Despite significant advancements in the power conversion efficiency(PCE)of perovskite/silicon tandem solar cells,improving carrier management in top cells remains challenging due to the defective dual interfaces of wi...Despite significant advancements in the power conversion efficiency(PCE)of perovskite/silicon tandem solar cells,improving carrier management in top cells remains challenging due to the defective dual interfaces of wide-bandgap perovskite,particularly on textured silicon surfaces.Herein,a series of halide ions(Cl^(-),Br^(-),I^(-))substituted piperazinium salts are designed and synthesized as post-treatment modifiers for perovskite surfaces.Notably,piperazinium chloride induces an asymmetric bidirectional ions distribution from the top to the bottom surface,with large piperazinium cations concentrating at the perovskite surface and small chloride anions migrating downward to accumulate at the buried interface.This results in effective dual-interface defect passivation and energy band modulation,enabling wide-bandgap(1.68 eV)perovskite solar cells to achieve a PCE of 22.3%and a record product of open-circuit voltage×fill factor(84.4%relative to the Shockley-Queisser limit).Furthermore,the device retains 91.3%of its initial efficiency after 1200 h of maximum power point tracking without encapsulation.When integrated with double-textured silicon heterojunction solar cells,a remarkable PCE of 31.5%is achieved for a 1.04 cm^(2) monolithic perovskite/silicon tandem solar cell,exhibiting excellent long-term operational stability(T_(80)=755 h)without encapsulation in ambient air.This work provides a convenient strategy on dual-interface engineering for making high-efficiency and stable perovskite platforms.展开更多
Rational design of hierarchical structures and a dual-interface built-in electric field(BIEF)are vital for enhancing dielectric loss and directional charge transport in microwave absorption materials(MAMs).Herein,we p...Rational design of hierarchical structures and a dual-interface built-in electric field(BIEF)are vital for enhancing dielectric loss and directional charge transport in microwave absorption materials(MAMs).Herein,we propose a dual-interface BIEF engineering strategy to construct a multifunctional MoS_(2)@C/CoS_(x)composites.Inspired by the spiderweb hunting mechanism,magnetic Co-based Prussian blue(PB)is electro spun with polyacrylonitrile to form Co@CoO/C nanofibers,followed by sulfidation to induce ordered array architectures.The structural evolution enables the formation of heterogeneous MoS_(2)-CoSx-C interfaces and modulates the interfacial electric field intensity to enhance dielectric polarization.Density functional theory(DFT)calculations confirm that the work function difference(ΔΦ)of C/CoS_(2)/MoS_(2) is 6.179 eV,which indicates that the differencesΔΦamong MoS_(2),CoS_(x)and C components drive the spontaneous formation of dual-interface BIEF.This facilitates directional charge migration and strong dipolar/interface polarization,significantly improving the microwave attenuation capability.Benefiting from this design,the composite achieves a minimum reflection loss(RL_(min))of-63.83 dB and a maximum effective absorption bandwidth(EAB_(max))of 6.96 GHz,covering both C and Ku bands.In addition,the material reveals excellent infrared stealth performance due to its unique spiderweb-inspired ordered array structure.This study provides new insights into interfacial electric field modulation and a generalizable approach for designing multi-band and tunable microwave absorbers with synergistic electromagnetic and thermal stealth functions.展开更多
Solid electrolytes with desirable properties such as high ionic conductivity,wide electrochemical stable window,and suitable mechanical strength,and stable electrode-electrolyte interfaces on both cathode and anode si...Solid electrolytes with desirable properties such as high ionic conductivity,wide electrochemical stable window,and suitable mechanical strength,and stable electrode-electrolyte interfaces on both cathode and anode side are essential for high-voltage all-solid-state lithium batteries(ASSLBs)to achieve excellent cycle stability.In this work,a novel strategy of using LiF and LiNO_(3) as synergistic additives to boost the performance of PEO-PVDF/LLZTO-based composite solid electrolytes(CSEs)is developed,which also promotes the assembled high-voltage ASSLBs with dual-interfaces stability characteristic.Specifically,LiF as an inactive additive can increase the electrochemical stability of the CSE under high cut-off voltage,and improve the high-voltage compatibility between cathode and CSE,thus leading to a stable cathode/CSE interface.LiNO_(3) as an active additive can lead to an enhanced ionic conductivity of CSE due to the increased free-mobile Li+and ensure a stable CSE/Li interface by forming stable solid electrolyte interphase(SEI)on Li anode surface.Benefiting from the improved performance of CSE and stable dualinterfaces,the assembled NCM622/9[PEO_(15)-LiTFSI]-PVDF-15 LLZTO-2 LiF-3 LiNO_(3)/Li cell delivers a high rate capacity of 102.1 mAh g^(-1) at 1.0 C and a high capacity retention of 77.4%after 200 cycles at 0.5 C,which are much higher than those of the ASSLB assembled with additive-free CSE,with only 60.0 mAh g^(-1) and 52.0%,respectively.Furthermore,novel cycle test modes of resting for 5 h at different charge states after every 5 cycles are designed to investigate the high-voltage compatibility between cathode and CSE,and the results suggest that LiF additive can actually improve the high-voltage compatibility of cathode and CSE.All the obtained results confirm that the strategy of using synergistic additives in CSE is an effective way to achieve high-voltage ASSLBs with dual-interfaces stability.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.62204245,U23A200098)Baima Lake Laboratory Joint Funds of the Zhejiang Provincial Natural Science Foundation of China(Grant No.LBMHD24E020002)+4 种基金Key Research and Development Program of Zhejiang Province(Grant No.2022C01215,2024C01092)China Postdoctoral Science Foundation(Grant No.2023M743620,2024T170960)Key Research and Development Program of Ningbo(Grant No.2023Z151)National Key Research and Development Program of China(Grant No.2024YFB3817304)Zhejiang Provincial Natural Science Foundation of China(Grant No.LY24F040003).
