| Tin disulfide?SnS2?,as an environmentally friendly metal sulfide semiconductor material,has been widely used in field effect transistors,photodetectors and photocatalysts because of its rich resources,low cost,excellent electrical,optical and magnetic properties.However,single-component SnS2 material is difficult to meet the requirements of various device fabrication and functional applications.Inorganic/polymer nanocomposites possess the advantages of inorganic nanomaterials and polymers,which exhibit the premium properties through the synergetic function between inorganic component and polymer component.In this paper,we prepared the composites based on SnS2 with different nanomorphologies and polymers,which have been used in photodetectors,photocatalysts and organic light-emitting diodes?OLEDs?.Moreover,their optoelectronic performances have been investigated through the corresponding characterization and measurements.The main research in this work is summarized as follows:1.SnS2 nanosheets were synthesized through a hydrothermal reaction,then the solution of SnS2 quantum dots?QDs?was achieved through freeze pretreatment and centrifugation methods.The film of SnS2 QDs/PTAA bulk heterojunction composite was fabricated by spin-coating method and applied to ultraviolet detectors.The results reveal that the ultraviolet detector based on SnS2 QDs/PTAA composite film exhibits excellent self-powered light response properties under 365 nm?2.5 mW/cm2?excitation.The optimal device shows a light response rate of 20.22mA/W,a light detection rate of 5.22×1014 Jones and a light on-off ratio of 104,respectively.Meanwhile,the rise time and fall time of the light response are both shorter than 200 ms.2.SnS2 nanosheets/PVP nanocomposites were synthesized through a hydrothermal reaction.Influences of different PVP additions on nanocomposites'morphologies and particle size were investigated.The photocatalytic degradation experiments of SnS2 nanosheets/PVP nanocomposites as photocatalysts were carried out with methylene blue as the target degradant.The results reveal that the nanocomposites exhibit the more effective photocatalytic degradation properties than that of the SnS2 nanosheets under simulated visible light irradiation.The optimized nanocomposite prepared with the PVP addition amount of 0.5 g shows the highest photodegradation performance of methylene blue,and the photodegradation rate of the composite is 2 times higher than that of the SnS2 nanosheet.3.SnS2 QDs/PEI composite film was prepared by spin-coating method and applied as an electron transport layer in OLED with the structure of ITO/PEDOT:PSS:AgNWs/PVK:Ir?ppy?3:PBD/PEI:SnS2 QDs/LiF/Al.By doping PEI,SnS2 QDs can be uniformly dispersed in solution,which will be beneficial for composite film-forming by spin-coating.As the electron transport layer,SnS2 QDs/PEI composite film can obviously enhance the electron injection and transport ability in OLED and balance the carriers'recombination,further to improve the luminance and efficiency of the device.The highest brightness of 29335 cd/m2 and maximum current efficiency of 9.9 cd/A have been achieved for the optimized OLED with a low turn-on voltage of 2.9 V. |
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