Versatile construction of van der Waals heterostructures using a dual-function polymeric film

Zhujun Huang; Abdullah Alharbi; William Mayer; Edoardo Cuniberto; Takashi Taniguchi; Kenji Watanabe; Javad Shabani; Davood Shahrjerdi

doi:10.1038/s41467-020-16817-1

Article Versatile construction of van der Waals heterostructures using a dual-function polymeric film

Zhujun Huang ; Abdullah Alharbi ; William Mayer ; Edoardo Cuniberto ; Takashi Taniguchi (National Institute for Materials Science) ; Kenji Watanabe (National Institute for Materials Science) ; Javad Shabani ; Davood Shahrjerdi

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Zhujun Huang, Abdullah Alharbi, William Mayer, Edoardo Cuniberto, Takashi Taniguchi, Kenji Watanabe, Javad Shabani, Davood Shahrjerdi. Versatile construction of van der Waals heterostructures using a dual-function polymeric film. Nature Communications. 2020, 11 (1), 3029. https://doi.org/10.1038/s41467-020-16817-1

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Proliferation of van der Waals (vdW) heterostructures formed by stacking lay- ered materials can accelerate scientific and technological advances in nano- electronics. Here, we report a scalable strategy for building high-quality vdW heterostructures. Our method relies on efficient interface engineering of the exfoliation substrate using a sub-5 nm poly(vinyl alcohol) coating. Our method has three main features that distinguish it from existing techniques. First is the remarkable consistency of its exfoliation process in increasing the yield (20 times) and in producing ultra-large (>10,000 μm2) monolayer graphene flakes. Second is the applicability of its layer transfer process to a variety of layered materials without the use of a specialized stamp—a feature useful for generalizing the assembly process of layered materials. Third is its ability for successful layer transfer of flakes even after long-term storage of the exfolia- tion substrate. We illustrate the capability of our technique by demonstrating vdW graphene devices with peak carrier mobility of 200,000 and 800,000 cm2V−1s−1 at room temperature and 9 K, respectively. The simplicity and versatility of our strategy may open doors for the automated fabrication of vdW heterostructures.

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