Additives play a crucial role in enhancing the photovoltaic performance of polymer solar cells(PSCs).However,the typical additives used to optimize blend morphology of PSCs are still high boiling-point solvents,while ...Additives play a crucial role in enhancing the photovoltaic performance of polymer solar cells(PSCs).However,the typical additives used to optimize blend morphology of PSCs are still high boiling-point solvents,while their trace residues may reduce device stability.Herein,an effective strategy of“solidification of solvent additive(SSA)”has been developed to convert additive from liquid to solid,by introducing a covalent bond into low-cost solvent diphenyl sulfide(DPS)to synthesize solid dibenzothiophene(DBT)in one-step,which achieves optimized morphology thus promoting efficiency and device stability.Owing to the fine planarity and volatilization of DBT,the DBT-processed films achieve ordered molecular crystallinity and suitable phase separation compared to the additive-free or DPS-treated ones.Importantly,the DBT-processed device also possesses improved light absorption,enhanced charge transport,and thus a champion efficiency of 17.9%is achieved in the PM6:Y6-based PSCs with an excellent additive component tolerance,reproducibility,and stability.Additionally,the DBT-processed PM6:L8-BO-based PSCs are further fabricated to study the universality of SSA strategy,offering an impressive efficiency approaching19%as one of the highest values in binary PSCs.In conclusion,this article developed a promising strategy named SSA to boost efficiency and improve stability of PSCs.展开更多
Near-infrared(NIR)-absorbing polymerized small molecule acceptors(PSMAs)based on a Y-series backbone(such as PY-IT)have been widely developed to fabricate efficient all-polymer solar cells(all-PSCs).However,medium-ban...Near-infrared(NIR)-absorbing polymerized small molecule acceptors(PSMAs)based on a Y-series backbone(such as PY-IT)have been widely developed to fabricate efficient all-polymer solar cells(all-PSCs).However,medium-bandgap PSMAs are often overlooked,while they as the third component can be expected to boost power conversion efficiencies(PCEs)of all-PSCs,mainly due to their up-shifted lowest unoccupied molecular orbital(LUMO)energy level,complimentary absorption,and diverse intermolecular interaction compared to the NIR-absorbing host acceptor.Herein,an IDIC-series medium-bandgap PSMA(P-ITTC)is developed and introduced as the third component into D18/PY-IT host,which can not only form complementary absorption and cascade energy level,but also finely optimize active layer morphology.Therefore,compared to the D18/PY-IT based parental all-PSCs,the ternary all-PSCs based on D18/PY-IT:P-ITTC obtain an increased exciton dissociation,charge transport,carrier lifetime,as well as suppressed charge recombination and energy loss.As a result,the ternary all-PSCs achieve a high PCE of 17.64%with a photovoltage of 0.96 V,both of which are among the top values in layer-by-layer typed all-PSCs.This work provides a method for the design and selection of the medium-bandgap third component to fabricate efficient all-PSCs.展开更多
基金the financial support from the Scientific Research Project of Education Department of Hunan Province(21C0091)the Open Fund of the State Key Laboratory of Luminescent Materials and Devices(South China University of Technology)(2023skllmd-13)+6 种基金the support from the National Natural Science Foundation of China(22209131,22005121)the open fund support from School of Materials Science and Engineering,Jiangsu Engineering Laboratory of Light-Electricity-Heat Energy-Converting Materials and Applications(GDRGCS2021002,GDRGCS2022003,GDRGCS2022002)the support from the National Key Research and Development Program of China(2022YFE0132400)the National Natural Science Foundation of China(21875182,52173023)the Key Scientific and Technological Innovation Team Project of Shaanxi Province(2020TD-002)111 Project 2.0(BP0618008)supported by the Director,Office of Science,Office of Basic Energy Sciences,of the U.S.Department of Energy(DE-AC0205CH11231)。
文摘Additives play a crucial role in enhancing the photovoltaic performance of polymer solar cells(PSCs).However,the typical additives used to optimize blend morphology of PSCs are still high boiling-point solvents,while their trace residues may reduce device stability.Herein,an effective strategy of“solidification of solvent additive(SSA)”has been developed to convert additive from liquid to solid,by introducing a covalent bond into low-cost solvent diphenyl sulfide(DPS)to synthesize solid dibenzothiophene(DBT)in one-step,which achieves optimized morphology thus promoting efficiency and device stability.Owing to the fine planarity and volatilization of DBT,the DBT-processed films achieve ordered molecular crystallinity and suitable phase separation compared to the additive-free or DPS-treated ones.Importantly,the DBT-processed device also possesses improved light absorption,enhanced charge transport,and thus a champion efficiency of 17.9%is achieved in the PM6:Y6-based PSCs with an excellent additive component tolerance,reproducibility,and stability.Additionally,the DBT-processed PM6:L8-BO-based PSCs are further fabricated to study the universality of SSA strategy,offering an impressive efficiency approaching19%as one of the highest values in binary PSCs.In conclusion,this article developed a promising strategy named SSA to boost efficiency and improve stability of PSCs.
基金M.Xiao thanks for the financial support from the Scientific Research Project of Education Department of Hunan Province(23B0167)the Open Funds of the State Key Laboratory of Luminescent Materials and Devices(South China University of Technology)(2023-skllmd-13)and NSFC(52403251)+4 种基金Q.Fan thanks for the support from the NSFC(22209131)W.Peng thanks for the support from Changzhou Leading Innovative Talent Introduction and Cultivation Project(CQ20230070)Jiangsu Enterprise Practice Project for Teachers of Higher Vocational Colleges(2024QYSJ058)the"Blue Project"of Jiangsu Province's Colleges,the Natural Science Foundation of the Jiangsu Higher Education Institutions of China(24KJB430006)J.Jia thanks the financial support from Guangdong Academy of Sciences(GDAS)'Project of Science and Technology Development(No.2022GDASZH-2022010111)。
文摘Near-infrared(NIR)-absorbing polymerized small molecule acceptors(PSMAs)based on a Y-series backbone(such as PY-IT)have been widely developed to fabricate efficient all-polymer solar cells(all-PSCs).However,medium-bandgap PSMAs are often overlooked,while they as the third component can be expected to boost power conversion efficiencies(PCEs)of all-PSCs,mainly due to their up-shifted lowest unoccupied molecular orbital(LUMO)energy level,complimentary absorption,and diverse intermolecular interaction compared to the NIR-absorbing host acceptor.Herein,an IDIC-series medium-bandgap PSMA(P-ITTC)is developed and introduced as the third component into D18/PY-IT host,which can not only form complementary absorption and cascade energy level,but also finely optimize active layer morphology.Therefore,compared to the D18/PY-IT based parental all-PSCs,the ternary all-PSCs based on D18/PY-IT:P-ITTC obtain an increased exciton dissociation,charge transport,carrier lifetime,as well as suppressed charge recombination and energy loss.As a result,the ternary all-PSCs achieve a high PCE of 17.64%with a photovoltage of 0.96 V,both of which are among the top values in layer-by-layer typed all-PSCs.This work provides a method for the design and selection of the medium-bandgap third component to fabricate efficient all-PSCs.
