With recent advances in the power conversion efficiency(PCE)of organic solar cells(OSCs)based on novel donor and non-fullerene acceptor(NFAs),improving the stability of these systems has become the most important issu...With recent advances in the power conversion efficiency(PCE)of organic solar cells(OSCs)based on novel donor and non-fullerene acceptor(NFAs),improving the stability of these systems has become the most important issue for their practical applications.Herein,an efficient and highly stable OSC,containing a novel polymer donor and a non-fullerene acceptor system,is reported.The OSC is based on an inverted device structure that utilizes a self-assembled fullerene monolayer(C60-SAM)as the cathode modification layer,and an efficient and highly stable OSC composes of a polymer donor of poly[4,8-bis(5-(2-ethyl hexyl)thiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene-alt-3-fluorothie-no[3,4-b]thiophene-2-c arboxylate](PTB7-Th)and a non-fullerene acceptor of(2,2’-((2 Z,2’Z)-(((4,4,9,9-Tetrakis(4-hexylphenyl)-4,9-dihydro-sindaceno[1,2-b:5,6-b’]dithiophene-2,7-diyl)bis(4-((2 ethylhexyl)oxy)thiophene-5,2-diyl))bis(metha nylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-l H-indene-2,1-diylidene))dimalononitrile)(IEICO-4 F)is presented,showing a PCE of 10%.It further achieves an extrapolated T80 lifetime(the time required to reach 80%of initial performance)of 34,000 h,operating under one sun illumination equivalent Based on an estimated solar irradiance of 1500 kWh/(m2 year)for China,a potential lifetime of22 years is inferred for the OSC.Further investigation reveals that the reported C60-SAM modification stabilizes the OSC active layer morphology by lowering the surface energy of the underlying ZnO electron transport layer and suppressing trap-assisted recombination,thereby improving photostability.The results of this work establish important guidelines for the development of non-fullerene based OSCs with enhanced stability and pave the way for the commercialization of OSC technology.展开更多
In this paper, biochar (BC) was used as raw material, activated by deionizing aqueous solution, NaCl solution, CA solution and HCl solution respectively. Epichlorohydrin (EPI) was used as crosslinking agent, and β-cy...In this paper, biochar (BC) was used as raw material, activated by deionizing aqueous solution, NaCl solution, CA solution and HCl solution respectively. Epichlorohydrin (EPI) was used as crosslinking agent, and β-cyclodextrin (β-CD) was used to modify biochar (BC). The prepared modified biochar materials were labeled with β-CDBC, β-CDBC-Na, β-CDBC-CA and β-CDBC-H, respectively. The infrared spectrum, X-ray diffractometer, scanning electron microscope and specific surface area of the four modified materials were tested. The results showed that the C-O stretching vibration peak at 1020 cm<sup>−</sup><sup>1</sup> of the modified materials was slightly offset compared with that of biochar. The characteristic absorption peaks of XRD pattern decrease obviously at 2θ = 26.7˚ and 29.5˚. It can be obviously observed on the electron microscope image that the surface is loaded or formed clathrates, and BET data and graphs also show that the specific surface area of the modified biochar is larger. Therefore, β-cyclodextrin successfully modified biochar and formed clathrates on the surface of biochar or was loaded in the pore structure of biochar, especially β-CDBC-CA achieved better modification effect. Because biochar and β-cyclodextrin raw materials are cheap, easy to prepare and green, and less prone to secondary pollution, it has a good advantage in environmental governance.展开更多
基金financially supported by the National Key Research and Development Program of China(2017YFA0206600)the National Natural Science Foundation of China(21761132001,91633301,51573057,and 51903095)+1 种基金the Fundamental Research Funds for the Central Universities(D2192160)performed in part on the SAXS/WAXS beamline at the Australian Synchrotron,which is part of the ANSTO.
文摘With recent advances in the power conversion efficiency(PCE)of organic solar cells(OSCs)based on novel donor and non-fullerene acceptor(NFAs),improving the stability of these systems has become the most important issue for their practical applications.Herein,an efficient and highly stable OSC,containing a novel polymer donor and a non-fullerene acceptor system,is reported.The OSC is based on an inverted device structure that utilizes a self-assembled fullerene monolayer(C60-SAM)as the cathode modification layer,and an efficient and highly stable OSC composes of a polymer donor of poly[4,8-bis(5-(2-ethyl hexyl)thiophen-2-yl)benzo[1,2-b:4,5-b’]dithiophene-alt-3-fluorothie-no[3,4-b]thiophene-2-c arboxylate](PTB7-Th)and a non-fullerene acceptor of(2,2’-((2 Z,2’Z)-(((4,4,9,9-Tetrakis(4-hexylphenyl)-4,9-dihydro-sindaceno[1,2-b:5,6-b’]dithiophene-2,7-diyl)bis(4-((2 ethylhexyl)oxy)thiophene-5,2-diyl))bis(metha nylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-l H-indene-2,1-diylidene))dimalononitrile)(IEICO-4 F)is presented,showing a PCE of 10%.It further achieves an extrapolated T80 lifetime(the time required to reach 80%of initial performance)of 34,000 h,operating under one sun illumination equivalent Based on an estimated solar irradiance of 1500 kWh/(m2 year)for China,a potential lifetime of22 years is inferred for the OSC.Further investigation reveals that the reported C60-SAM modification stabilizes the OSC active layer morphology by lowering the surface energy of the underlying ZnO electron transport layer and suppressing trap-assisted recombination,thereby improving photostability.The results of this work establish important guidelines for the development of non-fullerene based OSCs with enhanced stability and pave the way for the commercialization of OSC technology.
文摘In this paper, biochar (BC) was used as raw material, activated by deionizing aqueous solution, NaCl solution, CA solution and HCl solution respectively. Epichlorohydrin (EPI) was used as crosslinking agent, and β-cyclodextrin (β-CD) was used to modify biochar (BC). The prepared modified biochar materials were labeled with β-CDBC, β-CDBC-Na, β-CDBC-CA and β-CDBC-H, respectively. The infrared spectrum, X-ray diffractometer, scanning electron microscope and specific surface area of the four modified materials were tested. The results showed that the C-O stretching vibration peak at 1020 cm<sup>−</sup><sup>1</sup> of the modified materials was slightly offset compared with that of biochar. The characteristic absorption peaks of XRD pattern decrease obviously at 2θ = 26.7˚ and 29.5˚. It can be obviously observed on the electron microscope image that the surface is loaded or formed clathrates, and BET data and graphs also show that the specific surface area of the modified biochar is larger. Therefore, β-cyclodextrin successfully modified biochar and formed clathrates on the surface of biochar or was loaded in the pore structure of biochar, especially β-CDBC-CA achieved better modification effect. Because biochar and β-cyclodextrin raw materials are cheap, easy to prepare and green, and less prone to secondary pollution, it has a good advantage in environmental governance.