文摘Despite significant advancements in the power conversion efficiency(PCE)of perovskite/silicon tandem solar cells,improving carrier management in top cells remains challenging due to the defective dual interfaces of wide-bandgap perovskite,particularly on textured silicon surfaces.Herein,a series of halide ions(Cl^(-),Br^(-),I^(-))substituted piperazinium salts are designed and synthesized as post-treatment modifiers for perovskite surfaces.Notably,piperazinium chloride induces an asymmetric bidirectional ions distribution from the top to the bottom surface,with large piperazinium cations concentrating at the perovskite surface and small chloride anions migrating downward to accumulate at the buried interface.This results in effective dual-interface defect passivation and energy band modulation,enabling wide-bandgap(1.68 eV)perovskite solar cells to achieve a PCE of 22.3%and a record product of open-circuit voltage×fill factor(84.4%relative to the Shockley-Queisser limit).Furthermore,the device retains 91.3%of its initial efficiency after 1200 h of maximum power point tracking without encapsulation.When integrated with double-textured silicon heterojunction solar cells,a remarkable PCE of 31.5%is achieved for a 1.04 cm^(2) monolithic perovskite/silicon tandem solar cell,exhibiting excellent long-term operational stability(T_(80)=755 h)without encapsulation in ambient air.This work provides a convenient strategy on dual-interface engineering for making high-efficiency and stable perovskite platforms.
基金supported by the National Natural Science Foundation of China(No.52462026)Postdoctoral Research Foundation of China(No.2018M643699)Shaanxi Province Postdoctoral Science Foundation(No.2018BSHEDZZ 101).
文摘Rational design of hierarchical structures and a dual-interface built-in electric field(BIEF)are vital for enhancing dielectric loss and directional charge transport in microwave absorption materials(MAMs).Herein,we propose a dual-interface BIEF engineering strategy to construct a multifunctional MoS_(2)@C/CoS_(x)composites.Inspired by the spiderweb hunting mechanism,magnetic Co-based Prussian blue(PB)is electro spun with polyacrylonitrile to form Co@CoO/C nanofibers,followed by sulfidation to induce ordered array architectures.The structural evolution enables the formation of heterogeneous MoS_(2)-CoSx-C interfaces and modulates the interfacial electric field intensity to enhance dielectric polarization.Density functional theory(DFT)calculations confirm that the work function difference(ΔΦ)of C/CoS_(2)/MoS_(2) is 6.179 eV,which indicates that the differencesΔΦamong MoS_(2),CoS_(x)and C components drive the spontaneous formation of dual-interface BIEF.This facilitates directional charge migration and strong dipolar/interface polarization,significantly improving the microwave attenuation capability.Benefiting from this design,the composite achieves a minimum reflection loss(RL_(min))of-63.83 dB and a maximum effective absorption bandwidth(EAB_(max))of 6.96 GHz,covering both C and Ku bands.In addition,the material reveals excellent infrared stealth performance due to its unique spiderweb-inspired ordered array structure.This study provides new insights into interfacial electric field modulation and a generalizable approach for designing multi-band and tunable microwave absorbers with synergistic electromagnetic and thermal stealth functions.
基金supported by the National Natural Science Foundation of China(Grant No.21875071)the Guangzhou Scientific and Technological Planning Project(Grant No.201704030061)the Guangdong Key R&D Program of China(Grant No.2019B090908001)。
文摘Solid electrolytes with desirable properties such as high ionic conductivity,wide electrochemical stable window,and suitable mechanical strength,and stable electrode-electrolyte interfaces on both cathode and anode side are essential for high-voltage all-solid-state lithium batteries(ASSLBs)to achieve excellent cycle stability.In this work,a novel strategy of using LiF and LiNO_(3) as synergistic additives to boost the performance of PEO-PVDF/LLZTO-based composite solid electrolytes(CSEs)is developed,which also promotes the assembled high-voltage ASSLBs with dual-interfaces stability characteristic.Specifically,LiF as an inactive additive can increase the electrochemical stability of the CSE under high cut-off voltage,and improve the high-voltage compatibility between cathode and CSE,thus leading to a stable cathode/CSE interface.LiNO_(3) as an active additive can lead to an enhanced ionic conductivity of CSE due to the increased free-mobile Li+and ensure a stable CSE/Li interface by forming stable solid electrolyte interphase(SEI)on Li anode surface.Benefiting from the improved performance of CSE and stable dualinterfaces,the assembled NCM622/9[PEO_(15)-LiTFSI]-PVDF-15 LLZTO-2 LiF-3 LiNO_(3)/Li cell delivers a high rate capacity of 102.1 mAh g^(-1) at 1.0 C and a high capacity retention of 77.4%after 200 cycles at 0.5 C,which are much higher than those of the ASSLB assembled with additive-free CSE,with only 60.0 mAh g^(-1) and 52.0%,respectively.Furthermore,novel cycle test modes of resting for 5 h at different charge states after every 5 cycles are designed to investigate the high-voltage compatibility between cathode and CSE,and the results suggest that LiF additive can actually improve the high-voltage compatibility of cathode and CSE.All the obtained results confirm that the strategy of using synergistic additives in CSE is an effective way to achieve high-voltage ASSLBs with dual-interfaces stability.
