Transfer Of Two Dimensional Materials And Its Application In Fet Devices

As the size of transistors continues to decrease,the computing speed and integration of electronic chips are continually evolving.Two-dimensional materials represented by graphene and MoS₂ have been widely used in optoelectronics and nanoelectronics due to their excellent optical and electrical properties.In the future design and application of microelectronic devices,two-dimensional semiconductor devices will occupy a very important position.On the other hand,in the process of preparation and assembly of two-dimensional devices,efficient and non-destructive transfer of two-dimensional materials is a critical link;and,successful implementation of large-area transfer of two-dimensional materials,to promote the scale of two-dimensional devices industrial production is of great significance.This paper proposes an efficient and environmentally friendly method for large-area transfer of two-dimensional materials.The caramelization reaction of sucrose at a high temperature is utilized,and the solidified caramel is used as a medium to complete the transfer of the two-dimensional material.The transfer of mechanically exfoliated graphene,CVD grown graphene films,and CVD-grown MoS₂ was successfully accomplished using this method.The two-dimensional materials after transfer were characterized.The images of the optical microscope showed that the two-dimensional material after transfer was intact.The AFM and TEM images showed that the surface of the transferred two-dimensional material was flat and clean;the Raman and PL spectra indicated the transfer process no other impurities and defects were introduced.The transfer of two-dimensional materials to the flexible substrate can be realized by using sugar transfer,and the problem that the organic solvent such as acetone used in the transfer process dissolves or swells the flexible substrate can be avoided,and the graphene is successfully transferred to the PDMS substrate and the PET substrate,and MoS₂ is transferred to the PET substrate.At the same time,the pattern transfer and secondary transfer of two-dimensional materials can be realized,further expanding the diversity and flexibility of electronic devices design.The transferred two-dimensional materials were assembled into FET devices and analyzed for electrical transport properties.For the graphene FET device after mechanical transfer after transfer,the transfer characteristic curve obtained by the test conforms to the energy band structure characteristics of graphene,and the calculated mobility is?=13214 cm²/V s;for the transferred CVD molybdenum disulfide FET device,the transfer characteristics obtained by the test The curve shows that the switching ratio is 10³ and the calculated mobility is?=0.08 cm²/V s.The effect of caramel on the performance of molybdenum disulfide FET devices was analyzed by comparative experiments,and the reasons were analyzed.