利用微带圆环天线优良的多模特性,设计了一种基于八分之一圆环的微带天线。天线由1个八分之一(45°)的圆环,1条位于天线中心区域的窄缝和1排靠近天线边缘的短路钉组成。这些附加在天线上的缝隙和短路钉起到了激发环形微带天线多模...利用微带圆环天线优良的多模特性,设计了一种基于八分之一圆环的微带天线。天线由1个八分之一(45°)的圆环,1条位于天线中心区域的窄缝和1排靠近天线边缘的短路钉组成。这些附加在天线上的缝隙和短路钉起到了激发环形微带天线多模特性的作用,并进一步减小了天线尺寸。本文研究了这些附加结构对环天线的影响,并经过仿真、优化获得了具有3个频点的微带天线。天线的实测结果表明,该天线可以很好地工作在0.9 GHz,1.8 GHz和2.4 GHz,增益分别达到了4 d Bi,5 d Bi,6 d Bi,工作带宽分别为7 MHz,12 MHz和20 MHz。展开更多
A novel electron donating unit,namely N-octyl-N-phenyl-thiophene(OPT),was designed in preparing electron acceptors with non-fused ring chemical structures.By introducing different functional atoms/groups into the para...A novel electron donating unit,namely N-octyl-N-phenyl-thiophene(OPT),was designed in preparing electron acceptors with non-fused ring chemical structures.By introducing different functional atoms/groups into the para-position of phenyl in the OPT units,three non-fused ring acceptors(NFREAs),C8-2F,FC8-2F and MeC8-2F,were synthesized.The absorption spectrum of the three acceptors can be extended to about 950 nm with band-gaps of 1.28—1.32 eV due to the strong electron donating ability of OPT.The frontier molecular orbital distribution of OPT based molecules obtained by quantum chemistry calculation results reveals that their energy alignment can be finely tuned to meet different requirements.Moreover,by changing the substituents on the OPT units,their Flory-Huggins interaction parameter(χ)with the donor will be greatly influenced and different phase separation behavior can be accomplished.After blended with PBDB-TF,the FC8-2F-based cell yields short circuit current density(J_(sc))of 23.21 mA·cm^(-2),fill factor(FF)of 72.11%and the highest power conversion efficiency(PCE)of 12.42%.This work provides a new pathway for molecular design of new NFREAs,and demonstrates the application potential of OPT unit in realizing low band-gap photovoltaic materials.展开更多
文摘利用微带圆环天线优良的多模特性,设计了一种基于八分之一圆环的微带天线。天线由1个八分之一(45°)的圆环,1条位于天线中心区域的窄缝和1排靠近天线边缘的短路钉组成。这些附加在天线上的缝隙和短路钉起到了激发环形微带天线多模特性的作用,并进一步减小了天线尺寸。本文研究了这些附加结构对环天线的影响,并经过仿真、优化获得了具有3个频点的微带天线。天线的实测结果表明,该天线可以很好地工作在0.9 GHz,1.8 GHz和2.4 GHz,增益分别达到了4 d Bi,5 d Bi,6 d Bi,工作带宽分别为7 MHz,12 MHz和20 MHz。
基金This work was financially supported by the National Natural Science Foundation of China(21835006,22075017)the National Key Research and Development Program of China(2019YFE0116700).
文摘A novel electron donating unit,namely N-octyl-N-phenyl-thiophene(OPT),was designed in preparing electron acceptors with non-fused ring chemical structures.By introducing different functional atoms/groups into the para-position of phenyl in the OPT units,three non-fused ring acceptors(NFREAs),C8-2F,FC8-2F and MeC8-2F,were synthesized.The absorption spectrum of the three acceptors can be extended to about 950 nm with band-gaps of 1.28—1.32 eV due to the strong electron donating ability of OPT.The frontier molecular orbital distribution of OPT based molecules obtained by quantum chemistry calculation results reveals that their energy alignment can be finely tuned to meet different requirements.Moreover,by changing the substituents on the OPT units,their Flory-Huggins interaction parameter(χ)with the donor will be greatly influenced and different phase separation behavior can be accomplished.After blended with PBDB-TF,the FC8-2F-based cell yields short circuit current density(J_(sc))of 23.21 mA·cm^(-2),fill factor(FF)of 72.11%and the highest power conversion efficiency(PCE)of 12.42%.This work provides a new pathway for molecular design of new NFREAs,and demonstrates the application potential of OPT unit in realizing low band-gap photovoltaic materials.
