Multi-component chalcogenidometalates have garnered significant attention due to their promising applications in solar energy conversion devices,including photodetectors,solar cells,and photocatalysts.Photocurrent res...Multi-component chalcogenidometalates have garnered significant attention due to their promising applications in solar energy conversion devices,including photodetectors,solar cells,and photocatalysts.Photocurrent response is not only a fundamental property of photodetectors but also serves as a key indicator of the solar energy conversion efficiency in potential semiconductor devices.Despite the growing interest,a clear and universal guideline for designing chalcogenide materials with excellent photocurrent response remains elusive,primarily due to the substantial variations in their chemical compositions and crystal structures.In this review,we present a comprehensive compilation of reported multi-component chalcogenidometalates,including main group chalcogenides with binary and ternary anionic frameworks,and discuss their photocurrent response performance.Additionally,we also highlight other special chalcogenide systems,focusing on their photocurrent response characteristics.For the first time,we systematically summarize the intricate relationships between chemical composition,crystal structure,electronic band structure,and photocurrent response in these materials.Finally,we believe that this review provides a valuable structural perspective on the photocurrent response of multi-component chalcogenidometalates,offering useful insights for the design and application of advanced solar energy conversion materials.展开更多
Atomic-scale polar topologies such as skyrmions offer important potential as technological paradigms for future electronic devices.Despite recent advances in the exploration of topological domains in complicated perov...Atomic-scale polar topologies such as skyrmions offer important potential as technological paradigms for future electronic devices.Despite recent advances in the exploration of topological domains in complicated perovskite oxide superlattices,these exotic ferroic orders are unavoidably disrupted at the atomic scale due to intrinsic size effects.Here,based on first-principles calculations,we propose a new strategy to design robust ferroelectricity in atomically thin films by properly twisting 2 monolayers of centrosymmetric SrTiO_(3).Surprisingly,the emerged polarization vectors curl in the plane,forming a polar skyrmion lattice with each skyrmion as small as 1 nm,representing the highest polar skyrmion density to date.The emergent ferroelectricity originates from strong interlayer coupling effects and the resulting unique strain fields with obvious ion displacements,contributing to electric polarization comparable to that of PbTiO_(3).Moreover,we observe ultraflat bands(band width of less than 5 meV)at the valence band edge across a wide range of twist angles,which show widths that are smaller than those of common twisted bilayers of 2-dimensional materials.The present study not only overcomes the critical size limitation for ferroelectricity but also reveals a novel approach for achieving atomic-scale polar topologies,with important potential for applications in skyrmion-based ultrahigh-density memory technologies.展开更多
基金supported by the National Natural Science Foundation of China(Grants No.52202142,52171277,and 22175175)the Science and Technology Serving Enterprise Project in University and Colleges of Xi’an Science and Technology Bureau(Grant No.24GXFW0002)+1 种基金the Doctoral Scientific Research Startup Foundation of Shaanxi University of Science and Technology(2018BJ-07)Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZR118).
文摘Multi-component chalcogenidometalates have garnered significant attention due to their promising applications in solar energy conversion devices,including photodetectors,solar cells,and photocatalysts.Photocurrent response is not only a fundamental property of photodetectors but also serves as a key indicator of the solar energy conversion efficiency in potential semiconductor devices.Despite the growing interest,a clear and universal guideline for designing chalcogenide materials with excellent photocurrent response remains elusive,primarily due to the substantial variations in their chemical compositions and crystal structures.In this review,we present a comprehensive compilation of reported multi-component chalcogenidometalates,including main group chalcogenides with binary and ternary anionic frameworks,and discuss their photocurrent response performance.Additionally,we also highlight other special chalcogenide systems,focusing on their photocurrent response characteristics.For the first time,we systematically summarize the intricate relationships between chemical composition,crystal structure,electronic band structure,and photocurrent response in these materials.Finally,we believe that this review provides a valuable structural perspective on the photocurrent response of multi-component chalcogenidometalates,offering useful insights for the design and application of advanced solar energy conversion materials.
基金supported by the National Natural Science Foundation of China(grant nos.12172370,12432007,12272338,12192214,and 12204496)the Natural Science Foundation of Ningbo City(grant nos.2022J295 and 2023J360)+2 种基金JSPS KAKENHI(grant nos.JP23H00159,JP23K17720,and JP20H05653)JST FOREST Program(grant no.JPMJFR222H)JSPS International Research Fellow(grant no.P22065).
文摘Atomic-scale polar topologies such as skyrmions offer important potential as technological paradigms for future electronic devices.Despite recent advances in the exploration of topological domains in complicated perovskite oxide superlattices,these exotic ferroic orders are unavoidably disrupted at the atomic scale due to intrinsic size effects.Here,based on first-principles calculations,we propose a new strategy to design robust ferroelectricity in atomically thin films by properly twisting 2 monolayers of centrosymmetric SrTiO_(3).Surprisingly,the emerged polarization vectors curl in the plane,forming a polar skyrmion lattice with each skyrmion as small as 1 nm,representing the highest polar skyrmion density to date.The emergent ferroelectricity originates from strong interlayer coupling effects and the resulting unique strain fields with obvious ion displacements,contributing to electric polarization comparable to that of PbTiO_(3).Moreover,we observe ultraflat bands(band width of less than 5 meV)at the valence band edge across a wide range of twist angles,which show widths that are smaller than those of common twisted bilayers of 2-dimensional materials.The present study not only overcomes the critical size limitation for ferroelectricity but also reveals a novel approach for achieving atomic-scale polar topologies,with important potential for applications in skyrmion-based ultrahigh-density memory technologies.
