Organic solar cells(OSCs)have gained conspicuous progress during the past few decades due to the development of materials and upgrading of the device structure.The power conversion efficiency(PCE)of the single-junctio...Organic solar cells(OSCs)have gained conspicuous progress during the past few decades due to the development of materials and upgrading of the device structure.The power conversion efficiency(PCE)of the single-junction device had surpassed 19%.The cathode interface layer(CIL),by optimizing the connection between the active layer and the cathode electrode,has become a momentous part to strengthen the performances of the OSCs.Simultaneously,CIL is also indispensable to illustrating the working mechanism of OSCs and enhancing the stability of the OSCs.In this essay,hybrid CILs in OSCs have been summarized.Firstly,the advancement and operating mechanism of OSCs,and the effects and relevant design rules of CIL are briefly concluded;secondly,the significant influence of CIL on enhancing the stability and PCE of OSCs is presented;thirdly,the characteristics of organic hybrid CIL and organic-inorganic hybrid CIL are introduced.Finally,the conclusion and outlook of CIL are summarized.展开更多
Recently,the power conversion efficiency(PCE)of organic solar cells(OSCs)has been substantially advanced by optimizing the acceptors and cathode interface layers(CILs).Perylene diimide(PDI)has been universally used in...Recently,the power conversion efficiency(PCE)of organic solar cells(OSCs)has been substantially advanced by optimizing the acceptors and cathode interface layers(CILs).Perylene diimide(PDI)has been universally used in acceptors and CILs for OSCs owing to its chemical and photothermal stability,structural tunability,and high electron mobility.Nevertheless,the high planarity of PDI tends to result in excessive aggregation,which suppresses the PCE of the OSCs.Notably,the bay-functionalization strategy of PDI can optimize the light absorption properties,charge transfer(CT),and aggregation behavior,which dramatically boost the PCE of OSCs.Here,a systematic summary of acceptors and CILs based on the bay-substitution of PDI is reviewed.First,the progress history and working principle of OSCs are reviewed,and the mechanisms of the acceptors and CILs,as well as the functional properties of the disparate positions of PDI,are elaborated.Second,the relationship between the performance and structure of the bay-modified PDI acceptors and CILs was discussed in depth.Finally,the conclusions and outlooks of acceptors and CILs for bay-substituted PDI are presented.This review provides valuable insights for optimizing the performance of OSCs by modifying the PDI in bay regions.展开更多
Lithium-ion batteries(LIBs)are increasingly required to operate under harsh conditions,particularly at low-temperature condition.Developing novel electrolytes is a facile and effective approach to elevate the electroc...Lithium-ion batteries(LIBs)are increasingly required to operate under harsh conditions,particularly at low-temperature condition.Developing novel electrolytes is a facile and effective approach to elevate the electrochemical performances of LIBs at low temperature.Herein,a dual-salt electrolyte consisting of(lithium bis(trifluoromethanesulfonyl)imide(Li TFSI)and lithium difluoro(oxalato)borate(Li ODFB))is proposed to regulate the solvation structure of Li^(+)ions and improve the reaction kinetics under low temperature.Based on the comprehensive electrochemical tests and theoretical computations,the introduction of LiODFB component not only effectively benefits the formation of cathode electrolyte interface(CEI)layer on the surface of LiFePO_(4)electrode,but also inhibits the chemical corrosion effect of Li TFSIcontaining electrolytes on Al foil.As expected,the optimized Li||LiFePO_(4)cells can display high reversible capacity of 117.0 m Ah/g after 100 cycles at-20℃.This work provides both theoretical basis and experimental guidance for the rational design of low-temperature resistant electrolytes.展开更多
基金supported by the National Natural Science Foundation of China(52263017,21965023,52173170,51973087,and22065025)the Science Fund for Distinguished Young Scholars of Jiangxi Province(20212ACB214009)+2 种基金the Natural Science Foundation of Jiangxi Province(20212ACB203010,20224BAB214007 and20212BAB204052)the Training Project of High-level and Highskilled Leading Talents of Jiangxi Province(2023)the Thousand Talents Plan of Jiangxi Province(jxsq2019201004 and jxsq2020101068)。
文摘Organic solar cells(OSCs)have gained conspicuous progress during the past few decades due to the development of materials and upgrading of the device structure.The power conversion efficiency(PCE)of the single-junction device had surpassed 19%.The cathode interface layer(CIL),by optimizing the connection between the active layer and the cathode electrode,has become a momentous part to strengthen the performances of the OSCs.Simultaneously,CIL is also indispensable to illustrating the working mechanism of OSCs and enhancing the stability of the OSCs.In this essay,hybrid CILs in OSCs have been summarized.Firstly,the advancement and operating mechanism of OSCs,and the effects and relevant design rules of CIL are briefly concluded;secondly,the significant influence of CIL on enhancing the stability and PCE of OSCs is presented;thirdly,the characteristics of organic hybrid CIL and organic-inorganic hybrid CIL are introduced.Finally,the conclusion and outlook of CIL are summarized.
