Because of their better chemical stability and fascinating anisotropic characteristics,Dion-Jacobson(DJ)-layered halide perovskites,which owe crystallographic two-dimensional structures,have fascinated growing attenti...Because of their better chemical stability and fascinating anisotropic characteristics,Dion-Jacobson(DJ)-layered halide perovskites,which owe crystallographic two-dimensional structures,have fascinated growing attention for solar devices.DJ-layered halide perovskites have special structural and photoelectronic features that allow the van der Waals gap to be eliminated or reduced.DJ-layered halide perovskites have improved photophysical characteristics,resulting in improved photovoltaic performance.Nevertheless,owing to the nature of the solution procedure and the fast crystal development of DJ perovskite thin layers,the precursor compositions and processing circumstances can cause a variety of defects to occur.The application of additives can impact DJ perovskite crystallization and film generation,trap passivation in the bulk and/or at the surface,interface structure,and energetic tuning.This study discusses recent developments in additive engineering for DJ multilayer halide perovskite film production.Several additive-assisted bulk and interface optimization methodologies are summarized.Lastly,an overview of research developments in additive engineering in the production of DJ-layered halide perovskite solar cells is offered.展开更多
Dion-Jacobson phase two-dimensional(DJ 2D)perovskites,recently attracting considerable interests,exhibit excellent environmental stability and structural tunability,but their solar cells still offer unsatisfactory pow...Dion-Jacobson phase two-dimensional(DJ 2D)perovskites,recently attracting considerable interests,exhibit excellent environmental stability and structural tunability,but their solar cells still offer unsatisfactory power conversion efficiencies(PCEs).Herein,we develop DJ 2D perovskites employing formamidinium(FA+)as a ternary cation in the perovskite cages((PDA)(FA)x(MA)3-xPb4 I13,χ=0,0.15,0.3 and 0.6,PDA=1,3-propanediammonium)for highly efficient and stable perovskite solar cells(PSCs).We found that the DJ 2D perovskite with a 10%FA+fraction presents improved crystallinity,preferred vertical orientation,and longer charge carrier lifetime compared to that without FA+doping.As a result,the FAdoped DJ 2D PSCs exhibit a champion PCE of 14.74%with superior device stability.The unencapsulated devices sustain over 92%of its initial PCE after storage at a constant relative humidity(RH)of 65%for 6000 h,90%by heat at 85℃in air for 800 h,and 94%under 1-sun illumination for 5000 h.These findings demonstrate that the incorporation of FA cation into the DJ 2D perovskite is a promising strategy to develop highly efficient and stable DJ 2D PSCs.展开更多
A two-dimensional(2D)organic-inorganic hybrid perovskite(OIHP)material is considered as a promising candidate for a long-term stable photodetector owing to its outstanding phase and environmental stability.Herein,we d...A two-dimensional(2D)organic-inorganic hybrid perovskite(OIHP)material is considered as a promising candidate for a long-term stable photodetector owing to its outstanding phase and environmental stability.Herein,we demonstrate a perovskite photodiode based on the DJ phase 2D perovskite(PDA)(MA)_(n-1)Pb_(n)I_(3n+1)(where PDA is 1,3-propylenediamine,MA is methylamine,nominal n=4).The best-performance device exhibits a high detectivity of 4.57×10^(11) Jones,a responsivity of 0.25 A·W^(-1) at 480 nm,a low dark current density of 9.60×10^(-4) mA cm^(-2),and a remarkable on/off ratio of 3.10×10^(5).The unencapsulated device can maintain 95%of the initial photocurrent density after 90 days under an ambient atmosphere with relative humidity(RH)of 65%,demonstrating its improved stability than the 3D counterpart.The excellent stability of the photodiode based on 2D perovskite promises its bright commercial application ftiture.展开更多
Two-dimensional Dion–Jacobson(D-J)phase perovskites are prospective photovoltaic and optoelectronic materials.To study their mechanical properties and carrier-lattice interactions,we conduct femtosecond spectroscopic...Two-dimensional Dion–Jacobson(D-J)phase perovskites are prospective photovoltaic and optoelectronic materials.To study their mechanical properties and carrier-lattice interactions,we conduct femtosecond spectroscopic experiments on the films of a D-J perovskite.After optical excitation,a∼33 meV bandgap oscillation is observed in the film by transient absorption spectroscopy.With the help of transient reflection methods,we reveal that the oscillation originates from the transport of coherent longitudinal acoustic phonons through the film.Large bandgap oscillation indicates a strong coupling between carriers and lattice,and significant bandgap modulation by strains in D-J perovskites.展开更多
基金Min Liu thanks the CSC for funding his PhD scholarship(grant number 202008120110)The ANR agency is acknowledged for financial support via the ChemSta project ANR-21-CE05-0022.
