Spontaneous liquid transport on an open surface offers a great opportunity to develop advanced systems with lower energy consumption and multifunction. Achieving universal liquid self-transport via a simplified carrier is highly desirable for fluid-controlling interfaces. Here, we present liquid self-transport beneath a flexible superhydrophilic track for versatile liquid manipulation. The capillary effect generated from the sandwiched channel drives directional liquid spreading with a speed ranging from 0.3 to 5 mm/s, which depends on the wettability and roughness of the paired substrates. Through the structural design and integration of channels, a series of applications such as pumpless microfluidic chips, interfacial evaporators, and portable electrolysis microchips have been demonstrated. We envision that this self-propelled liquid channel, with its extremely simple structure and high adaptability, will meet the requirements for efficient mass transfer and open new avenues for improving current systems in the fields of heat transfer, liquid harvester, microfluidics, etc.
{"title":"Universal liquid self-transport beneath a flexible superhydrophilic track","authors":"Moyuan Cao, Yuchen Qiu, Haoyu Bai, Xinsheng Wang, Zhe Li, Tianhong Zhao, Yaru Tian, Yuchen Wu, Lei Jiang","doi":"10.1016/j.matt.2024.04.037","DOIUrl":"https://doi.org/10.1016/j.matt.2024.04.037","url":null,"abstract":"<p>Spontaneous liquid transport on an open surface offers a great opportunity to develop advanced systems with lower energy consumption and multifunction. Achieving universal liquid self-transport via a simplified carrier is highly desirable for fluid-controlling interfaces. Here, we present liquid self-transport beneath a flexible superhydrophilic track for versatile liquid manipulation. The capillary effect generated from the sandwiched channel drives directional liquid spreading with a speed ranging from 0.3 to 5 mm/s, which depends on the wettability and roughness of the paired substrates. Through the structural design and integration of channels, a series of applications such as pumpless microfluidic chips, interfacial evaporators, and portable electrolysis microchips have been demonstrated. We envision that this self-propelled liquid channel, with its extremely simple structure and high adaptability, will meet the requirements for efficient mass transfer and open new avenues for improving current systems in the fields of heat transfer, liquid harvester, microfluidics, etc.</p>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":18.9,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140953441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-16DOI: 10.1016/j.matt.2024.04.039
Xiaocheng Zhou, Yaoda Wang, Yuming Gu, Jian Su, Yifan Liu, Ya Yin, Shuai Yuan, Jing Ma, Zhong Jin, Jing-Lin Zuo
Multifunctional metal-organic frameworks (MOFs) hold great potential in addressing challenges in energy storage devices by offering customizable guest-host interactions. Herein, we integrated Lewis acidic metal clusters (M = Zr4+, Hf4+, and Th4+) and redox-active Ni-bis(dithiolene) units (NiS4) into a series of bifunctional MOFs, which serve as both cathodic and anodic host materials for lithium-sulfur (Li-S) batteries. Through systematic control experiments and density functional theory simulations, we elucidate the crucial roles of metal clusters and NiS4 units in achieving efficient adsorption and rapid electrocatalytic conversion of polysulfides on the cathode and promoting uniform Li nucleation for enhanced cycling stability on the anode. Optimizing the MOF design resulted in advanced Li-S batteries, exhibiting remarkable capacity retention (81.5%) and an ultrahigh Coulombic efficiency (99.5%) after 800 cycles. This study highlights the potential of multifunctional MOFs in simultaneously overcoming the bottlenecks faced by the S cathode and Li anode.
