We demonstrate the dry release transfer of single-layer and bi-layer graphene and few-layer h-BN by utilizing poly(propylene) carbonate (PPC) films. Because of the strong adhesion between PPC and 2D materials around room temperature, we demonstrate that single-layer to few-layer graphene, as well as few-layer h-BN can be fabricated on a spin-coated PPC film/SiO₂/Si substrate via the mechanical exfoliation method. In addition, we show that these single-layer to few-layer crystals are clearly distinguishable using an optical microscope with the help of optical interference. Because of the thermoplastic properties of PPC film, the adhesion between the 2D materials and PPC significantly decreases at about 70 °C. Therefore, by tuning the temperature, the graphene and h-BN flakes on PPC can be easily dry-transferred onto another h-BN substrate. We demonstrate the fabrication of encapsulated h-BN/graphene/h-BN devices and graphene/few-layer h-BN/graphene vertical-tunnel-junction devices using this method. Our finding provides a simple method for constructing high-quality graphene and h-BN-based van der Waals heterostructures with a minimum amount of polymer contamination.

我们通过利用聚碳酸亚丙酯（PPC）膜证明了单层和双层石墨烯以及几层h-BN的干释放转移。由于室温下PPC和2D材料之间的强粘合性，我们证明了可以在旋涂PPC膜/ SiO ₂上制造单层至几层石墨烯以及几层h-BN。/ Si基板通过机械剥离法。此外，我们表明，借助光学显微镜在光学干涉的帮助下，这些单层至几层晶体可以清晰地区分。由于PPC膜具有热塑性，因此2D材料和PPC之间的粘合力在大约70°C时会显着降低。因此，通过调节温度，可以轻松地将PPC上的石墨烯和h-BN薄片干式转移到另一个h-BN基板上。我们演示了使用此方法制作的封装h-BN /石墨烯/ h-BN器件和石墨烯/少量层h-BN /石墨烯垂直隧道结器件的制造方法。我们的发现为构建高质量的石墨烯和基于h-BN的范德华异质结构提供了一种简单的方法，并减少了聚合物的污染。