The hybrid organic–inorganic perovskites(HOIPs)have attracted much attention for their potential applications as novel optoelectronic devices.Remarkably,the Rashba band splitting,together with specific spin orientati...The hybrid organic–inorganic perovskites(HOIPs)have attracted much attention for their potential applications as novel optoelectronic devices.Remarkably,the Rashba band splitting,together with specific spin orientations in k-space(i.e.,spin texture),has been found to be relevant for the optoelectronic performances.In this work,by using first-principles calculations and symmetry analysis,we study the electric polarization,magnetism.展开更多
Hybrid organic–inorganic perovskites(HOIPs)are introducing exotic directions in the photovoltaic materials landscape.The coexistence of inversion symmetry breaking and spin–orbit interactions play a key role in thei...Hybrid organic–inorganic perovskites(HOIPs)are introducing exotic directions in the photovoltaic materials landscape.The coexistence of inversion symmetry breaking and spin–orbit interactions play a key role in their optoelectronic properties.We perform a detailed study on a recently synthesized ferroelectric layered HOIP,(AMP)PbI_(4)(AMP=4-aminomethyl-piperidinium).The calculated polarization and Rashba parameters are in excellent agreement with experimental values.展开更多
In this work,we study the structural changes of the polar[NH4][Cd(HCOO)3]hybrid perovskite under external hydrostatic pressure.We report a reversible framework rearrangement as a function of pressure characterized by:...In this work,we study the structural changes of the polar[NH4][Cd(HCOO)3]hybrid perovskite under external hydrostatic pressure.We report a reversible framework rearrangement as a function of pressure characterized by:(i)a gradual modification of one formate ligand,which changes its coordination mode from a bridging syn–anti mode at atmospheric pressure(LP-phase)to a chelating-anti mode at high-pressure(HP-phase)and(ii)a change in the coordination of the Cd2+cations from six-coordinated(LP-phase)to hepta-coordinated(HP-phase).Very interestingly,this unprecedented framework arrangement displays a large electrical polarization.For instance,the polarization value observed at p=17.7 GPa is about four times the polarization at atmospheric pressure.Therefore,we report that the external pressure induces a novel framework rearrangement in the polar[NH4][Cd(HCOO)3]hybrid perovskite with enhanced electrical polarization.This structure–property relationship offers new insights for designing novel ferroelectric materials based on pressure-responsive hybrid perovskite materials.展开更多
Ferroelectrics with luminescent properties are promising candidates for the next generation of optical waveguides and displays.However,reports on ferroelectrics with triboluminescence properties have been very scarce ...Ferroelectrics with luminescent properties are promising candidates for the next generation of optical waveguides and displays.However,reports on ferroelectrics with triboluminescence properties have been very scarce so far.In this study,we demonstrate a potential hybrid molecular ferroelectric,(Ph_(3)PO)_(2)MnBr_(2),which exhibits intense green triboluminescence.Using piezoresponse force microscopy,the presence of ferroelectric domains in(Ph_(3)PO)_(2)MnBr_(2)thin films is confirmed.We also show evidence for the reversible switching of the ferroelectric domains by poling with DC biases.We believe that this combination of ferroelectricity and triboluminescence will bring about potential multifunctional optoelectronic device applications.展开更多
基金This work is supported by NSFC 11825403,the Program for Professor of Special Appointment(Eastern Scholar),the Qing Nian Ba Jian Program,and the Fok Ying Tung Education Foundation。
文摘The hybrid organic–inorganic perovskites(HOIPs)have attracted much attention for their potential applications as novel optoelectronic devices.Remarkably,the Rashba band splitting,together with specific spin orientations in k-space(i.e.,spin texture),has been found to be relevant for the optoelectronic performances.In this work,by using first-principles calculations and symmetry analysis,we study the electric polarization,magnetism.
基金This project has received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement No.713679 and from the Universitat Rovira i Virgili(URV)J.M.P.and C.d.G thank the Spanish Ministry of Science(grants CTQ2017-87269-P and CTQ2017-83566-P)+3 种基金the Generalitat de Catalunya(grant 2017SGR629)for supportJ.M.P.also thanks ICREA foundation for an ICREA ACADEMIA awardH.G.acknowledges support from the National Postdoctoral Program for Innovative Talents(No.BX20190361)Guangdong Basic and Applied Basic Research Foundation(No.2019A1515110965).
文摘Hybrid organic–inorganic perovskites(HOIPs)are introducing exotic directions in the photovoltaic materials landscape.The coexistence of inversion symmetry breaking and spin–orbit interactions play a key role in their optoelectronic properties.We perform a detailed study on a recently synthesized ferroelectric layered HOIP,(AMP)PbI_(4)(AMP=4-aminomethyl-piperidinium).The calculated polarization and Rashba parameters are in excellent agreement with experimental values.
基金supported by the Ministerio de Economía y Competitividad(MINECO)and EU-FEDER under the projects[CSD2007-00045,CTQ2015-67755-C2-1-R and MAT2017-86453-R]Ministerio de Ciencia,Innovación y Universidades(MICINN)and EU-FEDER under the project PGC2018-094814-B-C21Xunta de Galicia under the project ED431C2018/39.
文摘In this work,we study the structural changes of the polar[NH4][Cd(HCOO)3]hybrid perovskite under external hydrostatic pressure.We report a reversible framework rearrangement as a function of pressure characterized by:(i)a gradual modification of one formate ligand,which changes its coordination mode from a bridging syn–anti mode at atmospheric pressure(LP-phase)to a chelating-anti mode at high-pressure(HP-phase)and(ii)a change in the coordination of the Cd2+cations from six-coordinated(LP-phase)to hepta-coordinated(HP-phase).Very interestingly,this unprecedented framework arrangement displays a large electrical polarization.For instance,the polarization value observed at p=17.7 GPa is about four times the polarization at atmospheric pressure.Therefore,we report that the external pressure induces a novel framework rearrangement in the polar[NH4][Cd(HCOO)3]hybrid perovskite with enhanced electrical polarization.This structure–property relationship offers new insights for designing novel ferroelectric materials based on pressure-responsive hybrid perovskite materials.
基金supported by the National Natural Science Foundations of China(Grant No.21541013)Natural Science Foundations of Jiangsu(Grant No.BK20150596 and BK20160029).
文摘Ferroelectrics with luminescent properties are promising candidates for the next generation of optical waveguides and displays.However,reports on ferroelectrics with triboluminescence properties have been very scarce so far.In this study,we demonstrate a potential hybrid molecular ferroelectric,(Ph_(3)PO)_(2)MnBr_(2),which exhibits intense green triboluminescence.Using piezoresponse force microscopy,the presence of ferroelectric domains in(Ph_(3)PO)_(2)MnBr_(2)thin films is confirmed.We also show evidence for the reversible switching of the ferroelectric domains by poling with DC biases.We believe that this combination of ferroelectricity and triboluminescence will bring about potential multifunctional optoelectronic device applications.
