Home > News > Small: in situ growth of perovskite nanocrystals on thin transition metal carbide mxene nanosheets for efficient energy transfer

Small: in situ growth of perovskite nanocrystals on thin transition metal carbide mxene nanosheets for efficient energy transfer

wallpapers News 2020-08-10
In recent years

perovskite nanocrystals of metal halides have attracted extensive attention. Perovskite nanocrystals are easily synthesized at room temperature with high yield. In addition perovskite nanocrystals have many advantages such as high fluorescence quantum efficiency narrow b gap emission tunable emission wavelength in the whole visible region excellent visible light response high specific surface area. Due to these excellent properties perovskite nanocrystals have broad application prospects in optoelectronic devices photocatalysis. Due to the existence of a large number of grain boundaries in nanocrystalline films which greatly limits the charge energy transfer it is necessary to improve the charge or energy transfer characteristics of nanocrystalline interfaces for applications such as photoelectric conversion photocatalysis. Heterojunction based on perovskite nanocrystals two-dimensional materials is a common method to improve the charge energy transfer at the perovskite interface. This method can greatly improve the performance of perovskite nanocrystals in optoelectronic devices photocatalysis. However it is difficult to synthesize such heterojunctions due to the polarity difference between perovskite quantum dots two-dimensional materials. There are two kinds of photogenerated carrier transport mechanisms in

namely charge transfer energy transfer. The energy of the excited state or the charge with the excited energy can pass through the heterojunction interface resulting in unique physical properties. Energy transfer is the dominant factor determining the relaxation dynamics of heterojunction in laser photoluminescence applications charge transfer plays an important role in photoelectric devices such as photoelectric detection. Therefore it is of great significance to explore the mechanism of photo generated carrier transport in heterojunction for the practical application of this kind of heterojunction.

in collaboration with researchers from Macau University Shenzhen University Guangdong University of technology organic-inorganic hybrid perovskite nanocrystals (mapbbr3) were uniformly deposited on high conductivity transition metal carbide mxene (ti3c2tx) nanosheets by solution growth method. The results show that the key to realize the in-situ growth of such heterojunction is to optimize the ratio of mixed solvents. The composite has both the strong visible light absorption properties of perovskite materials the superior conductivity of two-dimensional materials. Steady state fluorescence spectra time-resolved fluorescence spectra show that the fluorescence of mapbbr3 / ti3c2tx heterojunction is quenched its fluorescence lifetime is shortened which indicates that there is charge or energy transfer at the heterojunction interface. In order to explore whether the mechanism of photo generated carrier transport at the interface of heterojunction is one or both of charge transfer energy transfer the research team prepared photo electric converters with mapbbr3 / ti3c2tx heterojunction pure ti3c2tx nanosheets as active materials respectively. The results show that both single electron single hole devices with mapbbr3 / ti3c2tx heterostructure as active material have obvious photoelectric response while the photoelectric converter with pure ti3c2tx nanosheets as active material has no photoelectric response. At the same time the single electron device with mapbbr3 / ti3c2tx heterojunction as active material has higher switching ratio than single hole device. In addition the team combined steady-state transient absorption spectra b arrangement of heterojunction found that there were both energy transfer charge transfer at the interface of mapbbr3 / ti3c2tx heterojunction the charge transfer was mainly electron transfer.

this study provides useful guidance for the synthesis preparation of halide perovskite / two-dimensional material heterojunction explores the photogenerated carrier dynamics process at the interface of mapbbr3 / ti3c2tx heterojunction in detail which is expected to promote the large-scale application of such heterojunction in the fields of photoelectron photocatalysis.

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