Materials Today Physics最新文献

{"title":"Module-scale silicon 3D softened nanoarchitectures for eco-friendly thermoelectric energy harvesting","authors":"Ryohei Nagahiro ,&nbsp;Bin Xu ,&nbsp;Shingo Terashima ,&nbsp;Yifei Li ,&nbsp;Yuanzhe Li ,&nbsp;Yuxuan Liao ,&nbsp;Zhenglong Fang ,&nbsp;Cheng Shao ,&nbsp;Masato Ohnishi ,&nbsp;Shinya Kato ,&nbsp;Eiji Iwase ,&nbsp;Junichiro Shiomi","doi":"10.1016/j.mtphys.2025.101798","DOIUrl":"10.1016/j.mtphys.2025.101798","url":null,"abstract":"<div><div>Widespread of internet-of-things with wireless sensing and transmission devices require self-powering module consisting of abundant and environmental-friendly materials. Si thermoelectric material is a promising candidate and sufficient figure of merit (<span><math><mrow><mi>z</mi><mi>T</mi></mrow></math></span>) has been realized in the form of nanoscale derivatives. However, scaling it up to bulk material while maintaining the <span><math><mrow><mi>z</mi><mi>T</mi></mrow></math></span> has been challenging. This difficulty arises from the lack of scalable nanostructures that effectively impede phonon transport without significantly sacrificing electron transport in the bulk process, which is rooted in the intrinsic trade-off between electrical and thermal transport mechanisms. To overcome this limitation, this study introduces a scalable 3D softened nanoarchitecture by a highly non-equilibrium sintering process, featuring narrow-conduction path between nanograins, which facilitates selective electron/phonon interface transmission due to the induced significant strain. This strain engineering results in remarkable <span><math><mrow><mi>z</mi><mi>T</mi></mrow></math></span> values for both n- and p-type bulk 3D Si nanoarchitectures (0.11–0.23 at room temperature and 0.44–0.67 about 750 K), which are 5–10 times those of previously reported bulk nanostructured Si materials. The superior <span><math><mrow><mi>z</mi><mi>T</mi></mrow></math></span> and scalability enables integrating the Si thermoelectric materials into a flexible module and realized powering wireless sensor devices for 24 h.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"57 ","pages":"Article 101798"},"PeriodicalIF":10.0,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144612973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent progress on flexible tactile sensors: From microstructural design to intelligent sensing applications","authors":"Tong Li,&nbsp;Ling-Feng Liu,&nbsp;Dan Zhang,&nbsp;Xin-Gui Tang,&nbsp;Qi-Jun Sun","doi":"10.1016/j.mtphys.2025.101793","DOIUrl":"10.1016/j.mtphys.2025.101793","url":null,"abstract":"<div><div>Recently, the rising wearable tactile sensing technology has made significant advances in personal health monitoring, rehabilitation and smart sports. Particularly, the microstructured tactile sensors with high sensitivity and fast response are becoming excellent candidates for mimicking the perception capabilities of human skin for wearable electronics. Herein, the working principles, and device construction techniques of diverse microstructured tactile sensors are firstly introduced and discussed. After that, their applications in health monitoring and smart sports are presented. Finally, the remaining challenges and potential solutions of microstructured tactile sensors are discussed. This review aims to provide valuable insights and potential innovations in this rapidly evolving field.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"57 ","pages":"Article 101793"},"PeriodicalIF":10.0,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144612972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rapid analysis of point-contact Andreev reflection spectra via machine learning with physics-guided data augmentation","authors":"Dongik Lee ,&nbsp;Valentin Stanev ,&nbsp;Xiaohang Zhang ,&nbsp;Mijeong Kang ,&nbsp;Ichiro Takeuchi ,&nbsp;Seunghun Lee","doi":"10.1016/j.mtphys.2025.101792","DOIUrl":"10.1016/j.mtphys.2025.101792","url":null,"abstract":"<div><div>Delineating the superconducting order parameters is a pivotal task in investigating superconductivity for probing pairing mechanisms, as well as their symmetry and topology. Point-contact Andreev reflection (PCAR) measurement is a simple yet powerful tool for identifying the order parameters. The PCAR