As the field of metal halide perovskites matures,a range of compositionally different perovskite films has found a place in efficient optoelectronic devices.These films feature variable local structural stability,carr...As the field of metal halide perovskites matures,a range of compositionally different perovskite films has found a place in efficient optoelectronic devices.These films feature variable local structural stability,carrier diffusion,and recombination,while there is still a lack of easy-to-implement generic protocols for high-throughput characterization of these variable properties.Correlation clustering imaging(CLIM)is a recently developed tool that resolves peculiarities of local photophysics by assessing the dynamics of photoluminescence detected by wide-field optical microscopy.We demonstrate the capability of CLIM as a high-throughput characterization tool of perovskite films using MAPbI3(MAPI)and triple cation mixed halide(TCMH)perovskites as examples where it resolves the interplay of carrier diffusion,recombination,and defect dynamics.We found significant differences in the appearance of metastable defect states in these two films.Despite a better surface quality and larger grain size,MAPI films showed more pronounced effects of fluctuating defect states than did TCMH films.As CLIM shows a significant difference between materials known to lead to different solar cell efficiencies,it can be considered a tool for quality control of thin films for perovskite optoelectronic devices.展开更多
It has been a mystery that the detected fluorescence intensity of single MEH-PPV molecules is much lower than expected based on their chain length.In this review,after re-evaluating of the literature data in the light...It has been a mystery that the detected fluorescence intensity of single MEH-PPV molecules is much lower than expected based on their chain length.In this review,after re-evaluating of the literature data in the light of new specially designed experiments,we present a comprehensive explanation of this issue:The actual size of MEH-PPV molecules at single molecule level is much smaller than expected due to de-aggregation and chain scission,while static quenching("dark matter")also exists for large molecules,further reducing their brightness.展开更多
基金support of Marie Skłodowska-Curie postdoctoral fellowship(No.101151427,SPS_Nano)from the European Union’s Horizon Europe program,short stay abroad grant(K257023N)travel grant(K147824N)from Research Foundation-Flanders(FWO)。
文摘As the field of metal halide perovskites matures,a range of compositionally different perovskite films has found a place in efficient optoelectronic devices.These films feature variable local structural stability,carrier diffusion,and recombination,while there is still a lack of easy-to-implement generic protocols for high-throughput characterization of these variable properties.Correlation clustering imaging(CLIM)is a recently developed tool that resolves peculiarities of local photophysics by assessing the dynamics of photoluminescence detected by wide-field optical microscopy.We demonstrate the capability of CLIM as a high-throughput characterization tool of perovskite films using MAPbI3(MAPI)and triple cation mixed halide(TCMH)perovskites as examples where it resolves the interplay of carrier diffusion,recombination,and defect dynamics.We found significant differences in the appearance of metastable defect states in these two films.Despite a better surface quality and larger grain size,MAPI films showed more pronounced effects of fluctuating defect states than did TCMH films.As CLIM shows a significant difference between materials known to lead to different solar cell efficiencies,it can be considered a tool for quality control of thin films for perovskite optoelectronic devices.
基金supported by the National Natural Science Foun-dation of China(NSFC Nos.22073046 and 62011530133)the Fundamental Research Funds for the Central Universities(020514380256 and 020514380278)+1 种基金the State Key Laboratory of Analytical Chemistry for Life Science(SKLACL2217)The authors are also grateful to the STINT China-Sweden mobility program CH2019-8329 and the Swedish Research Council(2020-03530).
文摘It has been a mystery that the detected fluorescence intensity of single MEH-PPV molecules is much lower than expected based on their chain length.In this review,after re-evaluating of the literature data in the light of new specially designed experiments,we present a comprehensive explanation of this issue:The actual size of MEH-PPV molecules at single molecule level is much smaller than expected due to de-aggregation and chain scission,while static quenching("dark matter")also exists for large molecules,further reducing their brightness.
