High-Speed Planar GaAs Nanowire Arrays with fmax > 75 GHz by Wafer-Scale Bottom-up Growth - Nano Letters (ACS Publications) Xiuling Li" />bility transistors (HEMTs) with DC and RF performance surpassing those for all field-effect transistors (FETs) with VLS NWs, carbon nanotubes (CNTs), or graphene channels in-plane with the substrate. For a planar GaAs NW array-based HEMT with 150 nm gate length and 2 V drain bias, the on/off ratio (ION/IOFF), cutoff frequency (fT), and maximum oscillation frequency (fmax) are 104, 33, and 75 GHz, respectively. By characterizing more than 100 devices on a 1.5 脳 1.5 cm2 chip, we prove chip-level electrical uniformity of the planar NW array-based HEMTs and verify the feasibility of using this bottom-up planar NW technology for post-Si large-scale nanoelectronics." />