spectra exhibit significant variations depending on the type of the order parameter in a superconductor, including its magnitude (<em>Δ</em>), as well as temperature, interfacial quality, Fermi velocity mismatch, and other factors. The information on the order parameter can be obtained by finding the combination of these parameters, generating a theoretical spectrum that fits a measured experimental spectrum. However, due to the complexity of the spectra and the high dimensionality of parameters, extracting the fitting parameters is often time-consuming and labor-intensive. In this study, we employ a convolutional neural network (CNN) algorithm to create models for rapid and automated analysis of PCAR spectra of various superconductors with different pairing symmetries (conventional <em>s</em>-wave, chiral <span><math><mrow><msub><mi>p</mi><mi>x</mi></msub><mo>+</mo><mi>i</mi><msub><mi>p</mi><mi>y</mi></msub></mrow></math></span>-wave, and <span><math><mrow><msub><mi>d</mi><mrow><msup><mi>x</mi><mn>2</mn></msup><mo>‐</mo><msup><mi>y</mi><mn>2</mn></msup></mrow></msub></mrow></math></span>-wave). The training datasets are generated based on the Blonder-Tinkham-Klapwijk (BTK) theory and further modified and augmented by selectively incorporating noise and peaks according to the bias voltages. This approach not only replicates the experimental spectra but also brings the model's attention to important features within the spectra. The optimized models provide fitting parameters for experimentally measured spectra in less than 100 ms per spectrum. Our approaches and findings pave the way for rapid and automated spectral analysis which will help accelerate research on superconductors with complex order parameters.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"57 ","pages":"Article 101792"},"PeriodicalIF":10.0,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144594745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Revolutionizing wettability regulation with advanced numerical simulation","authors":"Haotian Chen ,&nbsp;Xiaohu Xia ,&nbsp;Haidong Yu ,&nbsp;Yuchao Xu ,&nbsp;Aoke Jiang ,&nbsp;Hai Zhu ,&nbsp;Bingsuo Zou ,&nbsp;Yabin Zhang","doi":"10.1016/j.mtphys.2025.101782","DOIUrl":"10.1016/j.mtphys.2025.101782","url":null,"abstract":"<div><div>Significant advancements in micro/nanotexturing design, theoretical calculation, and functional modification enable the wettability design to find wide applications in various fields. However, existing studies primarily focus on the realization of desired wettability through trial-and-error structure optimization, with little attention paid to the interior theoretical association of wettability with structures to predict wetting behaviors. With the extensive application of numerical simulations across the fields, the simulation of static or dynamic wetting behaviors of droplets on surfaces with multiple-scale structures is boosting in-depth understanding of surface wettability behaviors, offering sustainable solutions in future surface wettability design and applications. To this end, this review provides latest advancements in contributions of numerical simulation to wettability design on micro/nanostructuring surfaces. It begins with fundamental wetting theory on smooth surfaces, then evolving from rough ones to complex micro/nano-textured ones that is crucial for regulating wetting on various real surfaces and even interfaces. Afterwards, static and dynamic simulations for tuning wetting behaviors from both macroscopic and microscopic perspectives are summarized. Remaining challenges in the deployment of numerical simulations for wettability design on the texturing surfaces are finally discussed and analyzed to offer prospects for future development and motivate innovation within the field.