A solvent-assisted methodology has been developed to synthesize CH_3NH_3 PbI_3perovskite absorber layers.It involved the use of a mixed solvent of CH_3NH_3 I,PbI_2,c-butyrolactone,and dimethyl sulfoxide(DMSO) followed...A solvent-assisted methodology has been developed to synthesize CH_3NH_3 PbI_3perovskite absorber layers.It involved the use of a mixed solvent of CH_3NH_3 I,PbI_2,c-butyrolactone,and dimethyl sulfoxide(DMSO) followed by the addition of chlorobenzene(CB).The method produced ultra-flat and dense perovskite capping layers atop mesoporous TiO_2 films,enabling a remarkable improvement in the performance of free hole transport material(HTM) carbon electrode-based perovskite solar cells(PSCs).Toluene(TO) was also studied as an additional solvent for comparison.At the annealing temperature of 100 °C,the fabricated HTM-free PSCs based on drop-casting CB demonstrated power conversion efficiency(PCE) of 9.73 %,which is 36 and 71 % higher than those fabricated from the perovskite films using TO or without adding an extra solvent,respectively.The interaction between the PbI_2–DMSO–CH_3NH_3I intermediate phase and the additional solvent was discussed.Furthermore,the influence of the annealing temperature on the absorber film formation,morphology,and crystalline structure was investigated and correlated with the photovoltaic performance.Highly efficient,simple,and stable HTM-free solar cells with a PCE of 11.44 % were prepared utilizing the optimum perovskite absorbers annealed at 120 °C.展开更多
In recent two years,organometal halide perovskites quantum dots are emerging as a new member of the nanocrystals family.From the chemical point of view,these perovskites quantum dots can be synthesized either by class...In recent two years,organometal halide perovskites quantum dots are emerging as a new member of the nanocrystals family.From the chemical point of view,these perovskites quantum dots can be synthesized either by classical hot-injection technique for inorganic semiconductor quantum dots or the reprecipitation synthesis at room temperature for organic nanocrystals.From a physical point of view,the observed large exciton binding energy,well self-passivated surface,as well as the enhanced nonlinear properties have been of great interest for fundamental study.From the application point of view,these perovskites quantum dots exhibit high photoluminescence quantum yields,wide wavelength tunability and ultra-narrow band emissions,the combination of these superior optical properties and low cost fabrication makes them to be suitable candidates for display technology.In this short review,we introduce the synthesis,optical properties,the prototype light-emitting devices,and the current important research tasks of halide perovsktie quantum dots,with an emphasis on CH_3NH_3PbX_3（X= CI,Br,I） quantum dots that developed in our group.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11274119,61275038)
文摘A solvent-assisted methodology has been developed to synthesize CH_3NH_3 PbI_3perovskite absorber layers.It involved the use of a mixed solvent of CH_3NH_3 I,PbI_2,c-butyrolactone,and dimethyl sulfoxide(DMSO) followed by the addition of chlorobenzene(CB).The method produced ultra-flat and dense perovskite capping layers atop mesoporous TiO_2 films,enabling a remarkable improvement in the performance of free hole transport material(HTM) carbon electrode-based perovskite solar cells(PSCs).Toluene(TO) was also studied as an additional solvent for comparison.At the annealing temperature of 100 °C,the fabricated HTM-free PSCs based on drop-casting CB demonstrated power conversion efficiency(PCE) of 9.73 %,which is 36 and 71 % higher than those fabricated from the perovskite films using TO or without adding an extra solvent,respectively.The interaction between the PbI_2–DMSO–CH_3NH_3I intermediate phase and the additional solvent was discussed.Furthermore,the influence of the annealing temperature on the absorber film formation,morphology,and crystalline structure was investigated and correlated with the photovoltaic performance.Highly efficient,simple,and stable HTM-free solar cells with a PCE of 11.44 % were prepared utilizing the optimum perovskite absorbers annealed at 120 °C.
基金supported by the Major State Basic Research Development Program of China(973 Program,No.2013CB328804)National Natural Science Foundation of China(No.21573018)Beijing Nova Program(No.xx2014B040)
文摘In recent two years,organometal halide perovskites quantum dots are emerging as a new member of the nanocrystals family.From the chemical point of view,these perovskites quantum dots can be synthesized either by classical hot-injection technique for inorganic semiconductor quantum dots or the reprecipitation synthesis at room temperature for organic nanocrystals.From a physical point of view,the observed large exciton binding energy,well self-passivated surface,as well as the enhanced nonlinear properties have been of great interest for fundamental study.From the application point of view,these perovskites quantum dots exhibit high photoluminescence quantum yields,wide wavelength tunability and ultra-narrow band emissions,the combination of these superior optical properties and low cost fabrication makes them to be suitable candidates for display technology.In this short review,we introduce the synthesis,optical properties,the prototype light-emitting devices,and the current important research tasks of halide perovsktie quantum dots,with an emphasis on CH_3NH_3PbX_3（X= CI,Br,I） quantum dots that developed in our group.
