In the process of spraying coating perovskite films,the"coffee ring"effect(CRE)leads to the problem of excessive organic ammonium salt accumulation in local areas that cannot be completely eliminated.We intr...In the process of spraying coating perovskite films,the"coffee ring"effect(CRE)leads to the problem of excessive organic ammonium salt accumulation in local areas that cannot be completely eliminated.We introduce an in-situ targeted defect-healing strategy by incorporating butylamine formate(BAFa)ionic liquid into the spray ink.Ionic liquids,due to their long carbon chain structure,tend to target flow towards the CRE region during the droplet evaporation process.The coordination between the lone pair electrons in the C=O group of BAFa and Pb^(2+)effectively reduces defects in perovskite and suppresses non-radiative recombination losses.Simultaneously,amine ligands,which are repelled to the film surface and grain boundaries,form a thin insulating monolayer in the CRE areas,forcing charge carriers to transport through areas of the perovskite with fewer defects.This approach enables the crystallization control and defect-heal over the Cs_(0.19)FA_(0.81)PbI_(3-x-y)Br_(x)Cl_(y)perovskite films.Consequently,the champion perovskite solar cell achieved a power conversion efficiency of 22.04%,while mini-modules with an effective area of 64.8 cm^(2)reached a peak power conversion efficiency of 18.35%,demonstrating the significant potential for commercializing large-area perovskite solar cells.展开更多
Carbon fiber is a kind of high-temperature fiber with high modulus and strength characteristics.Carbon fiber material is made of carbon fiber braid with carbon content>90%.Among them,resin-based carbon fiber reinfo...Carbon fiber is a kind of high-temperature fiber with high modulus and strength characteristics.Carbon fiber material is made of carbon fiber braid with carbon content>90%.Among them,resin-based carbon fiber reinforced composite material is often used as automotive structural material.Compared with the A36 steel commonly used in automobiles,the T300/5208 carbon fiber reinforced epoxy resin composite commonly used in automobiles has a higher tensile strength of 2500-3300 MPa and a lower density of 6.25 g/cm 3,showing great performance advantages.In this paper,by analyzing the trend of automobile lightweight,and exploring the development prospects of carbon fiber in the field of automobile lightweight,the literature in the Elsevier database is analyzed by scientific measurement analysis method,and the research hotspot in the field is listed.The relationship between the development of fiber materials and the promotion of policies is analyzed by comparing the number of carbon fiber automobile literature publications and key event nodes.This paper proposes a keyword-based influence calculation method.Through drawing analysis tools of information visualization scientific knowledge map and scientific measurement methods of keyword,it proposes the scientific measurement analysis literature of on-board carbon fiber,explores and discusses some frontier directions of automotive carbon fiber materials.The research provides reference for studying automobile lightweight carbon fiber material.展开更多
基金supported by the National Natural Science Foundation of China(U21A20171,U20A20245)Natural Scienceof Hubei Province(2023AFA010)Independent Innovation Projects of the Hubei Longzhong Laboratory。
文摘In the process of spraying coating perovskite films,the"coffee ring"effect(CRE)leads to the problem of excessive organic ammonium salt accumulation in local areas that cannot be completely eliminated.We introduce an in-situ targeted defect-healing strategy by incorporating butylamine formate(BAFa)ionic liquid into the spray ink.Ionic liquids,due to their long carbon chain structure,tend to target flow towards the CRE region during the droplet evaporation process.The coordination between the lone pair electrons in the C=O group of BAFa and Pb^(2+)effectively reduces defects in perovskite and suppresses non-radiative recombination losses.Simultaneously,amine ligands,which are repelled to the film surface and grain boundaries,form a thin insulating monolayer in the CRE areas,forcing charge carriers to transport through areas of the perovskite with fewer defects.This approach enables the crystallization control and defect-heal over the Cs_(0.19)FA_(0.81)PbI_(3-x-y)Br_(x)Cl_(y)perovskite films.Consequently,the champion perovskite solar cell achieved a power conversion efficiency of 22.04%,while mini-modules with an effective area of 64.8 cm^(2)reached a peak power conversion efficiency of 18.35%,demonstrating the significant potential for commercializing large-area perovskite solar cells.
基金Supported by the"Science and Technology Innovation Plan",Chinese Academy of Sciences(20194001882)National-level Entrepreneurship and Innovation Training for University Students in 2019(S201912649002).
文摘Carbon fiber is a kind of high-temperature fiber with high modulus and strength characteristics.Carbon fiber material is made of carbon fiber braid with carbon content>90%.Among them,resin-based carbon fiber reinforced composite material is often used as automotive structural material.Compared with the A36 steel commonly used in automobiles,the T300/5208 carbon fiber reinforced epoxy resin composite commonly used in automobiles has a higher tensile strength of 2500-3300 MPa and a lower density of 6.25 g/cm 3,showing great performance advantages.In this paper,by analyzing the trend of automobile lightweight,and exploring the development prospects of carbon fiber in the field of automobile lightweight,the literature in the Elsevier database is analyzed by scientific measurement analysis method,and the research hotspot in the field is listed.The relationship between the development of fiber materials and the promotion of policies is analyzed by comparing the number of carbon fiber automobile literature publications and key event nodes.This paper proposes a keyword-based influence calculation method.Through drawing analysis tools of information visualization scientific knowledge map and scientific measurement methods of keyword,it proposes the scientific measurement analysis literature of on-board carbon fiber,explores and discusses some frontier directions of automotive carbon fiber materials.The research provides reference for studying automobile lightweight carbon fiber material.