多功能金属有机框架(MOFs)通过提供可定制的客体-宿主相互作用,在应对能量存储设备的挑战方面具有巨大潜力。在这里,我们将路易斯酸性金属簇(M = Zr4+、Hf4+ 和 Th4+)和具有氧化还原活性的镍-双(二硫代二苯)单元(NiS4)整合到一系列双功能 MOF 中,作为锂-硫(Li-S)电池的阴极和阳极宿主材料。通过系统控制实验和密度泛函理论模拟,我们阐明了金属团簇和 NiS4 单元在阴极实现多硫化物高效吸附和快速电催化转化以及在阳极促进锂均匀成核以增强循环稳定性方面的关键作用。通过优化 MOF 设计,先进的锂-S 电池在 800 次循环后表现出显著的容量保持率(81.5%)和超高的库仑效率(99.5%)。这项研究凸显了多功能 MOFs 在同时克服 S 阴极和 Li 阳极所面临的瓶颈方面的潜力。
{"title":"All-purpose redox-active metal-organic frameworks as both cathodic and anodic host materials for advanced lithium-sulfur batteries","authors":"Xiaocheng Zhou, Yaoda Wang, Yuming Gu, Jian Su, Yifan Liu, Ya Yin, Shuai Yuan, Jing Ma, Zhong Jin, Jing-Lin Zuo","doi":"10.1016/j.matt.2024.04.039","DOIUrl":"https://doi.org/10.1016/j.matt.2024.04.039","url":null,"abstract":"<p>Multifunctional metal-organic frameworks (MOFs) hold great potential in addressing challenges in energy storage devices by offering customizable guest-host interactions. Herein, we integrated Lewis acidic metal clusters (M = Zr<sup>4+</sup>, Hf<sup>4+</sup>, and Th<sup>4+</sup>) and redox-active Ni-bis(dithiolene) units (NiS<sub>4</sub>) into a series of bifunctional MOFs, which serve as both cathodic and anodic host materials for lithium-sulfur (Li-S) batteries. Through systematic control experiments and density functional theory simulations, we elucidate the crucial roles of metal clusters and NiS<sub>4</sub> units in achieving efficient adsorption and rapid electrocatalytic conversion of polysulfides on the cathode and promoting uniform Li nucleation for enhanced cycling stability on the anode. Optimizing the MOF design resulted in advanced Li-S batteries, exhibiting remarkable capacity retention (81.5%) and an ultrahigh Coulombic efficiency (99.5%) after 800 cycles. This study highlights the potential of multifunctional MOFs in simultaneously overcoming the bottlenecks faced by the S cathode and Li anode.</p>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":18.9,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140953618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.1016/j.matt.2024.04.033
Zhi Zeng, Le Yu, Shanchen Yang, Kunkun Guo, Chao Xu, Chaoji Chen, Zhaohui Wang
Innovative biopolymers emulating natural organisms’ reversible water-induced deformations hold great potential across various domains. Here, we create a biopolymer that unifies actuation, hydrosetting, and shape-memory capabilities through copper-coordinated mercerization of nanocellulose paper. This method transforms the inherently hydrophilic, porous nanocellulose network into a compact amphiphilic membrane, distinguished by Cu2+-crosslinked hydrophobic domains acting as tough “net points,” ensuring exceptional water stability and ultrahigh wet mechanical performance (94.9 MPa and 3.50 GPa). Upon hydration, the membrane swiftly establishes reversible hydrogen-bonding “switches,” enabling a rapid plastic-elastic transition. The interplay between the net points and switches resolves the inherent trade-off between rapid, reversible hydrogen-bonding networks and mechanical robustness in cellulosic materials, thereby facilitating remarkable water-induced actuation, hydrosetting, and shape memory. Notably, the membrane demonstrates complex morphing and swift recovery in water, serving as a smart encrypted information carrier. Our study offers a molecular structural engineering paradigm for the rational design of advanced responsive materials.
{"title":"Tuning water-cellulose interactions via copper-coordinated mercerization for hydro-actuated, shape-memory cellulosic hydroplastics","authors":"Zhi Zeng, Le Yu, Shanchen Yang, Kunkun Guo, Chao Xu, Chaoji Chen, Zhaohui Wang","doi":"10.1016/j.matt.2024.04.033","DOIUrl":"https://doi.org/10.1016/j.matt.2024.04.033","url":null,"abstract":"<p>Innovative biopolymers emulating natural organisms’ reversible water-induced deformations hold great potential across various domains. Here, we create a biopolymer that unifies actuation, hydrosetting, and shape-memory capabilities through copper-coordinated mercerization of nanocellulose paper. This method transforms the inherently hydrophilic, porous nanocellulose network into a compact amphiphilic membrane, distinguished by Cu<sup>2+</sup>-crosslinked hydrophobic domains acting as tough “net points,” ensuring exceptional water stability and ultrahigh wet mechanical performance (94.9 MPa and 3.50 GPa). Upon hydration, the membrane swiftly establishes reversible hydrogen-bonding “switches,” enabling a rapid plastic-elastic transition. The interplay between the net points and switches resolves the inherent trade-off between rapid, reversible hydrogen-bonding networks and mechanical robustness in cellulosic materials, thereby facilitating remarkable water-induced actuation, hydrosetting, and shape memory. Notably, the membrane demonstrates complex morphing and swift recovery in water, serving as a smart encrypted information carrier. Our study offers a molecular structural engineering paradigm for the rational design of advanced responsive materials.</p>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":18.9,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140949651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-15DOI: 10.1016/j.matt.2024.04.031
