybrid Poplar Waste Leafs as an Original Progress to Enhance the Optical Properties of PVA Polymer: Solvothermal Synthesis and Spectroscopic Characterization","authors":"Krmanj R. Ali ,&nbsp;Dyari M. Mamand ,&nbsp;Ary R. Murad ,&nbsp;Ismael I. Huseen ,&nbsp;Dara M. Aziz ,&nbsp;Kawan F. Kayani ,&nbsp;Sameerah I. Al-Saeedi ,&nbsp;Shujahadeen B. Aziz ,&nbsp;Jamal Hassan","doi":"10.1016/j.jsamd.2025.101009","DOIUrl":"10.1016/j.jsamd.2025.101009","url":null,"abstract":"<div><div>This research demonstrates a green and facile single-step solvothermal method for the synthesis of carbon quantum dots (CQDs) using natural dye obtained from hybrid poplar (HP) leaf waste. The prepared CQDs were thoroughly characterized by FTIR, ¹H and ¹³C NMR, UV–Vis absorption, and fluorescence emission spectroscopies. These spectroscopic techniques confirm the presence of abundant functional groups (–OH, –COOH, –C=O) on the surface of CQDs. These CQDs were subsequently incorporated into a polyvinyl alcohol (PVA) matrix to fabricate nanocomposite films and examine their impact on the structural, optical, and optoelectronic properties of the PVA polymer. X-ray diffraction (XRD) analysis revealed a gradual reduction in the crystallinity of PVA with increasing CQD content, indicating a disruption of polymer chain ordering and the formation of more amorphous phases. The integration of CQDs induced a progressive red-shift in the absorption spectra and significantly reduced the direct optical bandgap from 6.35 to 2.87 eV and the indirect optical bandgap from 5.85 to 2.5 eV, as estimated from Tauc plots. The Wemple–DiDomenico (W-DD) single oscillator model further confirmed enhanced interband electronic transitions, as evidenced by an increase in dispersion energy (<em>E</em>_<em>d</em>) from 0.343 to 0.911 eV and a concurrent decrease in oscillator energy (<em>E</em>_<em>o</em>) from 5.817 to 2.601 eV with increasing CQD concentration. Furthermore, the nanocomposite films exhibited markedly improved nonlinear optical (NLO) performance. Third-order nonlinear susceptibility (χ³) increased by more than three orders of magnitude, from 9.74× 10⁻¹⁷ to 1.32 × 10⁻¹³ <em>esu</em>, while the nonlinear refractive index (<em>n2</em>) rose from 0.027 to 0.167. These results were accompanied by enhancements in dielectric constants, refractive index, plasma frequency (from 2.89 × 10¹⁵ to 3.78 × 10¹⁵ rad/s), effective carrier concentration (from 2.90 × 10⁵⁷ to 4.96 × 10⁵⁷), and Fermi energy (from 0.698 to 0.997 eV), indicating a significant modification in charge carrier dynamics and light–mater interactions within the PVA matrix.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 101009"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145332703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced photocatalytic degradation of antibiotics and dye using flower-like BiOBrxI1-x solid solutions formed from self-assembled nanosheets","authors":"Shulan Pu ,&nbsp;Dongying Wang ,&nbsp;Xi Luo ,&nbsp;Yuhong Ding ,&nbsp;Jianglong Guo ,&nbsp;Yaxiong Li ,&nbsp;Jin Zhong Zhang ,&nbsp;Yan Sun","doi":"10.1016/j.jsamd.2025.101051","DOIUrl":"10.1016/j.jsamd.2025.101051","url":null,"abstract":"<div><div>Flower-like BiOBr_xI_1-x solid solutions with varying Br/I ratios were successfully prepared via a facile precipitation method. The photocatalytic performance was evaluated by degrading representative pollutants, including tetracycline (TC), oxytetracycline (OTC), and rhodamine B dye (RhB). All solid solutions exhibited enhanced activity compared to pure BiOBr and BiOI, and BiOBr_0.5I_0.5 demonstrated the highest degradation efficiencies of 81.7 %, 76.4 %, and 98.5 % for TC, OTC, and RhB within 30 min, respectively. The formation of a solid solution altered the band structure and provided multiple active sites for photocatalytic reaction, thus accelerating the separation of charge carriers. Moreover, the main active species were revealed through capture experiments and electron spin resonance tests.