基金supported by the National Natural Science Foundation of China(52263017,52173170,22369013,22169013)Natural Science Foundation of Jiangxi Province(20242BAB26057,20224BAB214007,20224ACB218004,20232BAB203046)+1 种基金Start-up Funds for Doctoral Research of Yuzhang Normal University(0001845002)Training Project of High-level and High-skilled Leading Talents of Jiangxi Province(2023)
文摘Recently,the power conversion efficiency(PCE)of organic solar cells(OSCs)has been substantially advanced by optimizing the acceptors and cathode interface layers(CILs).Perylene diimide(PDI)has been universally used in acceptors and CILs for OSCs owing to its chemical and photothermal stability,structural tunability,and high electron mobility.Nevertheless,the high planarity of PDI tends to result in excessive aggregation,which suppresses the PCE of the OSCs.Notably,the bay-functionalization strategy of PDI can optimize the light absorption properties,charge transfer(CT),and aggregation behavior,which dramatically boost the PCE of OSCs.Here,a systematic summary of acceptors and CILs based on the bay-substitution of PDI is reviewed.First,the progress history and working principle of OSCs are reviewed,and the mechanisms of the acceptors and CILs,as well as the functional properties of the disparate positions of PDI,are elaborated.Second,the relationship between the performance and structure of the bay-modified PDI acceptors and CILs was discussed in depth.Finally,the conclusions and outlooks of acceptors and CILs for bay-substituted PDI are presented.This review provides valuable insights for optimizing the performance of OSCs by modifying the PDI in bay regions.
基金the financial support from the S&T program of Hebei(Nos.215A4401D and 225A4404D)the Collaborative Innovation Center of Marine Science and Technology of Hainan University(No.XTCX2022HYC14)+3 种基金the Fundamental Research Funds for the Hebei University(No.2021YWF11)the Science Research Project of Hebei Education Department(No.QN2024087)the Xingtai City Natural Science Foundation(No.2023ZZ027)partially supported by the Pico Election Microscopy Center of Hainan University。
文摘Lithium-ion batteries(LIBs)are increasingly required to operate under harsh conditions,particularly at low-temperature condition.Developing novel electrolytes is a facile and effective approach to elevate the electrochemical performances of LIBs at low temperature.Herein,a dual-salt electrolyte consisting of(lithium bis(trifluoromethanesulfonyl)imide(Li TFSI)and lithium difluoro(oxalato)borate(Li ODFB))is proposed to regulate the solvation structure of Li^(+)ions and improve the reaction kinetics under low temperature.Based on the comprehensive electrochemical tests and theoretical computations,the introduction of LiODFB component not only effectively benefits the formation of cathode electrolyte interface(CEI)layer on the surface of LiFePO_(4)electrode,but also inhibits the chemical corrosion effect of Li TFSIcontaining electrolytes on Al foil.As expected,the optimized Li||LiFePO_(4)cells can display high reversible capacity of 117.0 m Ah/g after 100 cycles at-20℃.This work provides both theoretical basis and experimental guidance for the rational design of low-temperature resistant electrolytes.
