Polymerizing the narrow bandgap small-molecule architecture with a conjugated linking unit(or called the polymerized small molecule acceptors(PSMAs))is a promising strategy to design polymer acceptors for efficient al...Polymerizing the narrow bandgap small-molecule architecture with a conjugated linking unit(or called the polymerized small molecule acceptors(PSMAs))is a promising strategy to design polymer acceptors for efficient all polymer solar cells(all-PSCs).Currently,the fused-ring-based small molecule acceptors(SMAs)are preferred monomers to design efficient PSMAs,leaving the challenge of reducing the materials cost.In this work,we firstly employ nonfused-core SMA with simple synthetic procedures to design PSMAs(namely PBTI-H,PBTI-F and PBTI-Cl)to address this issue.Relative to the fused-ring based counterparts,these three PSMAs exhibit much higher figure-of-merit value.Additionally,a power-conversion efficiency of 8.80%is achieved in the PBTI-Cl-based all-PSC.The results offer an attractive approach to design low-cost PSMAs for efficient all-PSCs.展开更多
Power electronic conversion plays an important role in flexible AC or DC transmission and distribution systems,integration of renewable energy resources,and energy storage systems to enhance efficiency,controllability...Power electronic conversion plays an important role in flexible AC or DC transmission and distribution systems,integration of renewable energy resources,and energy storage systems to enhance efficiency,controllability,stability,and reliability of the grid.The efficiency and reliability of power electronic conversion are critical to power system applications.One way to enhance the efficiency and reliability of power electronic conversion is soft-switching technology.This paper introduces a generic zero-voltage-switching(ZVS)technique based on silicon carbide(Si C)power device.Using the proposed ZVS technique,all semiconductor switching devices in a power converter can realize ZVS operations.Next,the applications of the ZVS technique in different power electronic conversion systems such as photovoltaic inverters,wind power systems,energy storage systems and flexible AC transmission system devices are discussed.Finally,as an example,the operation performance and efficiency improvement of a Si C metal-oxide-semiconductor field-effect transistor(MOSFET)ZVS back-to-back converter are discussed.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(Nos.22022509,51873140 and 51820105003)Jiangsu Provincial Natural Science Foundation(No.BK20190095)+1 种基金Natural Science Foundation of the Jiangsu Higher Education Institutions of China(No.21KJA150006)Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD),and Collaborative Innovation Center of Suzhou Nano Science and Technology.
文摘Polymerizing the narrow bandgap small-molecule architecture with a conjugated linking unit(or called the polymerized small molecule acceptors(PSMAs))is a promising strategy to design polymer acceptors for efficient all polymer solar cells(all-PSCs).Currently,the fused-ring-based small molecule acceptors(SMAs)are preferred monomers to design efficient PSMAs,leaving the challenge of reducing the materials cost.In this work,we firstly employ nonfused-core SMA with simple synthetic procedures to design PSMAs(namely PBTI-H,PBTI-F and PBTI-Cl)to address this issue.Relative to the fused-ring based counterparts,these three PSMAs exhibit much higher figure-of-merit value.Additionally,a power-conversion efficiency of 8.80%is achieved in the PBTI-Cl-based all-PSC.The results offer an attractive approach to design low-cost PSMAs for efficient all-PSCs.
基金supported by the National Natural Science Foundation of China(No.51777189).
文摘Power electronic conversion plays an important role in flexible AC or DC transmission and distribution systems,integration of renewable energy resources,and energy storage systems to enhance efficiency,controllability,stability,and reliability of the grid.The efficiency and reliability of power electronic conversion are critical to power system applications.One way to enhance the efficiency and reliability of power electronic conversion is soft-switching technology.This paper introduces a generic zero-voltage-switching(ZVS)technique based on silicon carbide(Si C)power device.Using the proposed ZVS technique,all semiconductor switching devices in a power converter can realize ZVS operations.Next,the applications of the ZVS technique in different power electronic conversion systems such as photovoltaic inverters,wind power systems,energy storage systems and flexible AC transmission system devices are discussed.Finally,as an example,the operation performance and efficiency improvement of a Si C metal-oxide-semiconductor field-effect transistor(MOSFET)ZVS back-to-back converter are discussed.
