Field-effect transistors made from solution-grown two-dimensional tellurene

By Yixiu Wang, G. Qiu, Ruoxing Wang, Shouyuan Huang, Qingxiao Wang, Yuanyue Liu, Yuchen Du, William A. Goddard III, Moon J. Kim, Xianfan Xu and 2 more. 2017

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The reliable production of two-dimensional (2D) crystals is essential for the development of new technologies based on 2D materials. However, current synthesis methods suffer from a variety of drawbacks, including limitations in crystal size and stability. Here, we report the fabrication of large-area, high-quality 2D tellurium (tellurene) using a substrate-free solution process. Our approach can create crystals with process-tunable thickness, from a monolayer to tens of nanometres, and with lateral sizes of up to 100 µm. The chiral-chain van der Waals structure of tellurene gives rise to strong in-plane anisotropic properties and large thickness-dependent shifts in Raman vibrational modes, which is not observed in other 2D layered materials. We also fabricate tellurene field-effect transistors, which exhibit air-stable performance at room temperature for over two months, on/off ratios on the order of 106, and field-effect mobilities of about 700 cm2 V−1 s−1. Furthermore, by scaling down the channel length and integrating with high-k dielectrics, transistors with a significant on-state current density of 1 A mm−1 are demonstrated.A substrate-free solution process can create large-area two-dimensional tellurium crystals, which can be used to build field-effect transistors that exhibit air-stable performance at room temperature for over two months and high on-state current densities of 1 A mm–1.

Subfields: Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/64f82a7a7e9452c0f96fe694c0d29dcd1544c906