文摘Because of their better chemical stability and fascinating anisotropic characteristics,Dion-Jacobson(DJ)-layered halide perovskites,which owe crystallographic two-dimensional structures,have fascinated growing attention for solar devices.DJ-layered halide perovskites have special structural and photoelectronic features that allow the van der Waals gap to be eliminated or reduced.DJ-layered halide perovskites have improved photophysical characteristics,resulting in improved photovoltaic performance.Nevertheless,owing to the nature of the solution procedure and the fast crystal development of DJ perovskite thin layers,the precursor compositions and processing circumstances can cause a variety of defects to occur.The application of additives can impact DJ perovskite crystallization and film generation,trap passivation in the bulk and/or at the surface,interface structure,and energetic tuning.This study discusses recent developments in additive engineering for DJ multilayer halide perovskite film production.Several additive-assisted bulk and interface optimization methodologies are summarized.Lastly,an overview of research developments in additive engineering in the production of DJ-layered halide perovskite solar cells is offered.
基金supported by the National Natural Science Foundation of China(No.51973223)the DICP&QIBEBT UN201705+1 种基金the Liaoning Revitalization Talents Program(XLYC1807231)the DICP(Grant No.DICP I202011)。
文摘Dion-Jacobson phase two-dimensional(DJ 2D)perovskites,recently attracting considerable interests,exhibit excellent environmental stability and structural tunability,but their solar cells still offer unsatisfactory power conversion efficiencies(PCEs).Herein,we develop DJ 2D perovskites employing formamidinium(FA+)as a ternary cation in the perovskite cages((PDA)(FA)x(MA)3-xPb4 I13,χ=0,0.15,0.3 and 0.6,PDA=1,3-propanediammonium)for highly efficient and stable perovskite solar cells(PSCs).We found that the DJ 2D perovskite with a 10%FA+fraction presents improved crystallinity,preferred vertical orientation,and longer charge carrier lifetime compared to that without FA+doping.As a result,the FAdoped DJ 2D PSCs exhibit a champion PCE of 14.74%with superior device stability.The unencapsulated devices sustain over 92%of its initial PCE after storage at a constant relative humidity(RH)of 65%for 6000 h,90%by heat at 85℃in air for 800 h,and 94%under 1-sun illumination for 5000 h.These findings demonstrate that the incorporation of FA cation into the DJ 2D perovskite is a promising strategy to develop highly efficient and stable DJ 2D PSCs.
基金Supported by the National Natural Science Foundation of China(No.U1605241)the Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(No.2021ZR116)the Natural Science Foundation of Fujian Province for Distinguished Young Scholars(No.2019J06023)。
文摘A two-dimensional(2D)organic-inorganic hybrid perovskite(OIHP)material is considered as a promising candidate for a long-term stable photodetector owing to its outstanding phase and environmental stability.Herein,we demonstrate a perovskite photodiode based on the DJ phase 2D perovskite(PDA)(MA)_(n-1)Pb_(n)I_(3n+1)(where PDA is 1,3-propylenediamine,MA is methylamine,nominal n=4).The best-performance device exhibits a high detectivity of 4.57×10^(11) Jones,a responsivity of 0.25 A·W^(-1) at 480 nm,a low dark current density of 9.60×10^(-4) mA cm^(-2),and a remarkable on/off ratio of 3.10×10^(5).The unencapsulated device can maintain 95%of the initial photocurrent density after 90 days under an ambient atmosphere with relative humidity(RH)of 65%,demonstrating its improved stability than the 3D counterpart.The excellent stability of the photodiode based on 2D perovskite promises its bright commercial application ftiture.
基金supported by the Ministry of Science and Technology(No.2018YFA0208704)the National Natural Science Foundation of China(No.22173096).
文摘Two-dimensional Dion–Jacobson(D-J)phase perovskites are prospective photovoltaic and optoelectronic materials.To study their mechanical properties and carrier-lattice interactions,we conduct femtosecond spectroscopic experiments on the films of a D-J perovskite.After optical excitation,a∼33 meV bandgap oscillation is observed in the film by transient absorption spectroscopy.With the help of transient reflection methods,we reveal that the oscillation originates from the transport of coherent longitudinal acoustic phonons through the film.Large bandgap oscillation indicates a strong coupling between carriers and lattice,and significant bandgap modulation by strains in D-J perovskites.
基金supported by the National Natural Science Foundation of China(52073131,51902148,and 12047501)the Fundamental Research Funds for the Central Universities(lzujbky-2021-it31,lzujbky-2021-59,lzujbky-2021-ct15,lzujbky2021-ct01,and lzujbky-2021-sp69)supported by Supercomputing Center of Lanzhou University。