The development of high-performance non-fullerene acceptors with extended exciton diffusion lengths has positioned the sequential layer-by-layer(LBL)solution processing technique as a promising approach for fabricatin...The development of high-performance non-fullerene acceptors with extended exciton diffusion lengths has positioned the sequential layer-by-layer(LBL)solution processing technique as a promising approach for fabricating high-performance and large-area organic solar cells(OSCs).This method allows for the independent dissolution and deposition of donor and acceptor materials,enabling precise morphology control.In this review,we provide a comprehensive overview of the LBL processing technique,focusing on the morphology of the active layer.The swelling intercalation phase-separation(SIPS)model is introduced as the mainstream theory of morphology evolution,with a detailed discussion on vertical phase separation.We summarize recent strategies for morphology optimization.Additionally,we review the progress in LBL-based large-area device and module fabrication,as well as green processing approaches.Finally,we highlight current challenges and future prospects,paving the way for the commercialization of LBL-processed OSCs.展开更多
Ternary strategy has demonstrated great potential in promoting the power conversion efficiency(PCE)of bulk heterojunction organic solar cells(BHJ OSCs).Two new polymer donors,TPQ-2 F-2 Cl and TPQ-2 F-4 F,were synthesi...Ternary strategy has demonstrated great potential in promoting the power conversion efficiency(PCE)of bulk heterojunction organic solar cells(BHJ OSCs).Two new polymer donors,TPQ-2 F-2 Cl and TPQ-2 F-4 F,were synthesized with chlorinated and fluorinated aromatic side chains,respectively,which contributed to distinct noncovalent interactions.Compared with the PM 6:L 8-BO host system,the TPQ-2 F-2 Cl based ternary OSCs obtained enhanced exciton dissociation and more balanced carrier mobility.Moreover,benefiting from the favorable miscibility of the PM 6:L 8-BO:TPQ-2 F-2 Cl blend,the ternary blending film featured a well-defined fibrillar morphology and improved molecular ordering.Consequently,the optimal PM 6:L 8-BO:TPQ-2 F-2 Cl device achieved a more outstanding PCE of 18.2%,a higher open circuit voltage(V_(oc)),and a better fill factor(FF)in comparison with the binary device(PCE=17.7%).In contrast,the addition of TPQ-2 F-4 F would generate excessive aggregation of blend,thereby reducing the PCE of ternary OSCs(16.0%).This work shows a promising idea for designing efficient third component donor polymers.展开更多
Highly efficient organic solar cells(OSCs)are normally produced using the halogenated solvents chloroform or chlorobenzene,which present challenges for scalable manufacturing due to their toxicity,narrow processing wi...Highly efficient organic solar cells(OSCs)are normally produced using the halogenated solvents chloroform or chlorobenzene,which present challenges for scalable manufacturing due to their toxicity,narrow processing window and low boiling point.Herein,we develop a novel high-speed doctor-blading technique that significantly reduces the required concentration,facilitating the use of eco-friendly,non-halogenated solvents as alternatives to chloroform or chlorobenzene.By utilizing two widely used high-boiling,non-halogenated green solvents-o-xylene(o-XY)and toluene(Tol)-in the fabrication of PM 6:L 8-BO,we achieve power conversion efficiencies(PCEs)of 18.20%and 17.36%,respectively.Additionally,a module fabricated with o-XY demonstrates a notable PCE of 16.07%.In-situ testing and morphological analysis reveal that the o-XY coating process extends the liquid-to-solid transition stage to 6 s,significantly longer than the 1.7 s observed with Tol processing.This prolonged transition phase is crucial for improving the crystallinity of the thin film,reducing defect-mediated recombination,and enhancing carrier mobility,which collectively contribute to superior PCEs.展开更多
The rapid development of global economy brings the increasing demand for energy.The excessive consumption of traditional energy has not only led to the depletion of energy resources,but has also resulted in significan...The rapid development of global economy brings the increasing demand for energy.The excessive consumption of traditional energy has not only led to the depletion of energy resources,but has also resulted in significant global environmental pollution and climate change[1,2].In response to these challenges,promoting the transformation of energy structure has become the common goal of all countries[3].Within this context,new energy materials and devices has gradually become one of the key directions in global scientific and technological development[4].展开更多
