Comprehensive Summary The power conversion efficiencies(PCEs)of non-fullerene acceptor(NFA)-based organic solar cells(OSCs)have undergone an exciting development in recent years,but the poor intrinsic stability of exo...Comprehensive Summary The power conversion efficiencies(PCEs)of non-fullerene acceptor(NFA)-based organic solar cells(OSCs)have undergone an exciting development in recent years,but the poor intrinsic stability of exocyclic ethylene bridges in NFAs poses a significant challenge to their commercialization.In this work,we propose a new pyran-locking strategy that can stabilize the exocyclic ethylene bridge connecting the strong electron-deficient 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile end group,based on which two dimerized NFAs(ITBIC-F and TBTBIC-F)with an A-D-π-A-π-D-A structure have been successfully synthesized with significantly improved chemical and photochemical stabilities in comparison with traditional NFAs without the ring-locked structure.The ITBIC-F and TBTBIC-F-based OSCs not only achieve promising PCEs of 13.03%and 10.01%,respectively,but also show good device stability;the ITBIC-F-based unencapsulated devices can retain 75%and 62%of their initial PCEs,respectively,under continuous heat(85°C)and light irradiation(LED,100 mW·cm^(–2))in a nitrogen atmosphere.展开更多
A series of new fluoro-containing copolymers have been synthesized by a Mitsunobu reaction with 4,4＇-（hexafluoroisopropylidene） bisphenol A（6FBPA） and the corresponding N,N-dihydroxyethylaminoaryl azo or ring-loc...A series of new fluoro-containing copolymers have been synthesized by a Mitsunobu reaction with 4,4＇-（hexafluoroisopropylidene） bisphenol A（6FBPA） and the corresponding N,N-dihydroxyethylaminoaryl azo or ring-locked triene compounds, which have high thermal stability and good solubility in organic solvents.The nonlinear optical（NLO） measurements made by Marker fringe method at 1064 nm indicate that the copolymers embedded with the ring-locked triene and azo chromophores exhibit higher macroscopic nonlinear optical coefficient（70.2 pm/V and 26.5-34.6 pm/V,respectively）.Thermal analysis and UV-visible absorption spectra show that the copolymers have good thermal stability（T_d= 264-319℃） and optical transparency （λ_（max）500 nm）.展开更多
基金the National Natural Science Foundation of China(Grant No.22175067).
文摘Comprehensive Summary The power conversion efficiencies(PCEs)of non-fullerene acceptor(NFA)-based organic solar cells(OSCs)have undergone an exciting development in recent years,but the poor intrinsic stability of exocyclic ethylene bridges in NFAs poses a significant challenge to their commercialization.In this work,we propose a new pyran-locking strategy that can stabilize the exocyclic ethylene bridge connecting the strong electron-deficient 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile end group,based on which two dimerized NFAs(ITBIC-F and TBTBIC-F)with an A-D-π-A-π-D-A structure have been successfully synthesized with significantly improved chemical and photochemical stabilities in comparison with traditional NFAs without the ring-locked structure.The ITBIC-F and TBTBIC-F-based OSCs not only achieve promising PCEs of 13.03%and 10.01%,respectively,but also show good device stability;the ITBIC-F-based unencapsulated devices can retain 75%and 62%of their initial PCEs,respectively,under continuous heat(85°C)and light irradiation(LED,100 mW·cm^(–2))in a nitrogen atmosphere.
基金supported by the National Natural Science Foundation(No20774039)the National Basic Research Program of China(No2007CB925103)
文摘A series of new fluoro-containing copolymers have been synthesized by a Mitsunobu reaction with 4,4＇-（hexafluoroisopropylidene） bisphenol A（6FBPA） and the corresponding N,N-dihydroxyethylaminoaryl azo or ring-locked triene compounds, which have high thermal stability and good solubility in organic solvents.The nonlinear optical（NLO） measurements made by Marker fringe method at 1064 nm indicate that the copolymers embedded with the ring-locked triene and azo chromophores exhibit higher macroscopic nonlinear optical coefficient（70.2 pm/V and 26.5-34.6 pm/V,respectively）.Thermal analysis and UV-visible absorption spectra show that the copolymers have good thermal stability（T_d= 264-319℃） and optical transparency （λ_（max）500 nm）.