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"57 ","pages":"Article 101782"},"PeriodicalIF":10.0,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144565860","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anisotropic suppression of phonon thermal transport in polycrystalline layered materials","authors":"Guanda Quan ,&nbsp;Zhenguo Zhu ,&nbsp;Shuo Bai ,&nbsp;Te-Huan Liu ,&nbsp;Ronggui Yang ,&nbsp;Xin Qian","doi":"10.1016/j.mtphys.2025.101781","DOIUrl":"10.1016/j.mtphys.2025.101781","url":null,"abstract":"<div><div>Heat conduction in layered materials is of both fundamental and applicational significance, but the anisotropic phonon transport in polycrystalline layered materials is not well understood because isotropic grain boundary scattering is usually assumed when solving the Boltzmann transport equation (BTE). This work presents an analytical solution of BTE that captures the anisotropic suppression of phonon mean free paths, detailed phonon transmission across grain interfaces, and nonequilibrium phonon populations in polycrystalline layered materials, along both in-plane and out-of-plane directions. Our theory is examined on polycrystalline graphite by comparing grain-size-dependent thermal conductivity with molecular dynamics simulations and pump-probe measurements. We find that naively adding boundary scattering rates using Matthiessen's rule fails to capture the grain-size dependence of both in-plane and out-of-plane thermal conductivities, while the Kapitza resistance of grain boundaries must be included in the suppression function. In addition, nonequilibrium phonon populations incident onto grain boundaries contribute significantly to mean-free-path suppression for grain sizes over ∼300 nm in both the in-plane and the cross-plane directions, without which the thermal conductivity can be overestimated by 30∼40 %. These results provide a useful analytical framework for quantitative modeling of the anisotropic interaction between phonons and grain boundaries in layered materials.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"57 ","pages":"Article 101781"},"PeriodicalIF":10.0,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144565863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High-performance self-powered UV-to-NIR imaging photodetector based on Bi2Te3 p-n homojunction","authors":"Yinze Zhang ,&nbsp;Wen He ,&nbsp;Dongbo Wang ,&nbsp;Chenchen Zhao ,&nbsp;Yanghao Bi ,&nbsp;Xiangqian Fan ,&nbsp;Lei Chen ,&nbsp;Wei Wu ,&nbsp;Xuan Fang ,&nbsp;Gang Liu ,&nbsp;Liancheng Zhao ,&nbsp;Jinzhong Wang","doi":"10.1016/j.mtphys.2025.101779","DOIUrl":"10.1016/j.mtphys.2025.101779","url":null,"abstract":"<div><div>2D Bi₂Te₃ is an emerging semiconducting materials show considerable promise for application in the development of next-generation optoelectronic devices. Especially, broadband photodetection is crucial in various applications, including multispectral imaging and cognition. Therefore, tuning the physical properties of semiconductors and thereby building an efficient p-n homojunction are important for achieving a high-performance photodetection device. However, until now, it is still difficult to construct Bi₂Te₃ p-n homojunction. In this work, Sb-doped Bi₂Te₃ was synthesized via chemical vapor deposition, which exhibited typical p-type conduction behavior and a considerable hole mobility of 1.6 cm² V⁻¹ s⁻¹. Benefiting from the built-in electric field, the Bi₂Te₃ p-n homojunction displays an apparent rectification effect and an extremely low dark current of approximately 10⁻¹⁴ A. Under illumination, the p-n homojunction, serving as a photodiode, achieved a high power conversion efficiency of 4.65 % and an excellent responsivity of 802.9 A/W. Furthermore, taking advantage of the built-in electric field, the p-n homojunction exhibited broadband self-driving photodetection from 367 to 1550 nm with ultra-high detectivity (3.84 × 10¹³ Jones at 520 nm and 8.82 × 10¹¹ Jones at 1550 nm). This work provides an effective strategy for synthesizing p-type Bi₂Te₃ and emphasizes the pivotal role of homojunctions for high-performance broadband photodetectors.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"56 ","pages":"Article 101779"},"PeriodicalIF":10.