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 101051"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel Z-scheme CoWO4/RGO/g-C3N4 photocatalyst for efficient visible-light-induced removal of organic pollutants","authors":"Dang Van Do ,&nbsp;Hung Van Tran ,&nbsp;Giang Dac Truong Nguyen ,&nbsp;Long Van Dang ,&nbsp;Son Thanh Le ,&nbsp;Khai Manh Nguyen ,&nbsp;Trang Thu Hoang ,&nbsp;Phuong Minh Nguyen","doi":"10.1016/j.jsamd.2025.101056","DOIUrl":"10.1016/j.jsamd.2025.101056","url":null,"abstract":"<div><div>A ternary CoWO₄/RGO/g-C₃N₄ photocatalyst was synthesized via a facile hydrothermal method for visible-light-driven degradation of the azo dye Direct Blue 71 (DB 71). Structural, morphological, and optical characterizations (XRD, FT-IR, SEM, EDS, UV–Vis DRS, and PL) confirmed the uniform incorporation of CoWO₄ and reduced graphene oxide (RGO) into the g-C₃N₄ framework, resulting in enhanced visible-light absorption and suppressed charge recombination through an RGO-mediated Type-II heterojunction. The optimized 0.1CoWO₄/RGO/g-C₃N₄ composite achieved 97 % degradation and 73 % TOC removal within 40 min, following pseudo-first-order kinetics (k = 0.08546 min^-1). Behnajady–Modirshahla–Ghanbary (BMG) modeling yielded b = 0.79875 min^-1 and m = 1.265, confirming high oxidative capacity. Photocatalytic activity was optimal at acidic to neutral pH and moderate catalyst dosage, with •OH and h⁺ identified as the dominant reactive species. The catalyst maintained 89 % efficiency after six cycles and achieved 54–74 % TOC removal in real urban surface waters from Hanoi. A preliminary techno-economic analysis estimated a production cost of 15–40 USD·kg^-1, underscoring its scalability and economic viability for sustainable wastewater treatment.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 101056"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145620592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and analysis of 3D stacked nanosheet-based capacitorless DRAM with separated storage regions under process variations","authors":"Soo Bean Song ,&nbsp;Jin Park ,&nbsp;Won Suk Koh ,&nbsp;Gang San Yun ,&nbsp;Kyeong Min Lim ,&nbsp;Jaewon Jang ,&nbsp;Jin Hyuk Bae ,&nbsp;Sang Ho Lee ,&nbsp;Young Jun Yoon ,&nbsp;In Man Kang","doi":"10.1016/j.jsamd.2025.101047","DOIUrl":"10.1016/j.jsamd.2025.101047","url":null,"abstract":"<div><div>Conventional one-transistor–one-capacitor (1T–1C) dynamic random-access memory (DRAM) faces significant challenges in achieving high integration and cell-area scaling due to physical limitations in maintaining the size and shape of the cell capacitor. As device scaling progresses, securing sufficient capacitance becomes increasingly difficult, necessitating the fabrication of high–aspect-ratio capacitors. This requirement, in turn, increases process complexity and manufacturing cost. To address these limitations, this study proposes a gate-all-around (GAA) nanosheet (NS)–based capacitorless DRAM (1T-DRAM) structure, in which the current conduction path and the hole storage region are physically separated. The proposed device was evaluated through simulations that examined structural variations, such as taper angle and Si edge rounding induced by vertical stacking and etching, as well as electrical disturbances during memory array operation to assess device reliability. Simulation results indicate that smaller taper angles and increased Si edge rounding reduce the effective channel width, leading to an increased sensing margin (SM) but a decreased retention time (RT). This behavior is attributed to variations in stored hole density. The proposed structure also shows heightened sensitivity to taper angle variation, underscoring the importance of precise reactive-ion etching (RIE) control. Furthermore, under electrical array disturbance conditions, the proposed 1T-DRAM maintains stable operation, exhibiting variations of less than ±2 % in SM and ±6 % in RT, demonstrating its robustness. These findings highlight the potential of the proposed architecture for realizing highly integrated and reliable memory devices.</div></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"10 4","pages":"Article 101047"},"PeriodicalIF":6.8,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145575877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}