Sequential processing(SqP)of the active layer offers independent optimization of the donor and acceptor with more targeted solvent design,which is considered the most promising strategy for achieving efficient organic...Sequential processing(SqP)of the active layer offers independent optimization of the donor and acceptor with more targeted solvent design,which is considered the most promising strategy for achieving efficient organic solar cells(OSCs).In the SqP method,the favorable interpenetrating network seriously depends on the fine control of the bottom layer swelling.However,the choice of solvent(s)for both the donor and acceptor have been mostly based on a trial-and-error manner.A single solvent often cannot achieve sufficient yet not excessive swelling,which has long been a difficulty in the high efficient SqP OSCs.Herein,two new isomeric molecules are introduced to fine-tune the nucleation and crystallization dynamics that allows judicious control over the swelling of the bottom layer.The strong non-covalent interaction between the isomeric molecule and active materials provides an excellent driving force for optimize the swelling-process.Among them,the molecule with high dipole moment promotes earlier nucleation of the PM6 and provides extended time for crystallization during SqP,improving bulk morphology and vertical phase segregation.As a result,champion efficiencies of 17.38%and 20.00%(certified 19.70%)are achieved based on PM6/PYF-T-o(all-polymer)and PM6/BTP-eC9 devices casted by toluene solvent.展开更多
The emergence of polymerized small molecule acceptors(PSMAs)has significantly improved the performance of all-polymer solar cells(all-PSCs).However,the pace of device engineering lacks behind that of materials develop...The emergence of polymerized small molecule acceptors(PSMAs)has significantly improved the performance of all-polymer solar cells(all-PSCs).However,the pace of device engineering lacks behind that of materials development,so that a majority of the PSMAs have not fulfilled their potentials.Furthermore,most high-performance all-PSCs rely on the use of chloroform as the processing solvent.For instance,the recent highperformance PSMA,named PJ1-γ,with high LUMO,and HOMO levels,could only achieve a PCE of 16.1%with a high-energy-level donor(JD40)using chloroform.Herein,we present a methodology combining sequential processing(SqP)with the addition of 0.5%wt PC_(71)BM as a solid additive(SA)to achieve an impressive efficiency of 18.0%for all-PSCs processed from toluene,an aromatic hydrocarbon solvent.Compared to the conventional blend-casting(BC)method whose best efficiency(16.7%)could only be achieved using chloroform,the SqP method significantly boosted the device efficiency using toluene as the processing solvent.In addition,the donor we employ is the classic PM6 that has deeper energy levels than JD40,which provides low energy loss for the device.We compare the results with another PSMA(PYF-T-o)with the same method.Finally,an improved photostability of the SqP devices with the incorporation of SA is demonstrated.展开更多
In organic solar cells(OSCs),typical methods for fabricating the ternary active layer are blend-casting(BC)or two-step sequential processing(SqP-2T),where all three or at least two components are blended together,whic...In organic solar cells(OSCs),typical methods for fabricating the ternary active layer are blend-casting(BC)or two-step sequential processing(SqP-2T),where all three or at least two components are blended together,which affect the crystallization/aggregation behavior of each other during solid-film formation.Herein,we introduce for the first time a novel three-step sequential processing method,termed SqP-3T,which utilizes hydrocarbon solvents to prepare high-quality ternary active layers.Compared to the SqP-2T and BC techniques,SqP-3T yields an active layer with a higher acceptor ratio on its upper surface and exhibits a longer crystal coherence length in the out-of-plane direction(21.42 A).These characteristics enhance charge transport and collection.Additionally,SqP-3T devices demonstrate nearly a twofold increase in the transient photovoltage decay constant(up to 2.82μs)that is related to carrier lifetime to a certain extent,leading to reduced recombination losses.Consequently,the SqP-3T device achieves a high fill factor(75.67%)and a high short-circuit current density(27.35 mA/cm^(2)),contributing to a power conversion efficiency of 19.2%.These results highlight the potential of SqP-3T or a multi-step sequential deposition process in the production of ternary or multicomponent OSCs,which could be adopted by more material systems in the future.展开更多
基金supported by the Guangdong Basic and Applied Basic Research Foundation (2022A1515010875)National Natural Science Foundation of China (12404480)+4 种基金Shenzhen Science and Technology Program (JCYJ20240813113238050, JCYJ20240813113306008)Education Department of Guangdong Province (2021KCXTD045)National Natural Science Foundation of China (12274303)the Shenzhen Key Laboratory of Applied Technologies of Super-Diamond and Functional Crystals (ZDSYS20230626091303007)Characteristic Innovation Foundation of Higher Education Institutions of Guangdong Province (2022KTSCX116)
文摘Sequential processing(SqP)of the active layer offers independent optimization of the donor and acceptor with more targeted solvent design,which is considered the most promising strategy for achieving efficient organic solar cells(OSCs).In the SqP method,the favorable interpenetrating network seriously depends on the fine control of the bottom layer swelling.However,the choice of solvent(s)for both the donor and acceptor have been mostly based on a trial-and-error manner.A single solvent often cannot achieve sufficient yet not excessive swelling,which has long been a difficulty in the high efficient SqP OSCs.Herein,two new isomeric molecules are introduced to fine-tune the nucleation and crystallization dynamics that allows judicious control over the swelling of the bottom layer.The strong non-covalent interaction between the isomeric molecule and active materials provides an excellent driving force for optimize the swelling-process.Among them,the molecule with high dipole moment promotes earlier nucleation of the PM6 and provides extended time for crystallization during SqP,improving bulk morphology and vertical phase segregation.As a result,champion efficiencies of 17.38%and 20.00%(certified 19.70%)are achieved based on PM6/PYF-T-o(all-polymer)and PM6/BTP-eC9 devices casted by toluene solvent.
