| Photodetectors are widely used in imaging,environmental and health monitoring and optical communication.Especially in the past two decades,with the rapid development of wearable artificial intelligence optoelectronic devices,flexible photodetectors as the key component of flexible optoelectronic system has attracted much attention.In the past decade,devices with excellent performances such as self-powered,ultra-fast optical response and broadband detection have been reported,which have laid an important foundation for practical application.Among them,the flexible photodetector based on TMDCs is particularly outstanding.These devices based on nanostructured TMDCs materials show remarkable performance and broad application prospects.However,there are some deficiencies which need to be improved.For example,two-dimensional nanomaterials with atomic thickness have a lower absorption rate of light.In addition,some devices that can enhance the light absorption of nanomaterials have been reported so far,which often have complex and delicate preparation process,resulting in low success rate and high cost.Moreover,most flexible photodetectors based on polymer substrates can only operate at comfortable room temperatures,but not at high temperatures.Once the environment temperature changes dramatically,the flexible photodetector will be damaged irretrievably because most polymer substrates are not able to withstand high temperature.In this paper,a typical TMDCs-MoS2 is used as the functional material to explore how to increase the light absorption of the flexible photodetector based on MoS2 and how to realize the flexible photodetector with excellent heat resistance.In the first work,we synthesized a flower-like MoS2 microsphere by a hydrothermal method.Considering that the structure of the flower-shaped microspheres causes multiple scattering of light,the absorption of light is enhanced.A flexible photodetector with high Responsivity and Detectivity is realized by attaching MoS2 uniformly and compactly to the membrane surface as a flexible substrate by vacuum filtration.In the second work,the Liquid phase ultrasonic exfoliated MoS2 nanosheets was adsorbed on the filter membrane by vacuum filtration,and then the filter membrane was immersed in deionized water.We found that the outermost nanosheets of the filter membrane would float to the water surface and spontaneously form a uniform and compact film.In addition,flexible muscovite substrates can withstand higher temperatures than commonly used polymer substrates.Moreover,the natural hydrophilicity and high surface of Muscovite substrate make it have a strong adsorption effect on nanomaterials.And the natural hydrophilicity and high surface energy of muscovite substrate give it a strong adsorption effect on nanomaterials.Inspired by this,we transfer the floating MoS2 nanosheets film onto the muscovite substrate,demonstrating a flexible photodetector with fast response speed,stable performance and the ability to withstand300℃without losing the optical response.We believe that the work in this paper has certain reference value for the development of flexible photodetectors. |
