Dichloro[1,2-bis(diphenylphosphino)ethane]nickel^(2+(NiCl2(dppe))is an organic compound containing C_(26)H_(24)P_(2)(dppe)molecules and Cl^(-),Ni^(2+ions.The large-size NiCl_(2)(dppe)single crystals with longest dimen...Dichloro[1,2-bis(diphenylphosphino)ethane]nickel^(2+(NiCl2(dppe))is an organic compound containing C_(26)H_(24)P_(2)(dppe)molecules and Cl^(-),Ni^(2+ions.The large-size NiCl_(2)(dppe)single crystals with longest dimension of 4 mm were grown by the method of slow evaporation of organic solution.Single crystal x-ray diffraction spectrum indicates that the single crystal is of high quality.Magnetization results of the NiCl_(2)(dppe)single crystals show an anisotropic paramagnetism behavior and diamagnetic background,which come from Ni^(2+ions and benzene ring,respectively.However,according to the specific heat results with temperature down to 0.1 K and magnetic field up to 14 T,no expected field-induced quantum phase transition was observed in NiCl_(2)(dppe)single crystals.展开更多
Slot-die coating with halogen-free solvents is a promising scalable fabrication strategy for organic solar cells(OSCs).However,the complex interplay between long-time-scale solute diffusion and microstructural evoluti...Slot-die coating with halogen-free solvents is a promising scalable fabrication strategy for organic solar cells(OSCs).However,the complex interplay between long-time-scale solute diffusion and microstructural evolution during the coating process remains poorly understood,limiting further optimization of morphology and device performance.In this study,we elucidate the critical role of solution viscosity in regulating phase separation and aggregation kinetics.Specifically,lower solution viscosity enhances solute diffusion,accelerating molecular aggregation while suppressing liquid-liquid phase separation(LLPS).Notably,we observe that in three different systems with varying crystallinity and immiscibility(PM6:Y6,PTQ10:Y6,and D18:Y6),the optimal processing conditions for peak device efficiency consistently correspond to a nearly identical solution viscosity(∼0.8 mPa s),despite variations in optimal processing temperatures.In situ characterizations reveal that at this viscosity,all three systems exhibit constrained LLPS and rapid molecular aggregation,promoting the formation of finely structured,continuous nanoscale domains.These findings establish solution viscosity as a universal governing parameter for morphology control in printed active layers.By providing a fundamental framework for understanding viscosity-mediated phase separation,this work offers valuable insights for advancing high-throughput,environmentally friendly printing techniques for high-efficiency OSCs.展开更多
基金Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0403502)the National Natural Science Foundation of China+1 种基金Youth Innovation Promotion Association of Chinese Academy of Sciences (Grant No. 2017483)supported by the High Magnetic Field Laboratory of Anhui Province,China
文摘Dichloro[1,2-bis(diphenylphosphino)ethane]nickel^(2+(NiCl2(dppe))is an organic compound containing C_(26)H_(24)P_(2)(dppe)molecules and Cl^(-),Ni^(2+ions.The large-size NiCl_(2)(dppe)single crystals with longest dimension of 4 mm were grown by the method of slow evaporation of organic solution.Single crystal x-ray diffraction spectrum indicates that the single crystal is of high quality.Magnetization results of the NiCl_(2)(dppe)single crystals show an anisotropic paramagnetism behavior and diamagnetic background,which come from Ni^(2+ions and benzene ring,respectively.However,according to the specific heat results with temperature down to 0.1 K and magnetic field up to 14 T,no expected field-induced quantum phase transition was observed in NiCl_(2)(dppe)single crystals.
基金the National Natural Science Foundation of China(W2411049,52303247,and 52173023)the Fundamental Research Funds for the Central Universities(xzy012023169)+2 种基金the Postdoctoral Research Project of Shaanxi Province(2023BSHEDZZ24)the 111 Project 2.0(BP0618008)the China Postdoctoral Science Foundation(2023TQ0273)。
文摘Slot-die coating with halogen-free solvents is a promising scalable fabrication strategy for organic solar cells(OSCs).However,the complex interplay between long-time-scale solute diffusion and microstructural evolution during the coating process remains poorly understood,limiting further optimization of morphology and device performance.In this study,we elucidate the critical role of solution viscosity in regulating phase separation and aggregation kinetics.Specifically,lower solution viscosity enhances solute diffusion,accelerating molecular aggregation while suppressing liquid-liquid phase separation(LLPS).Notably,we observe that in three different systems with varying crystallinity and immiscibility(PM6:Y6,PTQ10:Y6,and D18:Y6),the optimal processing conditions for peak device efficiency consistently correspond to a nearly identical solution viscosity(∼0.8 mPa s),despite variations in optimal processing temperatures.In situ characterizations reveal that at this viscosity,all three systems exhibit constrained LLPS and rapid molecular aggregation,promoting the formation of finely structured,continuous nanoscale domains.These findings establish solution viscosity as a universal governing parameter for morphology control in printed active layers.By providing a fundamental framework for understanding viscosity-mediated phase separation,this work offers valuable insights for advancing high-throughput,environmentally friendly printing techniques for high-efficiency OSCs.