Weicheng Huang, Tian Yu, K. Jimmy Hsia, Sigrid Adriaenssens, Mingchao Liu
Foldable structures find diverse applications. Folding of thin structures into compact shapes involves the interplay of nonlinear mechanics and topology. In this study, we employ discrete models, theoretical analysis, and tabletop experiments to systematically investigate the geometrically nonlinear folding process of ring-shape elastic ribbons through in-plane kinks and out-of-plane creases. We find that kinks initiate continuous folding through supercritical bifurcation, while creases trigger abrupt snapping via subcritical bifurcation. Master curves that summarize energy landscapes for ribbons with varying numbers of kinks and creases are obtained. By integrating kinks and creases, a “meta-ribbon” can be created, which shows the tunable folding behavior, transitioning from continuous to snapping, or vice versa, by strategically engineering the in-plane and out-of-plane angles guided by the constructed energy map. As a product of folding, we demonstrate the snapping-induced vibration accomplished with dynamic folding, as well as the multistability of meta-ribbons with saddle-like configurations and their transformation.
{"title":"Integration of kinks and creases enables tunable folding in meta-ribbons","authors":"Weicheng Huang, Tian Yu, K. Jimmy Hsia, Sigrid Adriaenssens, Mingchao Liu","doi":"10.1016/j.matt.2024.04.031","DOIUrl":"https://doi.org/10.1016/j.matt.2024.04.031","url":null,"abstract":"<p>Foldable structures find diverse applications. Folding of thin structures into compact shapes involves the interplay of nonlinear mechanics and topology. In this study, we employ discrete models, theoretical analysis, and tabletop experiments to systematically investigate the geometrically nonlinear folding process of ring-shape elastic ribbons through in-plane kinks and out-of-plane creases. We find that kinks initiate continuous folding through supercritical bifurcation, while creases trigger abrupt snapping via subcritical bifurcation. Master curves that summarize energy landscapes for ribbons with varying numbers of kinks and creases are obtained. By integrating kinks and creases, a “meta-ribbon” can be created, which shows the tunable folding behavior, transitioning from continuous to snapping, or vice versa, by strategically engineering the in-plane and out-of-plane angles guided by the constructed energy map. As a product of folding, we demonstrate the snapping-induced vibration accomplished with dynamic folding, as well as the multistability of meta-ribbons with saddle-like configurations and their transformation.</p>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":18.9,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140949569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-14DOI: 10.1016/j.matt.2024.04.022
Malcolm Sim, Mohammad Ghazi Vakili, Felix Strieth-Kalthoff, Han Hao, Riley J. Hickman, Santiago Miret, Sergio Pablo-García, Alán Aspuru-Guzik
Self-driving laboratories (SDLs), which combine automated experimental hardware with computational experiment planning, have emerged as powerful tools for accelerating materials discovery. The intrinsic complexity created by their multitude of components requires an effective orchestration platform to ensure the correct operation of diverse experimental setups. Existing orchestration frameworks, however, are either tailored to specific setups or have not been implemented for real-world synthesis. To address these issues, we introduce ChemOS 2.0, an orchestration architecture that efficiently coordinates communication, data exchange, and instruction management among modular laboratory components. By treating the laboratory as an “operating system,” ChemOS 2.0 combines ab initio calculations, experimental orchestration, and statistical algorithms to guide closed-loop operations. To demonstrate its capabilities, we showcase ChemOS 2.0 in a case study focused on discovering organic laser molecules. The results confirm ChemOS 2.0’s prowess in accelerating materials research and demonstrate its potential as a valuable design for future SDL platforms.
