Perovskite optoelectronic devices,capitalizing on the exceptional light-matter interaction and semiconductor properties of perovskite materials,have emerged as transformative platforms for energy conversion,informatio...Perovskite optoelectronic devices,capitalizing on the exceptional light-matter interaction and semiconductor properties of perovskite materials,have emerged as transformative platforms for energy conversion,information storage,and photonic technologies.While material innovations and device engineering breakthroughs have propelled remarkable advancements,persistent challenges in operational stability,scalable manufacturing,and batch reproducibility continue to hinder commercial implementation.Recently,molecular ferroelectrics(MOFEs),as a class of materials characterized by polar crystal structures and switchable spontaneous polarization(P_(s)),offer novel pathways to regulate high-efficiency and stable perovskite optoelectronic devices.Here,we systematically review the application of MOFEs into diverse perovskite optoelectronic systems,emphasizing the synergistic effect between P_(s)and optoelectronic properties.We analyze MOFEs-based photodetectors spanning self-powered,X-ray,and polarized-light detectors,detailing how P_(s)and synergistic physical effects optimize device performance.For photovoltaic applications,we elucidate polarizationdriven performance enhancement mechanisms in perovskite solar cells(PSCs),including built-in field amplification,defect passivation,and stability improvement.Furthermore,we envisage the emerging applications of MOFEs in optoelectronic fields such as non-volatile memory,neuromorphic computing,and optical communication.Overall,this review furnishes valuable insights into optoelectronics and future energy.展开更多
Ferroelectric materials find extensive applications in brake systems due to their capability to convert electrical energy into mechanical energy.Recent research has focused on lead-free materials for their environment...Ferroelectric materials find extensive applications in brake systems due to their capability to convert electrical energy into mechanical energy.Recent research has focused on lead-free materials for their environmentally friendly characteristics.However,they exhibit several challenges such as significant negative strain,limited strain values,and large driving field.In this work,novel preparation techniques(electrospinning)were utilized for BaTiO_(3)to introduce oxygen vacancies and barium defects,facilitating the creation of oriented defect dipoles coupled with an intrinsic electric field(Ei)after poling and aging.Due to the existence of Ei,two minimum points in the strain hysteresis loop were shifted to the same quadrant in the Strain-Electric field space.Thus,when applying an electric field along the Ei direction,negative strain is eliminated.Additionally,the actual electric field is the sum of the applied electric field and Ei,thereby reducing the required driving field of the piezoelectric.The stretching of defect dipoles under the electric field further amplified the total strain.Through the proposed mechanisms,this work achieved a substantial unipolar electrostrain of 1.04%under a relatively low electric field(30 kV/cm)in BaTiO_(3).This work successfully addressed the challenges of high-driving electric fields,limited strain values,and negative strain,providing a comprehensive approach for improving field-induced strain performance through point defect engineering in ferroelectric materials.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52302229)the State Key Laboratory of Photovoltaic Science and Technology of China(No.202401030301)the Key Lab of Modern Optical Technologies of Education Ministry of China,Soochow University(No.KJS2425)。
文摘Perovskite optoelectronic devices,capitalizing on the exceptional light-matter interaction and semiconductor properties of perovskite materials,have emerged as transformative platforms for energy conversion,information storage,and photonic technologies.While material innovations and device engineering breakthroughs have propelled remarkable advancements,persistent challenges in operational stability,scalable manufacturing,and batch reproducibility continue to hinder commercial implementation.Recently,molecular ferroelectrics(MOFEs),as a class of materials characterized by polar crystal structures and switchable spontaneous polarization(P_(s)),offer novel pathways to regulate high-efficiency and stable perovskite optoelectronic devices.Here,we systematically review the application of MOFEs into diverse perovskite optoelectronic systems,emphasizing the synergistic effect between P_(s)and optoelectronic properties.We analyze MOFEs-based photodetectors spanning self-powered,X-ray,and polarized-light detectors,detailing how P_(s)and synergistic physical effects optimize device performance.For photovoltaic applications,we elucidate polarizationdriven performance enhancement mechanisms in perovskite solar cells(PSCs),including built-in field amplification,defect passivation,and stability improvement.Furthermore,we envisage the emerging applications of MOFEs in optoelectronic fields such as non-volatile memory,neuromorphic computing,and optical communication.Overall,this review furnishes valuable insights into optoelectronics and future energy.
基金supported by the National Nature Science Foundation(Nos.52372125 and 52333009)the National Key Research and Development Project(Nos.2020YFC1521900 and 2020YFC1521904)+4 种基金the Shaanxi Provincial Science Foundation(No.2021GXLH-01-11)the Yulin Project(No.2022-19-11)the Fundamental Research Funds for the Central Universities(No.D5000230071)the 111 Program(No.B08040)of MOE of Chinasponsored by Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(No.CX2024063).
文摘Ferroelectric materials find extensive applications in brake systems due to their capability to convert electrical energy into mechanical energy.Recent research has focused on lead-free materials for their environmentally friendly characteristics.However,they exhibit several challenges such as significant negative strain,limited strain values,and large driving field.In this work,novel preparation techniques(electrospinning)were utilized for BaTiO_(3)to introduce oxygen vacancies and barium defects,facilitating the creation of oriented defect dipoles coupled with an intrinsic electric field(Ei)after poling and aging.Due to the existence of Ei,two minimum points in the strain hysteresis loop were shifted to the same quadrant in the Strain-Electric field space.Thus,when applying an electric field along the Ei direction,negative strain is eliminated.Additionally,the actual electric field is the sum of the applied electric field and Ei,thereby reducing the required driving field of the piezoelectric.The stretching of defect dipoles under the electric field further amplified the total strain.Through the proposed mechanisms,this work achieved a substantial unipolar electrostrain of 1.04%under a relatively low electric field(30 kV/cm)in BaTiO_(3).This work successfully addressed the challenges of high-driving electric fields,limited strain values,and negative strain,providing a comprehensive approach for improving field-induced strain performance through point defect engineering in ferroelectric materials.