The method to fluorinate the terminal group has achieved remarkable success and been widely used to fine-tune the intrinsic properties of organic acceptor materials.Referring to chlorination,however,it gets less atten...The method to fluorinate the terminal group has achieved remarkable success and been widely used to fine-tune the intrinsic properties of organic acceptor materials.Referring to chlorination,however,it gets less attention and remains ambiguous effect on organic photovoltaic(OPV)cells.Herein,a new non-fullerene acceptor named Y19 was reported with benzotriazole as the electron-deficient core and 2Cl-ICs as the strong electron-withdrawing end groups.Y19 exhibits a wide film absorption band from 600 nm to 948 nm and low LUMO(the lowest unoccupied molecular orbital)energy level of−3.95 eV.Photovoltaic devices based on PM6:Y19 show high-power conversion efficiency(PCE)of 12.76%with high open-circuit voltage(Voc)of 0.84 V,short-circuit current density(Jsc)of 22.38 mA/cm2 and fill factor(FF)of 68.18%.Broad external quantum efficiency(EQE)response of over 60%in the range of 480−860 nm can be obtained.This study demonstrates that chlorination,as a low-cost molecular design strategy,has its own superiorities to improve device performance and promote the potential application in OPV.展开更多
The rational design of polymer acceptors with strong and broad absorption is critical to improve photovoltaic performance.In this work,a new polymer acceptor PY9-T based on heptacyclic benzotriazole(Y9-C16)as a buildi...The rational design of polymer acceptors with strong and broad absorption is critical to improve photovoltaic performance.In this work,a new polymer acceptor PY9-T based on heptacyclic benzotriazole(Y9-C16)as a building block and thiophene unit as the linking unit was synthesized,which exhibited a low bandgap(1.37 eV)and a high extinction coefficient of the neat film(1.44×10^(5) cm^(−1)).When PY9-T was blended with the wide bandgap polymer donor PBDB-T,the all-polymer solar cells(APSCs)showed a high power conversion efficiency(PCE)of 10.45%with both high open circuit voltage of 0.881 V and short-circuit current density of 19.82 mA/cm^(2).In addition,APSCs based on PY9-T show good thermal stability,as evidenced by slight changes morphologies when annealed at 100℃.These results suggest that Y9-C16 provides a new building block to develop efficient and stable polymer acceptors.展开更多
基金Project(22408404)supported by the National Natural Science Foundation of China。
文摘The development of high-performance non-fullerene acceptors with extended exciton diffusion lengths has positioned the sequential layer-by-layer(LBL)solution processing technique as a promising approach for fabricating high-performance and large-area organic solar cells(OSCs).This method allows for the independent dissolution and deposition of donor and acceptor materials,enabling precise morphology control.In this review,we provide a comprehensive overview of the LBL processing technique,focusing on the morphology of the active layer.The swelling intercalation phase-separation(SIPS)model is introduced as the mainstream theory of morphology evolution,with a detailed discussion on vertical phase separation.We summarize recent strategies for morphology optimization.Additionally,we review the progress in LBL-based large-area device and module fabrication,as well as green processing approaches.Finally,we highlight current challenges and future prospects,paving the way for the commercialization of LBL-processed OSCs.
基金Projects(52125306,21875286)supported by the National Natural Science Foundation of China。
文摘Ternary strategy has demonstrated great potential in promoting the power conversion efficiency(PCE)of bulk heterojunction organic solar cells(BHJ OSCs).Two new polymer donors,TPQ-2 F-2 Cl and TPQ-2 F-4 F,were synthesized with chlorinated and fluorinated aromatic side chains,respectively,which contributed to distinct noncovalent interactions.Compared with the PM 6:L 8-BO host system,the TPQ-2 F-2 Cl based ternary OSCs obtained enhanced exciton dissociation and more balanced carrier mobility.Moreover,benefiting from the favorable miscibility of the PM 6:L 8-BO:TPQ-2 F-2 Cl blend,the ternary blending film featured a well-defined fibrillar morphology and improved molecular ordering.Consequently,the optimal PM 6:L 8-BO:TPQ-2 F-2 Cl device achieved a more outstanding PCE of 18.2%,a higher open circuit voltage(V_(oc)),and a better fill factor(FF)in comparison with the binary device(PCE=17.7%).In contrast,the addition of TPQ-2 F-4 F would generate excessive aggregation of blend,thereby reducing the PCE of ternary OSCs(16.0%).This work shows a promising idea for designing efficient third component donor polymers.