{"title":"ChemOS 2.0: An orchestration architecture for chemical self-driving laboratories","authors":"Malcolm Sim, Mohammad Ghazi Vakili, Felix Strieth-Kalthoff, Han Hao, Riley J. Hickman, Santiago Miret, Sergio Pablo-García, Alán Aspuru-Guzik","doi":"10.1016/j.matt.2024.04.022","DOIUrl":"https://doi.org/10.1016/j.matt.2024.04.022","url":null,"abstract":"<p>Self-driving laboratories (SDLs), which combine automated experimental hardware with computational experiment planning, have emerged as powerful tools for accelerating materials discovery. The intrinsic complexity created by their multitude of components requires an effective orchestration platform to ensure the correct operation of diverse experimental setups. Existing orchestration frameworks, however, are either tailored to specific setups or have not been implemented for real-world synthesis. To address these issues, we introduce ChemOS 2.0, an orchestration architecture that efficiently coordinates communication, data exchange, and instruction management among modular laboratory components. By treating the laboratory as an “operating system,” ChemOS 2.0 combines <em>ab initio</em> calculations, experimental orchestration, and statistical algorithms to guide closed-loop operations. To demonstrate its capabilities, we showcase ChemOS 2.0 in a case study focused on discovering organic laser molecules. The results confirm ChemOS 2.0’s prowess in accelerating materials research and demonstrate its potential as a valuable design for future SDL platforms.</p>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":18.9,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140919980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-10DOI: 10.1016/j.matt.2024.04.023
Mohammad Madani, Anna Tarakanova
The classical central paradigm of structural biology links a protein’s sequence to its structure and function but overlooks conformational fluctuation that is integral to protein function. We propose a graph neural network model based on gated attention that explicitly incorporates protein dynamics via physics-based models to predict protein crystallization propensity. We compare results to all-atom molecular dynamics simulations of flexible, disordered human tropoelastin and ordered, globular human lysyl oxidase-like protein. Our findings show that fluctuating residues correlate with locally maximal attention scores in the neural network. By methodically truncating the sequences, we establish correlations between dynamical and physicochemical molecular properties and protein crystallization propensity. Accounting for comprehensive biological mechanisms, our tool can facilitate the rational design of protein sequences that lead to diffraction-quality crystals. Our study showcases the integration of physics-based and machine learning models for structure and property prediction, expanding the classical paradigm of structural biology.
{"title":"Protein dynamics inform protein structure: An interdisciplinary investigation of protein crystallization propensity","authors":"Mohammad Madani, Anna Tarakanova","doi":"10.1016/j.matt.2024.04.023","DOIUrl":"https://doi.org/10.1016/j.matt.2024.04.023","url":null,"abstract":"<p>The classical central paradigm of structural biology links a protein’s sequence to its structure and function but overlooks conformational fluctuation that is integral to protein function. We propose a graph neural network model based on gated attention that explicitly incorporates protein dynamics via physics-based models to predict protein crystallization propensity. We compare results to all-atom molecular dynamics simulations of flexible, disordered human tropoelastin and ordered, globular human lysyl oxidase-like protein. Our findings show that fluctuating residues correlate with locally maximal attention scores in the neural network. By methodically truncating the sequences, we establish correlations between dynamical and physicochemical molecular properties and protein crystallization propensity. Accounting for comprehensive biological mechanisms, our tool can facilitate the rational design of protein sequences that lead to diffraction-quality crystals. Our study showcases the integration of physics-based and machine learning models for structure and property prediction, expanding the classical paradigm of structural biology.</p>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":18.9,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140903391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-09DOI: 10.1016/j.matt.2024.04.024
Lima Zhou, Lukas Puntigam, Peter Lunkenheimer, Edith Bourret, Zewu Yan, István Kézsmárki, Dennis Meier, Stephan Krohns, Jan Schultheiß, Donald M. Evans
A promising mechanism for achieving colossal dielectric constants involves the use of insulating internal barrier layers, such as insulating domain walls in ferroelectrics. A key advantage of domain walls, compared to other stationary interfaces, is their mobility, offering the potential for post-synthesis adjustment of the dielectric constant. In this work, we demonstrate that altering the domain wall density enables the tuning of the dielectric constant in our template material, i.e., hexagonal ErMnO3 single crystals. Through microscopy and macroscopic dielectric spectroscopy, we quantify changes in domain wall density and correlated these with changes in dielectric constant within a single sample. Analysis of the dielectric data suggests that the insulating domain walls act as “ideal” capacitors connected in series. Our approach to engineering the domain wall density can be readily extended to other control methods, e.g., electric fields or mechanical stresses, providing a degree of flexibility to in situ tune the dielectric constant.