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rattling-induced effects of Ag atoms and anomalous phonon transport along with thermoelectric performance in silver-based chalcopyrite AgGaX2 (X = Se, Te)","authors":"Shuangshuang Luan ,&nbsp;Yinchang Zhao ,&nbsp;Jun Ni ,&nbsp;Zhenhong Dai","doi":"10.1016/j.mtphys.2025.101769","DOIUrl":"10.1016/j.mtphys.2025.101769","url":null,"abstract":"<div><div>A comprehensive elucidation of phonon transport mechanisms is imperative for the rational design of advanced thermoelectric materials exhibiting intrinsically low lattice thermal conductivity. In this work, the thermal and electrical transport behaviors of AgGaX<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> (X = Se, Te) are comprehensively explored through self-consistent phonon calculations, compressive sensing techniques, and the Boltzmann transport equation. The ultralow lattice thermal conductivity (<span><math><msub><mrow><mi>κ</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span>) of AgGaX<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> is attributed to the strong anharmonicity due to the rattling modes of Ag atoms, strong phonon scattering due to the strong coupling between acoustic and low-frequency optical phonon branches, and the unusually high contribution of optical phonons to thermal conductivity. We also find that the <span><math><msub><mrow><mi>κ</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span> of AgGaX<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> (X = Se, Te) exhibits an anomalous trend compared to the conventional mass trend, with <span><math><msub><mrow><mi>κ</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span> decreasing when the lighter Se atoms replace Te atoms. This anomalous phonon transport behavior is attributed to the weaker Ag–Se bonding strength, lower avoided crossing frequency, and the dominant contribution of optical phonons to <span><math><msub><mrow><mi>κ</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span> (exceeding 60%) in AgGaSe<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>. The high band degeneracy and strong dispersion near the valence band maximum (VBM) result in a high power factor (<span><math><mrow><mi>P</mi><mi>F</mi></mrow></math></span>), which, combined with the ultralow <span><math><msub><mrow><mi>κ</mi></mrow><mrow><mi>L</mi></mrow></msub></math></span>, leads to excellent thermoelectric performance. Accounting for multiple scattering processes, the peak <span><math><mrow><mi>Z</mi><mi>T</mi></mrow></math></span> values of p-type AgGaSe<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> and AgGaTe<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> are predicted to attain 2.53 and 2.71 at 700 K, respectively. The inclusion of spin–orbit coupling (SOC) causes the peak <span><math><mrow><mi>Z</mi><mi>T</mi></mrow></math></span> values to decrease to 1.99 and 2.14, representing decreases of 22.1% and 21%, respectively. These results indicate that AgGaX<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> is a promising class of high performance thermoelectric materials, and its unique phonon dynamics and electron transport properties make it promising for thermoelectric applications.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"56 ","pages":"Article 101769"},"PeriodicalIF":10.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stretchable one-dimensional flexible capacitive sensor with high stability and large strain for human vital signal monitoring prepared by water-bath electrospinning technology","authors":"Xiaohu Wang ,&nbsp;Mengjing Fan ,&nbsp;Anna Bao ,&nbsp;Xiao Han ,&nbsp;Jianhan Hong","doi":"10.1016/j.mtphys.2025.101778","DOIUrl":"10.1016/j.mtphys.2025.101778","url":null,"abstract":"<div><div>The large-scale three- and two-dimensional structures of traditional textile-based flexible capacitive sensors, along with their pressure-dominated sensing mechanisms and monitoring applications, have constrained the development of these sensors in the field of human physiological signal monitoring. To develop stretchable one-dimensional flexible capacitive sensors (SOFCS) with broader application fields, more flexible structural designs, and enhanced implantability, this study employed an improved multi-needle water bath electrospinning method to prepare polyacrylonitrile (PAN) nanofiber-coated silver-plated nylon (SPN) core-spun yarns (NFCY). Utilizing these yarns as raw materials (serving as both electrodes and dielectric layers), a stretchable one-dimensional flexible capacitive sensor achieving a strain of up to 70 % was constructed and applied for monitoring human motion and vital signs. Research results demonstrate that electrode composition, carrier diameter, and electrode winding density significantly affect sensor performance. The optimized sensor exhibits high sensitivity (maximum <em>GF</em> 2.04), maintains stable capacitive responses under varying strains and stretching speeds, demonstrates strong robustness to deformation velocity, and shows excellent durability and repeatability. This sensor can effectively monitor joint movements, posture, respiration, and speech signals, maintaining reliable sensing performance when integrated into garments. It demonstrates significant potential for development in the field of electronic textiles for health monitoring applications.