An ambipolar transistor based on a monolayer WS₂ using lithium ions injection

Abstract

Ambipolar field-effect transistor (FET) devices based on two-dimensional (2D) materials have been attracted much attention due to potential applications in integrated circuits, flexible electronics and optical sensors. However, it is difficult to tune Fermi level between conduction and valence bands using a traditional SiO2 as dielectric layer. Here, we employed the lithium-ion conductive glass ceramic (LICGC) as the back-gate electrode in a monolayer WS2 FET. The effective accumulation and dissipation of Li+ ions in the interface induce a wide tune of Fermi level in the conducting channel by electron and hole doping, which show an ambipolar transport characteristics with threshold voltages at 0.9 V and −1.3 V, respectively. Our results provide an opportunity for fabricating ultra-thin ambipolar FET based on 2D materials.

Automatic Prediction of Metal–Oxide–Semiconductor Field‐Effect Transistor Threshold Voltage Using Machine Learning Algorithm

“…V th of 2D FET was extracted by the CC method. [35][36][37] The ML input data, composed of only an I D dataset, do not include the information of the corresponding V G range. Therefore, real V th as an output of the ML model causes the overfitting when ML model learns the input data.…”

Lithium-Ion Glass Gating of HgTe Nanocrystal Film with Designed Light-Matter Coupling

“…In this perspective, new materials compatible with this series of constraints must be identified. For a long time, the battery field was using solid electrolytes, and their potential for field-effect transistors has been investigated for 2D materials [ 34 , 35 , 36 , 37 ] and superconductor-based [ 38 ] FETs, but they remain unused for NC-based FETs. Here, we explore the potential of this strategy to design a FET based on HgTe NCs [ 39 ], presenting an absorption in the extended short-wave infrared.…”

Full control of solid-state electrolytes for electrostatic gating

“…A handful of experiments on transistors indicate that conductive glass-ceramics containing alkali ions, Li + or Na + , are promising candidates for electrostatic gating [45][46][47][48][49][50][51] (we are not referring here to experiments where the glass-ceramics are used as a source for ion intercalation [52][53][54] ).…”

“…Back-gated devices employing glass-ceramic substrates, in combination with graphene or transition-metal dichalcogenide (TMD) semiconducting monolayers, were shown to exhibit ambipolar transport 46,47,49 and to operate as lightemitting transistors. 48 There are, however, troublesome inconsistencies between results reported by different groups.…”

“…48 There are, however, troublesome inconsistencies between results reported by different groups. 45,[47][48][49][50][51] A crucial one is the value of the geometrical gate capacitance of conducting glass-ceramic gates, ranging from 1-2 µF/cm 2 to more than 100 µF/cm 2 in different reports 47,50,51 (i.e., from 50 times smaller to 2-3 times larger than the geometrical capacitance of commonly used ionic liquids). The situation is especially problematic for electron accumulation, with maximum reported densities ranging from ∼ 5 × 10 12 cm −250,51 to 5-6 × 10 14 cm −247 in different systems, a spread that cannot be accounted for by the difference in quantum capacitance of the gated materials, and with multiple experiments showing behavior different from that expected from a field-effect transistor (FET).…”