{"title":"Post-synthesis tuning of dielectric constant via ferroelectric domain wall engineering","authors":"Lima Zhou, Lukas Puntigam, Peter Lunkenheimer, Edith Bourret, Zewu Yan, István Kézsmárki, Dennis Meier, Stephan Krohns, Jan Schultheiß, Donald M. Evans","doi":"10.1016/j.matt.2024.04.024","DOIUrl":"https://doi.org/10.1016/j.matt.2024.04.024","url":null,"abstract":"<p>A promising mechanism for achieving colossal dielectric constants involves the use of insulating internal barrier layers, such as insulating domain walls in ferroelectrics. A key advantage of domain walls, compared to other stationary interfaces, is their mobility, offering the potential for post-synthesis adjustment of the dielectric constant. In this work, we demonstrate that altering the domain wall density enables the tuning of the dielectric constant in our template material, i.e., hexagonal ErMnO<sub>3</sub> single crystals. Through microscopy and macroscopic dielectric spectroscopy, we quantify changes in domain wall density and correlated these with changes in dielectric constant within a single sample. Analysis of the dielectric data suggests that the insulating domain walls act as “ideal” capacitors connected in series. Our approach to engineering the domain wall density can be readily extended to other control methods, e.g., electric fields or mechanical stresses, providing a degree of flexibility to <em>in situ</em> tune the dielectric constant.</p>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":18.9,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140903031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-01DOI: 10.1016/j.matt.2024.04.005
Steve Cranford
{"title":"Want for nothing, need for null, useful output from negative results","authors":"Steve Cranford","doi":"10.1016/j.matt.2024.04.005","DOIUrl":"https://doi.org/10.1016/j.matt.2024.04.005","url":null,"abstract":"","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":18.9,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140816542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-01DOI: 10.1016/j.matt.2024.03.005
Jee Yung Park , Yoon Ho Lee , Md Asaduz Zaman Mamun , Mir Md Fahimul Islam , Shuchen Zhang , Ke Ma , Aalok Uday Gaitonde , Kang Wang , Seok Joo Yang , Amy Marconnet , Jianguo Mei , Muhammad Ashraful Alam , Letian Dou
Understanding ion migration in two-dimensional (2D) perovskite materials is key to enhancing halide perovskite device performance and stability. However, prior studies have been primarily limited to heat- and light-induced ion migration. In this work, to investigate electrically induced ion migration in 2D perovskites, we construct a high-quality, single-crystal, 2D perovskite heterostructure device platform with near-defect-free van der Waals contact. While achieving real-time visualization of halide anions migrating toward the positive bias, defined here as directional ion migration, we also uncover the unique behavior of halide anions interdiffusing toward the opposite direction under prolonged bias. Confocal microscopy imaging reveals a halide migration channel that aligns with the crystal and heterojunction edges. After a sustained ion migration, stable junction diodes exhibiting an up to ∼1,000-fold forward-to-reverse current ratio are realized. This study unveils important fundamental insights into halide migration under electrical bias, paving the way toward high-performance devices.
{"title":"Electrically induced directional ion migration in two-dimensional perovskite heterostructures","authors":"Jee Yung Park , Yoon Ho Lee , Md Asaduz Zaman Mamun , Mir Md Fahimul Islam , Shuchen Zhang , Ke Ma , Aalok Uday Gaitonde , Kang Wang , Seok Joo Yang , Amy Marconnet , Jianguo Mei , Muhammad Ashraful Alam , Letian Dou","doi":"10.1016/j.matt.2024.03.005","DOIUrl":"10.1016/j.matt.2024.03.005","url":null,"abstract":"<div><p>Understanding ion migration in two-dimensional (2D) perovskite materials is key to enhancing halide perovskite device performance and stability. However, prior studies have been primarily limited to heat- and light-induced ion migration. In this work, to investigate electrically induced ion migration in 2D perovskites, we construct a high-quality, single-crystal, 2D perovskite heterostructure device platform with near-defect-free van der Waals contact. While achieving real-time visualization of halide anions migrating toward the positive bias, defined here as directional ion migration, we also uncover the unique behavior of halide anions interdiffusing toward the opposite direction under prolonged bias. Confocal microscopy imaging reveals a halide migration channel that aligns with the crystal and heterojunction edges. After a sustained ion migration, stable junction diodes exhibiting an up to ∼1,000-fold forward-to-reverse current ratio are realized. This study unveils important fundamental insights into halide migration under electrical bias, paving the way toward high-performance devices.</p></div>","PeriodicalId":388,"journal":{"name":"Matter","volume":null,"pages":null},"PeriodicalIF":18.9,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140565758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}