基金supported by the Guangdong Basic and Applied Basic Research Foundation(2022A1515010875)Guangdong Basic and Applied Basic Research Foundation(2021A1515110017)+10 种基金Natural Science Foundation of Top Talent of SZTU(grant no.20200205)Project of Education Commission of Guangdong Province of China(2021KQNCX080)Research on the electrochemical reaction mechanism of the anode of mediumlow temperature direct ammonia SOFCs(20231063020006)the project of al solid-state high energy density energy storage system(20221063010031)the project of Shenzhen Overseas Talent upon Industrialization of 1kw stack for direct ammonia SOFCs(20221061010002)Guangdong Basic and Applied Basic Research Foundation(No.2019A1515011673)Education Department of Guangdong Province(No.2021KCXTD045)National Natural Science Foundation of China(No.12274303)the support from the Fundamental Research Funds for the Central Universities(2232023A-01)NSFC No.52103202beamline BL16B1 at Shanghai Synchrotron Radiation Facility(SSRF)for the synchrotron experiment
文摘The emergence of polymerized small molecule acceptors(PSMAs)has significantly improved the performance of all-polymer solar cells(all-PSCs).However,the pace of device engineering lacks behind that of materials development,so that a majority of the PSMAs have not fulfilled their potentials.Furthermore,most high-performance all-PSCs rely on the use of chloroform as the processing solvent.For instance,the recent highperformance PSMA,named PJ1-γ,with high LUMO,and HOMO levels,could only achieve a PCE of 16.1%with a high-energy-level donor(JD40)using chloroform.Herein,we present a methodology combining sequential processing(SqP)with the addition of 0.5%wt PC_(71)BM as a solid additive(SA)to achieve an impressive efficiency of 18.0%for all-PSCs processed from toluene,an aromatic hydrocarbon solvent.Compared to the conventional blend-casting(BC)method whose best efficiency(16.7%)could only be achieved using chloroform,the SqP method significantly boosted the device efficiency using toluene as the processing solvent.In addition,the donor we employ is the classic PM6 that has deeper energy levels than JD40,which provides low energy loss for the device.We compare the results with another PSMA(PYF-T-o)with the same method.Finally,an improved photostability of the SqP devices with the incorporation of SA is demonstrated.
基金supported by Guangdong Basic and Applied Basic Research Foundation(2025A1515012147)National Natural Science Foundation of China(12404480)+5 种基金Shenzhen Science and Technology Program(JCYJ20240813113238050,JCYJ20240813113306008)Characteristic Innovation Foundation of Higher Education Institutions of Guangdong Province(2022KTSCX116)Education Department of Guangdong Province(2021KCXTD045)National Natural Science Foundation of China(12274303)Shenzhen Key Laboratory of Applied Technologies of Super-Diamond and Functional Crystals(ZDSYS20230626091303007)National Natural Science Foundation of China(52103202).
文摘In organic solar cells(OSCs),typical methods for fabricating the ternary active layer are blend-casting(BC)or two-step sequential processing(SqP-2T),where all three or at least two components are blended together,which affect the crystallization/aggregation behavior of each other during solid-film formation.Herein,we introduce for the first time a novel three-step sequential processing method,termed SqP-3T,which utilizes hydrocarbon solvents to prepare high-quality ternary active layers.Compared to the SqP-2T and BC techniques,SqP-3T yields an active layer with a higher acceptor ratio on its upper surface and exhibits a longer crystal coherence length in the out-of-plane direction(21.42 A).These characteristics enhance charge transport and collection.Additionally,SqP-3T devices demonstrate nearly a twofold increase in the transient photovoltage decay constant(up to 2.82μs)that is related to carrier lifetime to a certain extent,leading to reduced recombination losses.Consequently,the SqP-3T device achieves a high fill factor(75.67%)and a high short-circuit current density(27.35 mA/cm^(2)),contributing to a power conversion efficiency of 19.2%.These results highlight the potential of SqP-3T or a multi-step sequential deposition process in the production of ternary or multicomponent OSCs,which could be adopted by more material systems in the future.