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"56 ","pages":"Article 101778"},"PeriodicalIF":10.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144534050","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Cu–Ru pair site drives efficient nitrate electroreduction to ammonia in neutral media","authors":"Qing Li ,&nbsp;Qian Zhou ,&nbsp;Yong Zhang ,&nbsp;Zhihong He ,&nbsp;Dongyang Li ,&nbsp;Fang Yu ,&nbsp;Haiqing Zhou","doi":"10.1016/j.mtphys.2025.101783","DOIUrl":"10.1016/j.mtphys.2025.101783","url":null,"abstract":"<div><div>Nitrate reduction reaction (NO₃RR) enables sustainable ammonia production by electrochemically converting nitrate pollutants in wastewater, presenting a dual-benefit strategy for resource recovery and environmental protection. However, this process is complex, involving coordination between various reaction intermediates of nitrate reduction and active hydrogen (∗H) species derived from water dissociation. In this work, we deigned a tandem catalyst of Cu-Ru@NF to realize the relay catalysis of NO₃RR, in which Cu facilitates NO₃⁻ adsorption/conversion to NO₂⁻ and Ru promotes the subsequent hydrogenation process as ∗H adsorption site. Consequently, the introduction of a trace amount of Ru atoms dramatically enhances the catalytic performance of Cu-based catalysts, exhibiting a record NH₃ yield up to 35.44 mg h⁻¹ cm⁻² at potential of −0.7 V (vs. RHE) with Faraday efficiency (FE) of 93.07 % in neutral electrolytes, ranking top-level among all reported NO₃RR catalysts. Inspired by the remarkable NO₃RR catalytic activity, a Zn-NO₃⁻ battery was constructed by utilizing Cu-Ru@NF as the cathode, demonstrating a maximum power density of up to 7 mW cm⁻². This study would provide a new avenue for designing catalysts in reactions that involve multi-electron redox processes and multi-step reaction pathways.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"56 ","pages":"Article 101783"},"PeriodicalIF":10.0,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144563092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"High figure-of-merit in Zn, Sb co-doped Mg2Si0.3Sn0.7 alloy through simultaneous optimization of electrical and thermal transports","authors":"Pritam Sarkar ,&nbsp;Pankaj Gupta ,&nbsp;U. Sandhya Shenoy ,&nbsp;Surjeet Singh ,&nbsp;Sayandeep Kundu ,&nbsp;Nitin Kumawat ,&nbsp;Dinesh Kumar Kedia ,&nbsp;D. Krishna Bhat ,&nbsp;Shovit Bhattacharya ,&nbsp;Ajay Singh","doi":"10.1016/j.mtphys.2025.101776","DOIUrl":"10.1016/j.mtphys.2025.101776","url":null,"abstract":"<div><div>The derivatives of Mg₂Si have recently attracted wide attention as promising thermoelectric materials due to earth abundant and environment friendly low-cost constituents. The main challenge in optimizing the thermoelectric figure of merit <em>ZT</em>, is the low electrical and high thermal conductivities of Mg₂Si. The present study demonstrates high <em>ZT</em> of ∼1.55 at 673 K in Mg₂Si_0.3Sn_0.7 through simultaneous optimization of electrical and thermal transport through Sb and Zn co-doping. The ultra-low deformation and alloy scattering potentials in Sb and Zn co-doped samples helps in maintaining record high Hall mobility ∼70–90 cm²/V.s. The doping induced pudding mold band structure with hyperconvergence in conduction band balances high Seebeck coefficient and high electrical conductivity. The point defects and dislocations created by doping helps in lowering of lattice thermal conductivity as well. The uni-leg power generator fabricated using optimized Mg_1.96Zn_0.04(Si_0.3Sn_0.7)_0.98Sb_0.02 exhibits a record efficiency of ∼9.5 % at Δ<em>T</em> ∼ 329 K.</div></div>","PeriodicalId":18253,"journal":{"name":"Materials Today Physics","volume":"57 ","pages":"Article 101776"},"PeriodicalIF":10.0,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}