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We present a novel flipping transfer method for van der Waalsheterostructures, offering a significant advancement over previous techniquesby eliminating the need for polymers and solvents. Here, we utilizecommercially available gel film and control its stickiness through oxygenplasma and UV-Ozone treatment, also effectively removing residues from the gelfilm surface. The cleanliness of the surface is verified through atomic forcemicroscopy. We investigate the quality of our fabricated devices usingmagnetotransport measurements on graphene/hBN and graphene/{\alpha}-RuCl3heterostructures. Remarkably,graphene/hBN devices produced with the flippingmethod display quality similar to that of fully encapsulated devices. This isevidenced by the presence of a symmetry-broken state at 1 T. Additionally,features of the Hofstadter butterfly were also observed in the second devices.In the case of graphene/{\alpha}-RuCl3, we observe quantum oscillations with abeating mode and two-channel conduction, consistent with fully encapsulateddevices.

Full-dry flipping transfer method for van der Waals heterostructure