Thanks to the excellent optoelectronic properties,lead halide perovskites(LHPs)have been widely employed in highperformance optoelectronic devices such as solar cells and lightemitting diodes.However,overcoming their ...Thanks to the excellent optoelectronic properties,lead halide perovskites(LHPs)have been widely employed in highperformance optoelectronic devices such as solar cells and lightemitting diodes.However,overcoming their poor stability against water has been one of the biggest challenges for most applications.Herein,we report a novel hot-injection method in a Pb-poor environment combined with a well-designed purification process to synthesize water-dispersible CsPbBr_(3) nanocrystals(NCs).The as-prepared NCs sustain their superior photoluminescence(91%quantum yield in water)for more than 200 days in an aqueous environment,which is attributed to a passivation effect induced by excess CsBr salts.Thanks to the ultra-stability of these LHP NCs,for the first time,we report a new application of LHP NCs,in which they are applied to electrocatalysis of CO_(2) reduction reaction.Noticeably,they show significant electrocatalytic activity(faradaic yield:32%for CH4,40%for CO)and operation stability(>350 h).展开更多
Altermagnets,with spin splitting and vanishing magnetization,have been attributed to many fascinating phenomena and potential applications.In particular,integrating ferroelectricity with altermagnetism to enable magne...Altermagnets,with spin splitting and vanishing magnetization,have been attributed to many fascinating phenomena and potential applications.In particular,integrating ferroelectricity with altermagnetism to enable magnetoelectric coupling and electric control of spin has drawn significant attention.However,its experimental realization and precise spin manipulation remain elusive.Here,by focusing on molecular ferroelectrics,the first discovered ferroelectrics renowned for their highly controllable molecular polarizations and structural flexibility,we reveal that these obstacles can be removed by an emergent multiferroic altermagnet with tunable spin polarization in a large class of fabricated organic materials.Using a symmetry-based design and a tight-binding model,we uncover the underlying mechanism of such molecular ferroelectric altermagnets and demonstrate how noncollinear molecular polarization can switch the spin polarization on and off and even reverse its sign,as detectable by the magneto-optical Kerr effect.From the first-principles calculations,we verify the feasibility of these materials in a series of well-established hybrid organic-inorganic perovskites and metal-organic frameworks.Our findings bridge molecular ferroelectrics and altermagnetic spintronics,highlighting an unexplored potential of multifunctional organic multiferroics.展开更多
While logic devices in conventional electronics rely on the control of the charged carriers in the semiconductor chips, robust information storage in computer hard drives and magnetic random access memory is implement...While logic devices in conventional electronics rely on the control of the charged carriers in the semiconductor chips, robust information storage in computer hard drives and magnetic random access memory is implemented using the carriers＇ spin in ferromagnetic metals. A long quest to realize magnetic semiconductors [1-3] can be simply summarized as： 1＋1〉2, in hope that combining the control of charge and spin in a single material would become more than just the sum of its separate parts （charge and spin） and enable new or improved functionalities [3].展开更多
基金This research was supported by the National Natural Science Foundation of China(Nos.11674258,51602305,51702219,61975134,11904250)Guangdong Basic and Applied Basic Research Foundation(2020B1515020051)+2 种基金the Science and Technology Innovation Commission of Shenzhen(JCYJ20180305125345378)Shenzhen Nanshan District Pilotage Team Program(LHTD20170006)Partial support from The Institute For Lasers,Photonics and Biophotonics at The University at Buffalo is also acknowledged.T.Z.and I.Z.were supported by the U.S.DOE,Office of Science BES,Award No.DE-SC0004890.
文摘Thanks to the excellent optoelectronic properties,lead halide perovskites(LHPs)have been widely employed in highperformance optoelectronic devices such as solar cells and lightemitting diodes.However,overcoming their poor stability against water has been one of the biggest challenges for most applications.Herein,we report a novel hot-injection method in a Pb-poor environment combined with a well-designed purification process to synthesize water-dispersible CsPbBr_(3) nanocrystals(NCs).The as-prepared NCs sustain their superior photoluminescence(91%quantum yield in water)for more than 200 days in an aqueous environment,which is attributed to a passivation effect induced by excess CsBr salts.Thanks to the ultra-stability of these LHP NCs,for the first time,we report a new application of LHP NCs,in which they are applied to electrocatalysis of CO_(2) reduction reaction.Noticeably,they show significant electrocatalytic activity(faradaic yield:32%for CH4,40%for CO)and operation stability(>350 h).
基金supported by the National Natural Science Foundation of China(12474155,12447163,and 11904250)the Zhejiang Provincial Natural Science Foundation of China(LR25A040001)+1 种基金the China Postdoctoral Science Foundation(2025M773440)the U.S.DOE,Office of Science BES,Award No.DE-SC0004890(Y.L,I.Z.).
文摘Altermagnets,with spin splitting and vanishing magnetization,have been attributed to many fascinating phenomena and potential applications.In particular,integrating ferroelectricity with altermagnetism to enable magnetoelectric coupling and electric control of spin has drawn significant attention.However,its experimental realization and precise spin manipulation remain elusive.Here,by focusing on molecular ferroelectrics,the first discovered ferroelectrics renowned for their highly controllable molecular polarizations and structural flexibility,we reveal that these obstacles can be removed by an emergent multiferroic altermagnet with tunable spin polarization in a large class of fabricated organic materials.Using a symmetry-based design and a tight-binding model,we uncover the underlying mechanism of such molecular ferroelectric altermagnets and demonstrate how noncollinear molecular polarization can switch the spin polarization on and off and even reverse its sign,as detectable by the magneto-optical Kerr effect.From the first-principles calculations,we verify the feasibility of these materials in a series of well-established hybrid organic-inorganic perovskites and metal-organic frameworks.Our findings bridge molecular ferroelectrics and altermagnetic spintronics,highlighting an unexplored potential of multifunctional organic multiferroics.
基金supported by the U.S.Department of Energy,Office of Basic Energy Sciences(Grant No.DE-SC004890)
文摘While logic devices in conventional electronics rely on the control of the charged carriers in the semiconductor chips, robust information storage in computer hard drives and magnetic random access memory is implemented using the carriers＇ spin in ferromagnetic metals. A long quest to realize magnetic semiconductors [1-3] can be simply summarized as： 1＋1〉2, in hope that combining the control of charge and spin in a single material would become more than just the sum of its separate parts （charge and spin） and enable new or improved functionalities [3].