基金Project(2022YFB3803300)supported by the National Key Research and Development Program of ChinaProjects(U23A20138,52173192)supported by the National Natural Science Foundation of China+1 种基金Project(GZC20233148)supported by the Postdoctoral Fellowship Program of CPSF,ChinaProject(140050043)supported by the Central South University Postdoctoral Research Funding,China。
文摘Highly efficient organic solar cells(OSCs)are normally produced using the halogenated solvents chloroform or chlorobenzene,which present challenges for scalable manufacturing due to their toxicity,narrow processing window and low boiling point.Herein,we develop a novel high-speed doctor-blading technique that significantly reduces the required concentration,facilitating the use of eco-friendly,non-halogenated solvents as alternatives to chloroform or chlorobenzene.By utilizing two widely used high-boiling,non-halogenated green solvents-o-xylene(o-XY)and toluene(Tol)-in the fabrication of PM 6:L 8-BO,we achieve power conversion efficiencies(PCEs)of 18.20%and 17.36%,respectively.Additionally,a module fabricated with o-XY demonstrates a notable PCE of 16.07%.In-situ testing and morphological analysis reveal that the o-XY coating process extends the liquid-to-solid transition stage to 6 s,significantly longer than the 1.7 s observed with Tol processing.This prolonged transition phase is crucial for improving the crystallinity of the thin film,reducing defect-mediated recombination,and enhancing carrier mobility,which collectively contribute to superior PCEs.
文摘The rapid development of global economy brings the increasing demand for energy.The excessive consumption of traditional energy has not only led to the depletion of energy resources,but has also resulted in significant global environmental pollution and climate change[1,2].In response to these challenges,promoting the transformation of energy structure has become the common goal of all countries[3].Within this context,new energy materials and devices has gradually become one of the key directions in global scientific and technological development[4].
基金Project(21875286)supported by the National Natural Science Foundation of China。
文摘The method to fluorinate the terminal group has achieved remarkable success and been widely used to fine-tune the intrinsic properties of organic acceptor materials.Referring to chlorination,however,it gets less attention and remains ambiguous effect on organic photovoltaic(OPV)cells.Herein,a new non-fullerene acceptor named Y19 was reported with benzotriazole as the electron-deficient core and 2Cl-ICs as the strong electron-withdrawing end groups.Y19 exhibits a wide film absorption band from 600 nm to 948 nm and low LUMO(the lowest unoccupied molecular orbital)energy level of−3.95 eV.Photovoltaic devices based on PM6:Y19 show high-power conversion efficiency(PCE)of 12.76%with high open-circuit voltage(Voc)of 0.84 V,short-circuit current density(Jsc)of 22.38 mA/cm2 and fill factor(FF)of 68.18%.Broad external quantum efficiency(EQE)response of over 60%in the range of 480−860 nm can be obtained.This study demonstrates that chlorination,as a low-cost molecular design strategy,has its own superiorities to improve device performance and promote the potential application in OPV.
基金Project(21875286)supported by the National Natural Science Foundation of China。
文摘The rational design of polymer acceptors with strong and broad absorption is critical to improve photovoltaic performance.In this work,a new polymer acceptor PY9-T based on heptacyclic benzotriazole(Y9-C16)as a building block and thiophene unit as the linking unit was synthesized,which exhibited a low bandgap(1.37 eV)and a high extinction coefficient of the neat film(1.44×10^(5) cm^(−1)).When PY9-T was blended with the wide bandgap polymer donor PBDB-T,the all-polymer solar cells(APSCs)showed a high power conversion efficiency(PCE)of 10.45%with both high open circuit voltage of 0.881 V and short-circuit current density of 19.82 mA/cm^(2).In addition,APSCs based on PY9-T show good thermal stability,as evidenced by slight changes morphologies when annealed at 100℃.These results suggest that Y9-C16 provides a new building block to develop efficient and stable polymer acceptors.
